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1
Walpole, W. R. "Beam-column joints". Bulletin of the New Zealand Society for Earthquake Engineering 18, n.º 4 (31 de diciembre de 1985): 369–80. http://dx.doi.org/10.5459/bnzsee.18.4.369-380.
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Vimal Arokiaraj, G. y G. Elangovan. "A Study on Self-Consolidate Concrete in Experimental Reinforced-Concrete Beam Column Structures with Alccofine and Steel Fiber". Advances in Civil Engineering 2022 (31 de octubre de 2022): 1–19. http://dx.doi.org/10.1155/2022/7874066.
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This paper discusses the concept of self-consolidating concrete mix with Alccofine-1203, superplasticizer, viscosity modification agent, crimped steel fiber on the RC beam column joint. Totally, eight reinforced-concrete (RC) column joints with M25 grade concrete were considered in this study. Out of eight RC beam column joints, two beam column joints served as Alccofine, two beam column joint specimens served as Alccofine 5%, two beam column joint specimens served as Alccofine-10%, and two beam column joint specimens served as Alccofine-15%. All the RC beam column joint specimens were tested under the compression until failure in the loading frame of 2000 kN capacity. The test results of Alccofine-10% showed the higher loading capacity than that of Alccofine-5% and Alccofine-15% in self-consolidating concrete RC beam column joints. The percentage of superplasticizer, viscosity modification agent, and crimped steel fiber is maintained. Nonlinear finite element analysis (FEA) to analyse the beam column joint through nonlinear finite element modelling (NLFEM) and the modelling results were compared from the experimental results. The results obtained through ANSYS modelling show good agreement with the experimented results. The deflection ductility of experimental results shows 1.57, and the predicted deflection ductility shows 1.59 in beam column joint with Alccofine-10%. ANSYS software is validated as appropriate software to predict the study parameters of self-consolidation concrete in beam column joints.
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Hwang, Hyeon-Jong y Chang-Soo Kim. "Simplified Plastic Hinge Model for Reinforced Concrete Beam–Column Joints with Eccentric Beams". Applied Sciences 11, n.º 3 (1 de febrero de 2021): 1303. http://dx.doi.org/10.3390/app11031303.
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In nonlinear analysis for performance-based design of reinforced concrete moment frames, a plastic hinge spring element is predominantly used in order to simply and accurately describe the inelastic behavior of beam–column joints, including strength degradation. Although current design codes and guidelines provide various beam–column joint models, the focus is on concentric beam–column joints. Therefore, more studies are required for eccentric beam–column joints, which are also common in practice. In the present study, to consider the effect of beam eccentricity on the behavior of beam–column joints, a simplified plastic hinge model was proposed using the effective joint width of current design codes. The proposed model was compared to the cyclic loading test results of beam–column joints with/without beam eccentricity. The comparison showed that the simplified plastic hinge model with the effective joint width of NZS 3101-2006 or Eurocode 8 is considered acceptable for design purpose.
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Gombosuren, Dagvabazar y Takeshi Maki. "Prediction of Joint Shear Deformation Index of RC Beam–Column Joints". Buildings 10, n.º 10 (5 de octubre de 2020): 176. http://dx.doi.org/10.3390/buildings10100176.
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In the analysis of reinforced concrete (RC) buildings, beam–column joints are regarded as rigid nodes. In fact, joint deformation may make a significant difference in the lateral response of RC buildings if joints are not properly designed and detailed. To consider joint flexibility, several types of joint models have been proposed. However, these models require complicated computations, consequently making them challenging to apply in engineering practice. This paper proposed a simple approach for predicting the contribution of the joint deformation to the total deformation of RC interior beam–column joints under critical structural deformations. To develop such a simple and accurate approach, experimental and analytical studies were performed on RC interior beam–column joints. In this study, eight half-scale joint specimens were tested under reversed cyclic loading, and 39 full–scale FE models were constructed, varying the selected key parameters. The experimental and analytical results showed that the “joint shear” is a useful index for the beam–column joints with high shear stress levels of vj>1.7 fc′ but is unsuitable for defining the failure of beam–column joints with medium or low shear stress levels of vj≈1.25–1.7fc′ and vj≈1.0fc′. Based on the results, three equations were developed to predict the joint shear deformation index (SDI) of RC interior beam–column connections corresponding to three different types of failure (i.e., joint failure before beam yielding, joint failure after beam yielding, and beam flexural failure). SDI predictions of the proposed equations correlate well with 50 test results of beam–column joints available from the literature.
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Zhao, Huang Juan, Hai Tao Fan y Zhi Xin Wang. "Nonlinear Finite Element Analysis of Interior Beam-Column Joints in Reinforced Concrete Frame". Applied Mechanics and Materials 166-169 (mayo de 2012): 1062–66. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.1062.
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By using finite element analysis software ABAQUS, the mechanical behavior of the beam-column joints is studied through analyzing 8 interior beam-column joints in RC frame. Meanwhile, the factors which can have effects on the behavior of the beam-column joints are also obtained. The reasonable parameters such as material constitutive, the boundary conditions and mesh types will directly affect the accuracy of finite element analysis results. The mechanical behavior of the beam-column joint in RC frame is decided by concrete strength and volumetric percentage of stirrups. With the increase of concrete strength and volumetric percentage of stirrups in joint core, the shear capacity of interior beam-column joints in RC frame is improved.
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R., Balamuralikrishnan y Saravanan J. "Finite Element Analysis of Beam – Column Joints Reinforced with GFRP Reinforcements". Civil Engineering Journal 5, n.º 12 (1 de diciembre de 2019): 2708–26. http://dx.doi.org/10.28991/cej-2019-03091443.
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Glass Fibre Reinforcement Polymer (GFRP) reinforcements are currently used as internal reinforcements for all flexural members due to their resistance to corrosion, high strength to weight ratios, the ability to handle easily and better fatigue performance under repeated loading conditions. Further, these GFRP reinforcements prove to be the better alternative to conventional reinforcements. The design methodology for flexural components has already come in the form of codal specifications. But the design code has not been specified for beam-column joints reinforced internally with GFRP reinforcements. The present study is aimed to assess the behaviour of exterior beam-column joint reinforced internally with GFRP reinforcements numerically using the ABAQUS software for different properties of materials, loading and support conditions. The mechanical properties of these reinforcements are well documented and are utilized for modelling analysis. Although plenty of literature is available for predicting the joint shear strength of beam-column joints reinforced with conventional reinforcements numerically, but no such study is carried for GFRP reinforced beam-columns joints. As an attempt, modelling of beam-column joint with steel and with GFRP rebars is carried out using ABAQUS software. The behaviour of joints under monotonically increasing static and cyclic load conditions. Interpretation of all analytical findings with results obtained from experiments. The analysis and design of beam-column joints reinforced with GFRP reinforcements are carried out by strut and tie model. Strut and Tie models are based on the models for the steel reinforced beam-column joints. The resulting strut and tie model developed for the GFRP reinforced beam-column joints predicts joint shear strength. Joint shear strength values obtained from the experiments are compared with the analytical results for both the beam-column joints reinforced with steel and GFRP reinforcements. The joint shear strength predicted by the analytical tool ABAQUS is also validated with experimental results.
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Guo, Rui, Dan Yang, Bin Jia y Deyun Tang. "Seismic Response of GFRP-RC Interior Beam-to-Column Joints under Cyclic Static Loads". Buildings 12, n.º 11 (16 de noviembre de 2022): 1987. http://dx.doi.org/10.3390/buildings12111987.
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A total of nine specimens were constructed and tested under cyclic loads to investigate the differences in seismic behavior between glass fiber-reinforced polymer (GFRP)-reinforced concrete (RC) joints and RC beam-to-column joints. The experimental parameters included stirrup ratios, axial pressure ratios and concrete strength of the beam-to-column joints. The cyclic loading test results showed that the GFRP-RC beam-to-column joints can withstand significantly high lateral deformations without exhibiting brittle failure. Moreover, the RC beam-to-column joint exhibited significantly higher energy dissipation and residual displacement than the GFRP-RC beam-to-column joint by 50% and 60%, respectively. Finally, a shear capacity calculation method for the core zone of this kind of joint was proposed, which agreed well with the experimental results.
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Guo, Ting, Na Yang, Huichun Yan y Fan Bai. "Experimental study of moment carrying behavior of typical Tibetan timber beam-column joints". Advances in Structural Engineering 24, n.º 11 (18 de marzo de 2021): 2402–12. http://dx.doi.org/10.1177/13694332211001503.
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This study aimed to investigate the moment carrying behavior of typical Tibetan timber beam-column joints under monotonic vertical static load and also evaluate the influence of length ratio of Gongmu to beam (LRGB) and dowels layout on the structural performance of the joint. Six full-scale specimens were fabricated with same construction but different Gongmu length and dowels position. The moment carrying performance of beam-column joints in terms of failure mode, moment resistance, and rotational stiffness of joints were obtained via monotonic loading tests. Test results indicated that all joints are characterized by compressive failure perpendicular to grain of Ludou. Additionally, it was found that greater LRGB leads to greater initial rotational stiffness and maximum moment of the joint by an increase of restraint length for beam end; however, offsetting dowels toward column resulted smaller stiffness and ultimate bending moment of joints, particularly, offsetting Beam-Gongmu dowels toward column changed the moment-rotation curve pattern of the beam-column joint, accompanied by a hardening stiffness at last phase. Furthermore, a simplified trilinear model was proposed to represent the moment-rotation relationship of the typical Tibetan timber beam-column joint.
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Wardi, Syafri y Sulaiman Yusuf Ardiansyah. "Perbandingan Ketentuan dan Analisis Detailing Hubungan Balok-Kolom Berdasarkan SNI 2847:2013 dan SNI 2847:2019". Borneo Engineering : Jurnal Teknik Sipil 1, n.º 2 (30 de agosto de 2022): 159–70. http://dx.doi.org/10.35334/be.v1i2.2430.
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Recent earthquakes in Indonesia have caused significant damage to many buildings, especially because the beam-column joints did not satisfy the detailing requirements for the seismic-resistant building. SNI 2847: 2013 is an Indonesian code for designing concrete buildings, which has been updated to SNI 2847:2019, consist of several new provisions related to detailing beam-column joints. This study discusses the comparison of detailing requirements based on the two codes and compares the analysis of detailing of the beam-column joints in a focused building, a five-story building which represents a medium rise building. The comparison of detailing requirements for beam-column joint according to SNI 2847:2013 and SNI 2847:2019 showed that SNI 2847:2019 has several new requirements related to the height of the joint, standard hooks in an exterior joint, headed bar, and transverse reinforcement in the joint. Then, comparing the results of analysis of detailing of the beam column joints in the focused building showed that there is no different on the detailing results of the joints according to SNI 2847:2013 dan SNI 2847:2019.
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Purnomo, Joko, V. Octaviani, P. K. Chiaulina y Jimmy Chandra. "Evaluation of a Macro Lump Plasticity Model for Reinforced Concrete Beam-Column Joint under Cyclic Loading". Civil Engineering Dimension 22, n.º 2 (6 de octubre de 2020): 82–93. http://dx.doi.org/10.9744/ced.22.2.81-92.
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Lateral deformations of reinforced concrete (RC) frames under extreme seismic excitation are highly affected by the stiffness of their beam-column joints. Numerous models have been proposed to simulate the responses of RC beam-column joint under cyclic loading. Development of RC beam-column joint model based on macro modeling using spring elements becomes more popular because of its considerably simple application for seismic performance evaluation purposes. In this study, a simple modification to previously developed macro-spring element-based model for RC beam-column joint is done and is used to simulate the behavior of seven external and five internal RC joints under cyclic loading in SAP2000. The model consists of several spring elements to define column, beam, joint, and bond-slip responses according to its individual moment-rotation relationships. Overall, the analysis results show that the modified model can simulate well the cyclic behavior of RC beam-column joints when are compared to previously available experimental results
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Zheng, Wenzhong, Dehong Wang y Yanzhong Ju. "Performance of Reinforced Reactive Powder Concrete Beam-Column Joints under Cyclic Loads". Advances in Civil Engineering 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/3914815.
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An experimental research was carried out to investigate the seismic performance and shear strength of reactive powder concrete interior beam-column joints subjected to reverse cyclic loads. Four beam-column joint specimens were cast and tested in the investigation. The failure characteristics, deformational properties, ductility, and energy dissipation of reinforced reactive powder concrete interior beam-column joints were analyzed in this paper. The shear strength of joints was calculated according to the GB5001-2010 and ACI 318-14. The results shows that reactive powder concrete beam-column joints have a higher shear-cracking strength and shear carrying capacity and strength degradation and rigidity degradation are not notable. Additionally, the use of RPC for beam-column joints can reduce the congestion of stirrups in joints core. The shear force in the RPC joint is mainly carried by the diagonal strut mechanism; the design expression of ACI 318-14 can be used for calculating the shear strength of RPC joints, which has a safety margin of 22%∼38% in this test.
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Dhanabal, P., P. Narendra Reddy y K. S. Sushmitha. "Analytical and Experimental Study on Flexural Behavior of Beam-column Joint with Addition of Polypropylene Fibers". Journal of Modern Materials 9, n.º 1 (2 de junio de 2022): 26–35. http://dx.doi.org/10.21467/jmm.9.1.26-35.
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Key scope of this research is evaluation of actions of beam to column joints under the impact load acting on it. The beam-column joints, a common area between frame beams and columns. It is the most critical zone to ensure the global response of such momentary resistance structures. Several approaches have been attempted over the years by many civil engineers and practitioners to improve the deficiently thorough joint in between beam and column. The highest bending moment and shear forces in the framed structures are at the junction area. As a result, that joint between beam and column is one of a collapse zone. Joint in outer is more important among the beam-column joints. The effect may be caused by a weight falling on the design object or possibly falling off the design object and hitting the hard surface. In this work, an emphasis has been made to understand the joint vulnerability against impact loads and its behavior is analyzed using the ANSYS software. From this experimental program observed that, impact resistance in RCC beam to column joints can be improved by improving stiffness by added polypropylene fibers and energy absorption can also be improved.
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Li, Yunan, Xian Dong, Zhan Wang, Jiajun Li y Ke Qin. "Research on Mechanical Properties of Angle Beam-column Joint with Gusset plate". E3S Web of Conferences 233 (2021): 03031. http://dx.doi.org/10.1051/e3sconf/202123303031.
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There is wide use of beam-column joint with gusset plate angle connection in engineering, however, the mechanical properties of these joints are still lack of complete theoretical and experimental research. This kind of joint is often simplified as an articulated connection or other types of connections in the design. In this paper, experimental study and finite element analysis are carried out to study the flexural behavior of the beam-column joint with gusset plate angle connection. The finite element analysis is used to analyze the differences between the beam-column joint with gusset plate and other joints. The moments-rotation curves and failure modes of the three kinds of beam-column joints were obtained by the static test which were carried out. A more reasonable design of beam-column joint with angle plate of gusset plate is put forward through the research of this paper: the deformation of the column flange is restricted after adding the stiffener, which can avoid the premature yield of the column flange and making the joint have good energy dissipation capacity.
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Desta, Negasa, Kabtamu Getachew y Daba Geresu. "Numerical Investigation of Textile Reinforced Cement Structural Stay-in-Place Formwork Designed as Beam-Column Joint Shear Reinforcement". Advances in Civil Engineering 2022 (30 de junio de 2022): 1–24. http://dx.doi.org/10.1155/2022/4644433.
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This study investigates the feasibility and structural performance of textile reinforced cement (TRC) stay-in-place (SiP) formwork designed as shear reinforcement for beam-column joints under monotonic loading through the nonlinear finite element package ABAQUS. This was achieved by conducting numerical analysis on 24 beam-column joints using different parameters that affect the joints’ performance, including column axial load ratio, concrete compressive strength, beam tensile reinforcement ratio, joint shear reinforcement ratio, and thickness of TRC. The models were first calibrated to the results obtained from the experimental program of previous studies. The start of the yielding behavior of the composite beam-column (73 kN) corresponds well to the conventional beam-column joint (72 kN). A similar correlation can be observed at the ultimate load with only a 3.7% difference, 84 kN in the case of the composite beam-column joint and 81 kN in the case of the conventional beam-column joint. The findings of this investigation showed that a beam-column with a full steel stirrup and TRC SiP formwork as shear reinforcement at the joint exhibits similar yielding behavior, such that TRC SiP formwork can replace the full steel stirrup at the joint, as proved by comparison analysis. Furthermore, the numerical analysis results due to the effect of these essential parameters on the structural performance of the beam-column with TRC SiP formwork at the joint were also discussed.
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James, Jerison Scariah y Margrette Mary James. "Effect of Fibres on Beam Column Joint Failure". Applied Mechanics and Materials 857 (noviembre de 2016): 59–64. http://dx.doi.org/10.4028/www.scientific.net/amm.857.59.
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Concrete is one of the most resourceful and environmental friendly building materials. It can be cast to fit any structural shape from a cylindrical water storage tank to a rectangular beam, slabs and column in a high-rise building. In RC buildings, portions of columns that are common to beams at their intersections are called beam column joints. Beam-column joints have a crucial role in the structural integrity of the buildings. Review of literature indicates that numerous studies were conducted in the past to study the behaviour of beam-column joints with normal concrete. However, those recommendations are not intended for the fibre reinforced concrete. Some indicates that this material is an alternative to the confining reinforcement in the joint region. So the comparative study of the performance of different fibres in beam column joint has a greater importance and relevance in the field of RCC framed structures. This thesis aims to study the behaviour of beam column joint by evaluating the performance of fibre reinforced concrete. The incorporation of fibres in beam column joint is analysed in this study. The use of different types of fibres such as steel and polypropylene are evaluated.
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Tang, Qian Zhen, Wan Zhen Wang, Xin Zhao, Hang Lei Shi y Chen Peng. "Fracture Mechanism of Joints of Steel Box Column-H Steel Beam and Performance Study of Joints Strengthened with Haunches". Applied Mechanics and Materials 204-208 (octubre de 2012): 3119–22. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.3119.
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Fracture test was performed on conventional joint of steel box column-H steel beam. The test results indicate that the conventional joints brittle fracture at butt weld of beam flanges. The performance of joints of steel box column-H steel beam strengthened with haunches is numerically simulated based on an ellipsoidal fracture model considering of welding residual stress and welding defects. The simulated results show that, for the joints of box column-H beam strengthened with haunches, the plastic rotation of could reach 0.03rad and the bearing capacity increased by 20% compared with that of the conventional joint.
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Leon, Roberto y James O. Jirsa. "Bidirectional Loading of R.C. Beam-Column Joints". Earthquake Spectra 2, n.º 3 (mayo de 1986): 537–64. http://dx.doi.org/10.1193/1.1585397.
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Fourteen reinforced concrete beam-column joint subassemblages were tested to investigate the effects of load history, beam reinforcement size, beam geometry and floor slabs on joint behavior under cyclic bidirectional load reversals. The full-scale specimens were loaded biaxially to simulate the worst loading condition on the joints of a multi-story ductile moment-resisting frame. The tests showed that biaxial effects can have a significant impact on joint behavior due to the deterioration of column strength, that the beam and slab geometry can significantly affect the joint shear response, and that bond conditions and column-to-beam flexural capacity ratio control the design of such subassemblages.
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Nie, Shao Feng, Tian Hua Zhou, Xiang Bin Liu y Xiu Mei Wang. "Study on Mechanical Behavior of Concrete-Filled Square Tubular Column and Bolt-Weld Steel Beam Joints with Reduced Beam Section". Advanced Materials Research 163-167 (diciembre de 2010): 620–23. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.620.
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The nonlinear FEM models of concrete-filled square tubular column with internal diaphragms and steel beams with reduced beam section bolt-weld joints, involving geometric, materials and contact nonlinear, were established. The 3D models of beam-to-column joints with internal diaphragms by 3D solid elements are founded. The bearing capacity behavior of joints under the monotonic loading are analyzed, including P-Δ curves, the stresses distribution of beam, the dissipating energy ability and destruction form. The analysis results show that the initial stiffness of joint with reduced beam section is close to that of non-reduced beam section joint. The bearing capacities of joints with reduced beam section are lower a little than that of non-reduced beam section joint. The plastic hinge in the joint with reduced beam section is removed to the reduced beam region.
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HU, Ju-Yun y Won-Kee HONG. "Steel beam–column joint with discontinuous vertical reinforcing bars". JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 23, n.º 4 (21 de abril de 2017): 440–54. http://dx.doi.org/10.3846/13923730.2016.1210217.
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The authors have previously proposed steel beam–column connections for precast concrete frames. The steel–concrete composite frames combined the advantages of the fast assembly of steel and the low cost of concrete structures. However, when not enough space is available at column–beam joints, steel sections from beams cannot be connected with column brackets. To address this issue, this paper explores the strategy of disconnecting some vertical reinforcing bars at the joints by connecting vertical steel reinforcements to steel plates placed above and below column steels, to provide a load transfer path. Loads from re-bars are transferred to steel plates, column steels, and back to steel plates and re-bars below the column steels. This strategy provided space for beam–column joints of composite frames. Extensive experiments were performed to verify load transfer from re-bars to steel plates above joints and from the steel plates to re-bars below the joint. The flexural load-bearing capacity of a column with a total of 24 vertical re-bars was compared to that of columns with discontinuous re-bars at the joints; the number of discontinuous re-bars at the joint used in the column specimens tested was 0 (0.0%), 4 (16.7%), 12 (50.0%), and 20 (83.3%).
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Zhang, Xizhi, Jiashu Hao, Dongchao Duan, Shengbo Xu, Shaohua Zhang y Houxin Yu. "Experimental study on bolted and anchored beam-to-column joints of prefabricated concrete frames". Advances in Structural Engineering 23, n.º 2 (29 de agosto de 2019): 374–87. http://dx.doi.org/10.1177/1369433219872432.
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A new type of beam-to-column joint used in prefabricated concrete frames was proposed in this study. In this joint, the longitudinal bars at the top of the beam are anchored to the column using straight thread sleeves, and the bars at the bottom are welded to the steel fastener that is bolted to the column. Cyclic loading tests of three specimens, namely, two beam–column joints of this type and a cast-in-place beam–column joint, were conducted to study the seismic behavior and feasibility of this type of joint. The difference between the two prefabricated joints is the shape of the holes on the end plate. Failure modes of the specimens were observed and analyzed. The hysteretic curves, bearing capacities, stiffness degeneration, ductility, and energy-dissipating capacities of the specimens were compared and studied. Test results indicated that all beam–column joints exhibited beam hinge failure. No slippage was observed between the concrete and horizontal plates of the steel fasteners used in the new type of joint. The bearing capacity and initial stiffness of both prefabricated specimens compared with the cast-in-place ones were increased. The steel fastener could increase the distance between the plastic hinge and the side surface of the column while enlarging the length of the plastic hinge. The trend of energy dissipation and stiffness degeneration of the specimens were similar, and the ductility coefficient ranged from 2.7 to 4.91. The displacement angles of the joints exceeded 1/50 before the failure of the specimens. The mechanical behavior of both prefabricated joints was similar, but the joint with U-shaped holes on the end plate was convenient to create.
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Wang, Kun, Shi Yun Xu y Hui Hui Luo. "Nonlinear Analysis of Shear Performance for Joint of Steel Reinforced Concrete Beam and Angle-Steel Concrete Column". Applied Mechanics and Materials 256-259 (diciembre de 2012): 674–79. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.674.
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Based on the simulated results of joint of SRC beam and RC column (steel reinforced concrete beam and reinforced concrete column) with steel anchor, an analytical research on failure models and shear performance of three types of joints is conducted, which is composed of SRC beam and RC column, of SRC beam and column (steel reinforced concrete beam and column) and of SRC beam and ASC column (steel reinforced concrete beam and angle-steel concrete column). Then the parameters analysis for joint of SRC beam and ASC column is carried out, and the design formula of shear capacity for joint of SRC beam and ASC column is given on account of a great number of calculated and statistic results.
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Zhang, Min, Zhengrong Xue, Yihu Chen, Dan Lu, Wen Qin y Wei Yu. "Hysteresis Performance and Restoring-Force Model of Precast Concrete Ring-Lap Beam-Column Joints". Buildings 13, n.º 2 (18 de enero de 2023): 286. http://dx.doi.org/10.3390/buildings13020286.
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In order to study the restoring-force characteristics of precast concrete ring-lap beam-column joints, three precast concrete ring-lap beam-column joint specimens and one cast-in-place concrete beam-column joint specimen were designed and fabricated, and low-circumferential repeated loading tests were conducted. The results show that the bearing capacity of the ring-lap beam-column joint is higher than that of the cast-in-place beam-column joint, and with the increase in the lap length, the bearing capacity, ductility, and energy dissipation capacity of the ring-lap beam-column joint increase significantly, and the local damage is also mitigated. Based on the test results and the existing restoring-force model theory, a trifold restoring-force model is proposed for precast concrete ring-lap beam-column joints considering the effect of lap length. The proposed restoring-force model is consistent with the hysteresis curve of the assembled column, which indicates that the proposed restoring-force model can better reflect the influence of the lap length on the hysteresis characteristics, and can provide a reference for the structural elastic–plastic analysis and engineering application of the precast concrete ring-lap beam-column joint. The proposed restoring-force model can better reflect the influence of lap length on the hysteretic properties, which can provide a reference for the structural elastoplastic analysis and engineering application of this precast concrete ring-lap beam-column joint.
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Wiles, Lilliana, Jonathan Pethybridge y Timothy John Sullivan. "Accounting for the Flexibility of Beam-Column Joints within New Zealand Steel Moment-Resisting Frame Structures". Key Engineering Materials 763 (febrero de 2018): 182–88. http://dx.doi.org/10.4028/www.scientific.net/kem.763.182.
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In New Zealand there currently appears to be no simplified, effective method of analysing the rotational stiffness of beam-column joints in steel moment resisting frame structures. Many practicing engineers use simplified design tables to detail beam-column joints for strength requirements, without accounting for the flexibility of joints. This tends to underestimate the flexibility of structures and hence the drifts they undergo in wind and earthquake events. To permit improved consideration of beam-column joint stiffness in a simplified manner, this work adapts the European component method to develop a series of tables that practitioners could look up to quickly identify beam-column joint stiffness values. The potential use for such stiffness values is highlighted by examining the impact of joint flexibility on the drifts expected in a 4-storey steel MRF subject to 1 in 500 year return period earthquake loading.
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Li, Bing y H. Y. Grace Chua. "Rapid Repair of Earthquake Damaged RC Interior Beam-Wide Column Joints and Beam-Wall Joints Using FRP Composites". Key Engineering Materials 400-402 (octubre de 2008): 491–99. http://dx.doi.org/10.4028/www.scientific.net/kem.400-402.491.
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This paper studies the seismic performance of FRP-strengthened RC interior non-seismically detailed beam-wide column and beam-wall joints after limited seismic damage. Four eccentric and concentric beam-wide column joints and two beam-wall joints, initially damaged in a previous study, were repaired and tested under constant axial loads (0.1 and 0.35 ) and lateral cyclic loading. The rapid repair technique developed, aimed to restore the original strength and to provide minimum drift capacity. The repair schemes were characterized by the use of : 1) epoxy injection and polymer modified cementitious mortar to seal the cracks and replace spalled concrete and 2) glass (GFRP) and carbon (CFRP) sheets to enhance the joint performance. The FRP sheets were effectively prevented against possible debonding through the use of fiber anchors. Comparison between responses of specimens before and after repair clearly indicated reasonable restoration in strength, drift capacity, stiffness and cumulative energy dissipation capacity. All specimens failed with delamination of FRP sheets at beam-column joint interfaces. The rapid repair technique developed in this study is recommended for mass upgrading or repair of earthquake damaged beam-column joints.
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Cao, Chen, Shan-suo Zheng, Wei-bing Hu, Li-guo Dong y Xiao-rui Liu. "Seismic Behavior of Reinforced Concrete Frame Joints in Coastal Atmosphere". Advances in Civil Engineering 2020 (10 de marzo de 2020): 1–15. http://dx.doi.org/10.1155/2020/1636539.
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The study aims to research the influence of salt fog corrosion cycles on seismic performance of reinforced concrete (RC) frame beam-column joints in coastal atmosphere. Based on low cyclic loading tests of six RC frame beam-column joint specimens, this study analyses the failure patterns, hysteresis loops, load carrying capacity, displacement, backbone curves, and energy dissipation capacity of corrosion-damaged RC frame beam-column joints. The effect of salt fog corrosion cycles and axial compression ratios are tested repeatedly. The results show that with the same level of axial compression of the frame joint specimens, as the increase of salt fog cycles, the strength, ductility, energy dissipation, bearing capacity, and deformation capacity of joints degenerated to different degrees． When the corrosion level is the same, the stiffness degradation appeared to be more apparent as the increase of axial compression ratio. Then, the behavior degeneration rule of the RC frame beam-column joints is analyzed and formed according to the results of the test; the degeneration restoring force models of corroded RC frame beam-column joints is formed and verified based on Clough’s three-line degenerate restoring force model and the introduction to cyclic degeneration index. The results show that the restoring force model can better describe the hysteresis characteristics of the beam-column joints of corroded RC frames. The research is a theoretical reference for the seismic analysis of the RC frame structure affected by coastal atmospheric environment.
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Wang, Ying, Miao Li, Jin Hua Xu y He Fan. "Effect of Axial Compression Ratio and Concrete Strength on Seismic Performance of Concrete Filled Steel Tube Beam-Column Joints". Applied Mechanics and Materials 488-489 (enero de 2014): 704–7. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.704.
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Based on finite element analysis o f concrete filled steel tube beam-column joints under the single axial compression ratio and concrete strength, further research was done to analyze the seismic performance of concrete filled steel tube beam-column joints under different axial compression ratio and concrete strength. Beam-column joint which is connected by bolts with welding extended steel sheets at the beam root was analyzed. The results show that with the increase of axial compression ratio, strength and stiffness degradation of the joint accelerated gradually. Axial compression ratio at 0.3, 0.4 are appropriate values for joints specimen, load-displacement hysteresis curve of joint specimens is relatively plump and shows good seismic performance. Chance of concrete strength also had effect on seismic performance of joint specimen, but in contrast it is not so obviously.
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Park, Sangjoon y Khalid M. Mosalam. "Simulation of Reinforced Concrete Frames with Nonductile Beam-Column Joints". Earthquake Spectra 29, n.º 1 (febrero de 2013): 233–57. http://dx.doi.org/10.1193/1.4000100.
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The accurate prediction of shear strength and flexibility of beam-column joints without transverse reinforcement is essential to assess the seismic performance of nonductile reinforced concrete (RC) buildings characterized by having such unreinforced beam-column joints. In this study, a multilinear backbone curve to represent the moment-rotation relationship of an unreinforced corner beam-column joint is proposed. The modeling parameters of the backbone curve are estimated based on experimental results of four corner joint specimens recently tested by the authors. Furthermore, the proposed backbone curve is modified to be applicable to interior and roof beam-column joints. These backbone curves are validated by accurate reproduction of the force-drift responses of the four corner joint specimens and eight other exterior and interior joint specimens from literature. Using these backbone curves, nonlinear dynamic analyses are performed on three hypothetical building frames. The analytical results demonstrate the importance of joint flexibility for seismic assessment of nonductile RC buildings.
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Osman, S. A., M. Y. M. Yatim, Asma Nabila Abd. Kader y Mohd Razmi Mohd Amit. "Seismic Resistance Evaluation of Reinforced Concrete (RC) Exterior Beam-Column Joints with and without GFRP under Quasi-static Lateral Cyclic Loading by Adopting Experimental Analysis". Jurnal Kejuruteraan 34, n.º 6 (30 de noviembre de 2022): 1175–84. http://dx.doi.org/10.17576/jkukm-2022-34(6)-17.
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The beam-column joint is an important component of Reinforced Concrete (RC) structures because its design and detailing are critical to the safety of these structures under seismic loading. In recent decades, structural behaviour of beam-column joints has been widely explored. To better understand the behaviour of beam-column joints, researchers have conducted experiments and provided analytical and experimental solutions. The seismic behaviour of beam-column joints with and without Glass Fibre Reinforced Polymer (GFRP) when subjected to quasi-static lateral cyclic loading was compared in this research using two specimens. The first specimen is a typical RC exterior beam-column joint without GFRP while the second specimen is RC exterior beam-column joint that is pre-installed with Glass Fibre Reinforced Polymer (GFRP) using Near-Surface Mounted (NSM) technique. The specimens were evaluated to a drift of 2.0% under quasi-static lateral cyclic loading. There were two cycles in each drift. Based on the amplitudes of both specimens, it can be seen that the amplitude of beam-column joint with GFRP is lower than the beam-column joint without GFRP. This suggests that the presence of GFRP reduces the intensity of the loading. This study also discusses the energy dissipation and equivalent viscous damping on both specimens. During the experiment, each crack, void between the concrete, and spalling of concrete fragments were carefully monitored. Visual observation during the experiment shows that severe cracking is evident on the inner part of the structure in both specimens. Therefore, a new location of GFRP-NSM would be suggested for a future experiment.
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Li, Zhenbao, Yashuang Liu, Hua Ma, Qianqian Wang y Zhenyun Tang. "Seismic Performance of Full-Scale Joints Composed by Concrete-Filled Steel Tube Column and Reinforced Concrete Beam with Steel Plate-Stud Connections". Advances in Civil Engineering 2019 (18 de marzo de 2019): 1–17. http://dx.doi.org/10.1155/2019/5476909.
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A concrete-filled steel tube (CFST) column has the advantages of high bearing capacity, high stiffness, and good ductility, while reinforced concrete (RC) structure systems are familiar to engineers. The combinational usage of CFST and RC components is playing an important role in contemporary projects. However, existing CFST column-RC beam joints are either too complex or have insufficient stiffness at the interface, so their practical engineering application has been limited. In this study, the results of a practical engineering project were used to develop two kinds of CFST column-RC beam joints that are connected by vertical or U-shaped steel plates and studs. The seismic performance of full-scale column-beam joints with a shear span ratio of 4 was examined when they were subjected to a low-cyclic reversed loading test. The results showed a plump load-displacement curve for the CFST column-RC beam joint connected by steel plates and studs, and the connection performance satisfied the building code. The beam showed a bending failure mode similar to that of traditional RC joints. The failure area was mainly concentrated outside the steel plate, and the plastic hinge moved outward from the ends of the beam. When the calculated cross section was set at the ends of the beam, the bending capacity of joints with the vertical or U-shaped steel plates and studs increased compared to the RC joint. However, when the calculated cross section was set to the failure area, the capacity was similar to that of the RC joint. The proposed joints showed increases in the energy dissipation, average energy dissipation coefficient, and ductility coefficient compared to the RC joint.
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Kumar, C. Vivek, Patam Manisha y Pooja Sadula. "Behavior of Monotonic Loading for Glass Fibre based High Performance Concrete in External Beam-Column Joint using ANSYS. Analysis". E3S Web of Conferences 184 (2020): 01088. http://dx.doi.org/10.1051/e3sconf/202018401088.
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Strength, ductility of structures differ primarily on appropriate detailing of. beam column joints need a vital role in the structural reliability of the structures given with appropriate stiffness and ultimate strength to maintain the loads transmitted from beam and column. Beam column joints defined as the reinforced concrete buildings, in which portion of columns and beams having their intersections. Although these forces greater than these are affected during earthquakes, joints are relentlessly damaged. As far as earthquake is affected, research on beam-column joint is essential. In HPC, these materials with admixtures are meticulously designated and proportioned to produce very high early, ultimate strengths and durability away from conventional concrete. The admixtures like flyash, silicafume, ground granulated blast furnace slag (GGBFS), which are combined with its strength and durability and boost its marketability as a natural friendly product. The most important purpose of the present study is to investigate the performance of high performance reinforced beam-column joints (replacement of cement with GGBFS). Ground granulated blast furnace GGBFS is employed as a partial replacement of cement with glass fibre and super plasticizer is applied to accomplish required workability. In this study, a evaluation of control specimen and specimen of beam column joint with 7.5% GGBFS and 0.3% glass fibre replacement intended as per IS 456:2000 and IS 13920:2016. Also, to ascertain the performance of beam-column joints subjected to monotonic loading for high performance concrete employing with Ground Granulated Blast Furnace Slag (GGBFS) and glass fibre.
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Chen, Hai Bin, Nan Ge y Yan Pu Zhang. "Seismic Performance on Reinforced Concrete Frame Joints of Open Set Corner Floor". Advanced Materials Research 594-597 (noviembre de 2012): 1766–70. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.1766.
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Quasi-static analysis of in-situ reinforced concrete frame joints is done by using finite element software ADINA. The calculation results of the ordinary beam-column joints and the surrounding floor located Corner joints are compared. It is shown that near the beam ribbed slab reinforcement stress significantly increases with the loading displacement increasing, indicating that the floor enhance the flexural capacity of beam. On the conditions of no influence the joint strength, floor set corner can be partially weakened the capacity of the beam flexural, and reinforcement of beams yield significantly in advance. When the beam reinforcement yield, the column of concrete cracks have also been reduced. Meanwhile, the beam-end and column-end plastic hinge appears increase the time interval, so that the joints are closer to the characteristics of the beam hinge mechanisms by the earthquake damage.
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Xu, Ying y Bi Qin Dong. "An Industrialized Multi-Layer Precast Concrete Frame Building with Middle-Joint Beams and Columns". Advanced Materials Research 163-167 (diciembre de 2010): 1849–53. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.1849.
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An industrialized multi-layer precast concrete building with middle-joint beams and columns frame system has been developed by China VANKE CO., LTD. The building is the first industrialized multi-layer precast concrete building for experimental purpose in China. A middle-joint beams and columns method has been utilized with beams and columns split in the middle place. The whole frame structure is then integrated into a unity through precast beams, precast columns, and reliable cast-in-place column-column and beam-beam joints. This paper presents the key points and difficulties during the building design process, introduces the structural design of column-column and beam-beam joints, and analyses the advantages and weaknesses of middle-joint beams and columns frame system.
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Shi, Haiou, Jinxia Zhao, Fangmu Chen, Junjin Lin y Jianhe Xie. "Mechanical behaviour of precast prestressed reinforced concrete beam–column joints in elevated station platforms subjected to vertical cyclic loading". REVIEWS ON ADVANCED MATERIALS SCIENCE 60, n.º 1 (1 de enero de 2021): 818–38. http://dx.doi.org/10.1515/rams-2021-0065.
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Abstract Precast-reinforced concrete (RC) structures in urban rail transit projects can provide many advantages over their cast-in-place counterparts. However, lessons learned from past earthquakes show that beam-column joints may be a critical point of these structures and can overestimate the mechanical performance under vertical seismic loadings if not properly understood. This paper presents unbonded and bonded prestressed precast RC beam-column joints for elevated station platforms. Prestressed steel strands are used to provide joints with self-centring capacity. The performance of the proposed joints under vertical cyclic loadings is experimentally investigated and compared to that of monolithic joints in this study. The obtained results demonstrate the good properties of the proposed precast joints in terms of bearing capacity, energy dissipation capacity and ductility control. A comparison with a conventional monolithic beam-column joint indicates the better performance against earthquakes of the proposed precast prestressed joints, and the precast joint with symmetric prestressed steel strands in the top and bottom of the beam exhibits better flexural stiffness and energy dissipation capacity.
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Bayhan, B., J. P. Moehle, S. Yavari, K. J. Elwood, S. H. Lin, C. L. Wu y S. J. Hwang. "Seismic Response of a Concrete Frame with Weak Beam-Column Joints". Earthquake Spectra 31, n.º 1 (febrero de 2015): 293–315. http://dx.doi.org/10.1193/071811eqs179m.
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A reduced-scale, planar, two-story by two-bay reinforced concrete frame with weak beam-column joints was subjected to earthquake simulations on a shaking table. The beam-column joints did not contain transverse reinforcement, as is typical in older construction designed without attention to detail for ductile response. A series of linear and nonlinear analytical models of the frame were developed in accordance with American Society of Civil Engineers standards and subjected to the input base motions. The goodness of fit between analytical and measured results depended on the details of the analytical model. Reasonably accurate reproduction of the measured response was obtained only by modeling the inelastic responses of both columns and beam-column joints. The results confirm the importance of modeling nonlinear joint behavior in older concrete buildings with deficient beam-column joints.
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Xiang, Ping, ZH Deng, YS Su, HP Wang y YF Wan. "Experimental investigation on joints between steel-reinforced concrete T-shaped column and reinforced concrete beam under bidirectional low-cyclic reversed loading". Advances in Structural Engineering 20, n.º 3 (29 de julio de 2016): 446–60. http://dx.doi.org/10.1177/1369433216653841.
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Steel-reinforced concrete T-shaped column-beam structure system has superiorities of both steel-reinforced structure and special-shaped column structure. This research focuses on steel-reinforced concrete T-shaped column-beam joint design and experimentally investigates seismic behaviors of the proposed joints. Pseudo-static tests are carried out on three steel-reinforced concrete T-shaped column-reinforced concrete beam joints and one reinforced concrete T-shaped column-reinforced concrete beam joint. The experiments were conducted under bidirectional low-cyclic reversed loading to simulate realistic loading conditions under earthquake. Hysteresis loops of all the specimens, including load–deflection, moment–rotation, and load–shear deformation loops, are plotted for the evaluation of seismic reaction. The working index, ductility coefficient, and equivalent viscous-damping coefficient are calculated for comparisons. Meanwhile, the ductility, capacity of energy dissipation, stiffness degradation, and the function of steel reinforcement in resisting shear force in the joint core area are intensively studied. Based on experimental results, this research analyzes shear-resistant capacity and the inner force transmission in these joints. It is found that the steel-reinforced concrete T-shaped column-reinforced concrete beam joint performs well under seismic conditions; moreover, shear-resistant capacity, ductility, and reliability are satisfactory. Conclusions derived from this research are useful for engineering practice.
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Zhang, Ji Chao, Nan Li y Lei Ji. "Experimental Study on Seismic Behavior of Pre-Cast Concrete Structure with Cast-In Situ Integral Beam-Column Joint Sub-Assemblage". Applied Mechanics and Materials 71-78 (julio de 2011): 506–9. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.506.
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Based on the need of housing industrialization, using full-scale models, this paper investigated the seismic behavior of pre-cast concrete beam-column subassemblies with cast-in-situ monolithic joints under low-cycle reversed loading. The failure pattern, hysteretic characteristic, skeleton curve, ductility and energy dissipation were also analyzed. The result indicated that beam-column joints with longitudinal bars welded at the bottom of beams can meet the requirements of “strong column-weak beam, stronger joint”.
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Tiwary, Aditya Kumar, Sandeep Singh, Jasgurpreet Singh Chohan, Raman Kumar, Shubham Sharma, Somnath Chattopadhyaya, Farid Abed y Mislav Stepinac. "Behavior of RC Beam–Column Joints Strengthened with Modified Reinforcement Techniques". Sustainability 14, n.º 3 (8 de febrero de 2022): 1918. http://dx.doi.org/10.3390/su14031918.
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Using a significant number of transverse hoops in the joint’s core is one recognized way for achieving the requirements of strength, stiffness, and ductility under dynamic loading in a column joint. The shear capacity of a joint is influenced by the concrete’s compressive strength, the anchoring of longitudinal beam reinforcement, the number of stirrups in the joint, and the junction’s aspect ratio. Seismic motion on the beam may produce shear capacity and bond breaking in the joint, causing the joint to fracture. Furthermore, due to inadequate joint design and details, the entire structure is jeopardized. In this study, the specimens were divided into two groups for corner and interior beam–column joints based on the joint reinforcement detailing. The controlled specimen has joint detailing as per IS 456:2000, and the strengthened specimen has additional diagonal cross bars (modified reinforcement technique) at the joints detailed as per IS 456:200. The displacement time history curve, load-displacement response curves, load-displacement hysteretic curve, and load cycle vs. shear stress were used to compare the results of the controlled and strengthened specimens. The findings show that adding diagonal cross bars (modified reinforcing techniques) to beam–column joints exposed to cyclic loads enhances their performance. The inclusion of a diagonal cross bar increased the stiffness of the joint by giving an additional mechanism for shear transfer and ductility, as well as greater strength with minimum cracks.
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Yang, Chen y Xiancheng Li. "Seismic Performance Analysis of Fabricated Concrete Beam-Column Joints Based on Intelligent Finite Element Analysis". Journal of Electrical and Computer Engineering 2022 (24 de mayo de 2022): 1–11. http://dx.doi.org/10.1155/2022/3659479.
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In order to improve the seismic performance analysis effect of prefabricated concrete beam-column joints, this article uses intelligent finite element analysis technology to analyze the seismic performance of prefabricated concrete beam-column joints. Moreover, this article conducts in-depth research on the shear bearing capacity of the plastic hinge area so as to improve the accuracy of the calculation of the shear bearing capacity of the plastic hinge area. In addition, this article conducts finite element analysis of integral frame joints, uses finite element software to carry out numerical simulation of frame joints, and compares and analyzes the experimental results in the literature. Further, this article proposes an improvement of a prefabricated frame joint, performs finite element analysis on it, and compares and analyzes the numerical simulation results of concrete joints. The analysis results show that the finite element analysis model proposed in this article has high accuracy in the seismic performance analysis of prefabricated concrete beam-column joints, which meets the actual needs of the seismic performance analysis of modern prefabricated concrete beam-column joints.
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Gao, Fei, Zhiqiang Tang, Shilong Mei, Biao Hu, Shitao Huang y Junbo Chen. "Seismic behavior of exteriorbeam–column joints with high-performance steel rebar: Experimental and numerical investigations". Advances in Structural Engineering 24, n.º 1 (27 de julio de 2020): 90–106. http://dx.doi.org/10.1177/1369433220942870.
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Three full-scale exterior beam–column joints with anti-seismic steel reinforcement were tested under quasi-static cyclic loading and column axial compressive loading. The test variables were column axial load ratio and joint core hoop reinforcement ratio. Experimental results, including failure mode, hysteretic curve, ductility, energy dissipation, stiffness degradation, and decoupling of deformations, were presented and analyzed. The tests revealed that the anti-seismic rebar resulted in good joint seismic performance and that column axial load ratio and joint core hoop reinforcement ratio impose limited influence of joint performance when the joint failed in beam flexural failure. The calibrated finite element models developed based on OpenSees were then used to simulate the behavior of joint specimens. Parametric studies via finite element modeling were performed to study the influence of various parameters on the performance of beam–column joints.
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Emami, Ebrahim, Ali Kheyroddin y Mohhamad Kazem Sharbatdar. "Experimental and analytical investigations of reinforced concrete beam-column joints retrofitted by single haunch". Advances in Structural Engineering 23, n.º 15 (22 de junio de 2020): 3171–84. http://dx.doi.org/10.1177/1369433220922493.
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Recently, the single haunch with specifications such as less invasive and architectural consistency, and easy to practice have been adopted as one of the considered retrofitting options for deficient reinforced concrete beam-column joints. In this article, by analytical evaluation, the influence parameters such as haunch to beam stiffness ratio, haunch inclination angles, and mounted position were investigated. Analytical equations were also proposed for haunch to beam stiffness ratio in terms of both shear interaction between haunch and beam-column members and reduction of joint shear demand. Moreover, five exterior beam-column joint sub-assemblies were fabricated afterwards four of those retrofitted by various cross-sectional area of single steel haunch. Then, all of these beam-column joints and remaining one (as-built joint) were experimentally subjected to cyclic loading. To validate the analytical results, the experimental responses in four limit states including first diagonal core crack in as-built joint, drift ratio 2%, the first diagonal core crack in all the joints, and ultimate state (peak load) were provided for comparison. Also, by definition of an index as vulnerability index in fraction ratio of available joint shear force to joint shear strength predicted by international codes, the obtained vulnerability index of experimental responses were compared to analytical results.
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Zhang, Yang, Wei Ma, Xin Li y Kai Li. "Experimental Research on Seismic Behavior of Haunched Concrete Beam–Column Joint Based on the Bolt Connection". Sustainability 14, n.º 23 (24 de noviembre de 2022): 15644. http://dx.doi.org/10.3390/su142315644.
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Studying the seismic performance of assembled beam–column joints is essential for the development of assembled frame structures. In this paper, a novel dry connection beam–column joint with a high degree of modularity and a simple structure is proposed and tested using a pseudostatic test. The joint is composed of a precast concrete beam with a steel axillary plate at the end and a precast concrete column connected by long bolts. By analyzing the characteristics of the hysteresis curve, skeleton curve, and stiffness degradation curve, we were able to investigate the seismic performance of this novel new joint under low circumferential reciprocating load as well as the impact of bolts of various strength grades on the joint’s seismic performance. The results illustrated the robust overall bearing performance of the newly assembled beam–column joint. However, when connected with common bolts, the joint deforms more, exhibits good ductility, clearly displays semi-rigid characteristics, and performs better in terms of energy dissipation. This contrasts with connecting with low-strength bolts, which cause the joint to deform little and have poor energy dissipation capacity. The prefabricated columns and beams remain undamaged, making it possible to quickly repair the assembled building structure after an earthquake; however, the joints are harmed due to the bending and fracture of the connection bolts. It has been suggested that researchers add damping energy dissipation devices to the new joint to increase its energy dissipation capacity and control the joint’s overall deformation because the joint’s energy dissipation capacity is insufficient under the low circumferential reciprocating load.
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Araby, M. Zardan, Samsul Rizal, Abdullah, Mochammad Afifuddin y Muttaqin Hasan. "Deformation Capacity of RC Beam-Column Joints Strengthened with Ferrocement". Sustainability 14, n.º 8 (7 de abril de 2022): 4398. http://dx.doi.org/10.3390/su14084398.
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Beam-column joints constructed in the pre-seismic building code do not provide transverse reinforcement and good reinforcement detailing within the region. These cause the occurrence of brittle shear failure, which is one of the factors affecting the number of reinforced concrete (RC) moment resistance building structures collapsing during an earthquake. Therefore, in this study a brittle beam-column joint with a non-seismic building code was designed and strengthened by a ferrocement. Four layers of wire mesh with a diameter of 1 mm and a mesh size of 25.4 mm were installed on both sides of the beam-column joint and cement mortar was cast on it. As a comparison, a ductile beam-column joint was also designed following the current building code, which considers seismic effects. The test results by applying reversed cyclic loading at the beam tip showed that strengthening using ferrocement prevents crack propagation, increasing the deformation capacity, ductility, stiffness, and energy dissipation of beam column joint which are higher than those of the beam-column joint which is designed following the current building code. However, the strengthening does not improve the load carrying capacity significantly.
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Pan, Jian Rong, Zhan Wang, Lin Qiang Zheng y Zheng Ting Yang. "Finite Element Analysis of Beam-Column Connection with Cantilever Beam Splicing". Advanced Materials Research 838-841 (noviembre de 2013): 540–44. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.540.
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Beam-column connection with cantilever beam bolted-splicing is also known as the joint of column-tree moment-resisting frame. The study is still relatively small for the semi-rigid behavior and rotational stiffness of the joint. This paper deal with four specimens of the joints with cantilever beam splicing and four specimens of the welded joints by using three dimensional finite element model analysis. The strain, stress, yield and ultimate loads, yield and ultimate deformations had been compared between the joint with cantilever beam splicing and the welded joint. The analysis results show that, when the splicing area of the joint with cantilever beam splicing was designed more strongly, the stress distribution, the load-displacement curves in elastic working stage, and the initial rotational stiffness are good agreement between the joint with cantilever beam splicing and the welded joint. The hysteresis curves of the joint with cantilever beam splicing were inverse S-shaped, indicating that there was greater slipping deformation because of bolt splicing. The welded joint had no slipping phenomenon.
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Urbonas, Kestutis y Alfonsas Daniūnas. "COMPONENT METHOD EXTENSION TO STEEL BEAM‐TO‐BEAM AND BEAM‐TO‐COLUMN KNEE JOINTS UNDER BENDING AND AXIAL FORCES". JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 11, n.º 3 (30 de septiembre de 2005): 217–24. http://dx.doi.org/10.3846/13923730.2005.9636353.
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This paper presents an analysis of semi‐rigid beam‐to‐beam end‐plate bolted and beam‐to‐column end‐plate bolted knee joints that are subjected to bending and tension or compression axial force. Usually the influence of axial force on joint rigidity is neglected. According to EC3, the axial load, which is less than 10 % of plastic resistance of the connected member under axial force, may be disregarded in the design of joint. Actually the level of axial forces in joints of structures may be significant and has a significant influence on joint rigidity. One of the most popular practical method permitting the determination of rigidity and strength of joint is the so‐called component method. The extension of the component method for evaluating the influence of bending moment and axial force on the rigidity and strength of the joint are presented in the paper. The numerical results of calculations of rigidity and strength of beam-to-beam and beam-to-column knee joints are presented in this paper as well.
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Ahmad, Naveed, Muhammad Rizwan, Babar Ilyas, Sida Hussain, Muhammad Usman Khan, Hamna Shakeel y Muhammad Ejaz Ahmad. "Nonlinear Modeling of RC Substandard Beam–Column Joints for Building Response Analysis in Support of Seismic Risk Assessment and Loss Estimation". Buildings 12, n.º 10 (20 de octubre de 2022): 1758. http://dx.doi.org/10.3390/buildings12101758.
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The paper discusses how joint damage and deterioration affect the seismic response of existing reinforced concrete frames with sub-standard beam–column joints. The available simplified modeling techniques are critically reviewed to propose a robust, yet computationally efficient, technique for simulating the nonlinear behavior of substandard beam–column joints. Improvements over the existing models include the simulation of the cyclic deterioration of joint stiffness and strength, as well as pinching in the hysteretic response, implemented considering a deteriorating hysteretic rule. A fiber-section forced-based inelastic beam–column element is developed, considering improved material models and fixed-end rotation due to bond failure, rebars-slip, and inelastic extension, to simulate the deteriorating cyclic behavior of existing pre-cracked beam–column members. For the assessment of frames with substandard exterior beam–column joints, a nonlinear model for the exterior joint is developed and validated through a full-scale quasi-static cyclic test performed on a substandard T-joint connection. The proposed model allows considering structural performance in risk assessment while accounting for true inelastic mechanisms at the joints. An assessment of a five-story RC frame revealed that the activation of the joint shear mechanism increases the chord rotation demand on the connecting beam members by up to 85%, with increases of up to 62% (mean drift) and 89% (mean + 1.std.) on the lower floors when determining the inter-story drift demand, and the collapse probability of structures subjected to design base ground motions increased from 4.20% to 29.20%.
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Wu, Tao, Xi Liu, Guo Hua Xing y Bo Quan Liu. "Shear Behavior of Interior Joints with Different Depth Beams in RC Frame Structures". Advanced Materials Research 217-218 (marzo de 2011): 1504–9. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.1504.
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Six specimens of interior joints with different depth beams were tested under reversed cyclic loading. The failure characteristics and shear force versus shear angle skeleton curves of interior joints are analyzed. Based on the experimental study, an analytical model for equivalent joint core of abnormal joint under the combined action of axial load and shear is established, and the shear stress versus shear angle curves of equivalent joint core of tested specimens was calculated by using modified compression field theory (MCFT).Test results indicated that the first crack appeared in the minor core (determined by the low beam and the top column), and the final failure appeared in the large core (determined by the high beam and the bottom column). The critical crack load was quite nearly with the ultimate load of abnormal joints, and seismic behavior of beam-column joint sub-assemblage was poorer than that of ordinary joints. Good agreement between experimental results and prediction results is achieved.
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Dang, Cong Thuat y Ngoc Hieu Dinh. "Experimental Study on the Structural Performance of Beam-Column Joints in Old Buildings without Designed Shear Reinforcement under Earthquake". Materials Science Forum 902 (julio de 2017): 33–40. http://dx.doi.org/10.4028/www.scientific.net/msf.902.33.
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Old reinforced concrete buildings constructed around 1980’s in many developing countries have been designed against mainly gravity load. Beam-column joints in these buildings contain slightly or no shear reinforcement inside the panel zones due to the construction convenience, and are vulnerable to shear failure in beam-column joints under the action of earthquake loads, especially for the exterior beam-column joints. This experimental study aimed to investigate the seismic performance of five half-scale exterior beam-column joints simulating the joints in existing reinforced-concrete buildings with non-shear hoop details. The test results showed that the structural performances of the beam-column joints under earthquake including failure mode, load-drift ratio relationship, shear strain of the joints and energy dissipation are strongly affected by the amount of longitudinal reinforcing bars of beams.
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Sathish Kumar, Veerappan, Namasivayam Ganesan, Pookattu Vattarambath Indira, Gunasekaran Murali y Nikolai Ivanovich Vatin. "Behaviour of Hybrid Fibre-Reinforced Ternary Blend Geopolymer Concrete Beam-Column Joints under Reverse Cyclic Loading". Polymers 14, n.º 11 (31 de mayo de 2022): 2239. http://dx.doi.org/10.3390/polym14112239.
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Beam–column joints are extremely vulnerable to lateral and vertical loads in reinforced concrete (RC) structures. This insufficiency in joint performance can lead to the failure of the whole structure in the event of unforeseen seismic and wind loads. This experimental work was conducted to study the behaviour of ternary blend geopolymer concrete (TGPC) beam-column joints with the addition of hybrid fibres, viz., steel and polypropylene fibres, under reverse cyclic loads. Nine RC beam-column joints were prepared and tested under reverse cyclic loading to recreate the conditions during an earthquake. M55 grade TGPC was designed and used in this present study. The primary parameters studied in this experimental investigation were the volume fractions of steel fibres (0.5% and 1.0%) and polypropylene fibres, viz., 0.1 to 0.25%, with an increment of 0.05%. In this study, the properties of hybrid fibre-reinforced ternary blend geopolymer concrete (HTGPC) beam-column joints, such as their ductility, energy absorption capacity, initial crack load and peak load carrying capacity, were investigated. The test results imply that the hybridisation of fibres effectively enhances the joint performance of TGPC. Also, an effort was made to compare the shear strength of HTGPC beam-column connections with existing equations from the literature. As the available models did not match the actual test results, a method was performed to obtain the shear strength of HTGPC beam-column connections. The developed equation was found to compare convincingly with the experimental test results.
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Aleksander, Kozłowski y Kukla Damian. "Experimental Tests of Steel Unstiffened Double Side Joints with Flush and Extended End Plate". Archives of Civil Engineering 65, n.º 4 (1 de diciembre de 2019): 127–54. http://dx.doi.org/10.2478/ace-2019-0051.
Texto completoResumen
AbstractExperimental tests of steel unstiffened double side bolted end-plate joints have been presented. The main aim of the conducted tests was to check the behavior of joints in an accidental situation and possibility of creating secondary mechanism, i.e. catenary action in the scenario of column loss. Two types of end plate joints were tested: flush end-plate (FP) and extended end-plate (EP) with different thickness and different number of bolt rows in each. The tests were carried out on an isolated cross beam-column-beam type system until joint failure. During tests the available moment resistance and rotation capacity of bending joints and also values of tension forces in the beam were determined. The joints with extended end-plate have demonstrated higher bending and rotational capacity than flush end-plate. Significant deformation of column flanges, web and end plate were observed. The fracture of bolts was the failure mode of joints. Obtained results of axial force values in beam exceeded standard requirement what confirmed that the joints with unstiffened web column, flush or extended end-plate possess the ability of development the catenary action.
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Masi, Angelo, Giuseppe Santarsiero, Antonello Mossucca y Domenico Nigro. "Influence of Axial Load on the Seismic Behavior of RC Beam-Column Joints with Wide Beam". Applied Mechanics and Materials 508 (enero de 2014): 208–14. http://dx.doi.org/10.4028/www.scientific.net/amm.508.208.
Texto completoResumen
Beam-column joints can play a key role on the seismic behavior of reinforced concrete buildings. Until now studies and experimental investigations on this topic have been mainly focused on beam-column joints with stiff beams, i.e. beams with height larger than the thickness of the adjacent floor slab. However, especially in the European residential building stock, frame structures are often equipped with wide - therefore rather flexible - beams. However, not many studies have been devoted so far to this type of connection, therefore an experimental investigation on full scale beam-column joints with wide beam was planned at the University of Basilicata and is currently in progress. In the present paper the main results of two cyclic tests are reported and discussed specifically analyzing the role of the axial load applied to the column on the joint performances and damage mechanisms. Test results highlights that the axial load value has a significant influence of on deformation capacity and ductility behavior.