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1
Liu, Hongtao, Qiushi Yan, and Xiuli Du. "Seismic performance comparison between precast beam joints and cast-in-place beam joints." Advances in Structural Engineering 20, no. 9 (October 20, 2016): 1299–314. http://dx.doi.org/10.1177/1369433216674952.
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Precast reinforced concrete structures are widely used due to many constructional advantages such as faster construction speed, lower construction cost, being environmentally friendly, higher strength, and so on. To study the seismic performance of precast reinforced concrete structures, tests on beam-to-column joints of precast reinforced concrete structures were conducted under low reversed cyclic loading. In total, four joint specimens were produced in this study, including two precast joints and two cast-in-place joints. In addition to the comparison between different types of joints, the axial compression ratio of column was adopted as the main variable in this study. Analysis was carried out on the basis of the observed joint failure mode and relationships derived from the test data such as hysteresis curves, skeleton curves, stiffness degradation curves, energy dissipation capacities, and sleeve joint strain curves. Despite the closeness of energy dissipation capacity between the precast joints and the cast-in-place joints, they had different failure modes. Precast joints feature a relatively concentrated crack distribution in which the limited number of cracks was distributed throughout the plastic zone of the beam. Cast-in-place joints feature more evenly distributed cracks in the plastic zone, especially at the later stage of the loading. The steel slippage of the precast concrete joints was found influenced by the axial compression ratio. Through this study, it is concluded that seismic resistance capacity of precast concrete joint needs to be considered in design and construction and the grouting sleeve splice could be kept away from the hinge zones when precast concrete structures were used in regions of high seismicity. The results in this study can provide a theoretical basis for seismic design of precast reinforced concrete structures, which in turn can promote the application of precast reinforced concrete structures.
2
Wei, Chun Ming, Hui Su, Qiang Zhao, and Chun Li Bi. "Bonding Mechanism of Horizontal Construction Joints." Advanced Materials Research 368-373 (October 2011): 1264–67. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.1264.
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The quality of construction joint is significantly influenced by the precision in the concrete placement. In order to obtain the mechanical properties of horizontal construction joints surface, a comprehensive research was conducted. The research focused on the tensile capacity and seismic behavior of construction joints surface. According the tests failure characteristics, four kinds of cracking model of construction joints zone were formed. Test results indicated that bond materials could increase displacement ductility more than 10％～30％. And the clamping action provided by bond materials was so good that failure didn’t occur at the construction joint itself, but in the concrete adjacent to it. Axial compressive force is advantageous for the shear capacity of construction joint interface.
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Semko, Pavlo, Serhii Skliarenko, and Volodymyr Semko. "Concrete Filled Tubular Elements Joints Investigation." International Journal of Engineering & Technology 7, no. 3.2 (June 20, 2018): 494. http://dx.doi.org/10.14419/ijet.v7i3.2.14578.
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The stress-strain state and the bearing capacity of the dismountable joints of concrete filled tubular elements are investigated. The methods of calculation and constructive solutions of concrete filled tubular elements with joints are analyzed. Five new types of dismountable joints are proposed. Experimental studies of concrete filled tubular elements have been carried out. It was determined that the most effective for compression was a joint with a steel coupling and for bending the most effective was a joint with longitudinal ribs. The numerical modeling algorithm is presented; results are verified using experimental tests. A method for constructing N-M boundary dependences for concrete filled tubular structures is proposed. Bearing capacity diagrams for concrete filled tubular elements and their joints have been constructed. The costs of the materials needed to perform the joint as the example of a real construction for similar loads are analyzed.
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Zhijun, Cheng, Li Wenpei, Fan Pengxian, and Zhang Ning. "Experimental Study on the Impermeability of Concrete Construction Joints with Different Geometric Shapes." Open Civil Engineering Journal 7, no. 1 (August 19, 2013): 109–15. http://dx.doi.org/10.2174/1874149520130708005.
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Concrete construction joints are widely used in underground structures. The structure's impermeability is generally considered as its weak point. In this paper, influence of geometric shape and contact slurry on the impermeability of construction joints has been researched by a model test. Three joint types, including flat joints, arc joints and trapezoid joints, were constructed and tested. The tested construction joints were cast by half individually with a determined time interval to simulate the practical construction process. Each joint type has twelve samples, divided averagely into two groups, one of which was smeared by slurry on the contacts and the other was not. Test result shows that the structural type of construction joints has a great influence on the impermeability of samples. Trapezoid joints have the best impermeability, arc joints take the second place and flat joints are the worst. The contact slurry has a considerable unfavorable effect on the impermeability of construction joints.
5
Kim, Haena, Byungkyu Moon, Xinyu Hu, Hosin (David) Lee, Gum-Sung Ryu, Kyung-Taek Koh, Changbin Joh, Byung-Suk Kim, and Brian Keierleber. "Construction and Performance Monitoring of Innovative Ultra-High-Performance Concrete Bridge." Infrastructures 6, no. 9 (August 30, 2021): 121. http://dx.doi.org/10.3390/infrastructures6090121.
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The application of Ultra-High-Performance Concrete (UHPC) materials in rehabilitating bridges and constructing primary bridge components is increasing rapidly across the world because of their superior strength and durability characteristics when compared to regular concretes. However, there have been few new bridges constructed using UHPC materials with regular formworks, ready-mix trucks, and construction equipment. This paper presents a comprehensive report encompassing the design, construction, and performance monitoring of a new bridge constructed in Iowa using a unique UHPC technology that includes steel fibers of two different lengths embedded in the concrete. By using optimized lengths of steel fibers, both the tensile strength and the toughness were increased. The UHPC material was produced with local cement and aggregates in the US using typical ready-mix concrete equipment. This paper discusses the experience gained from the design and construction process including mix design, batching, delivery of steel fibers to the ready-mix concrete batch unit, and post-tensioning of precast slabs at the jobsite. For four years after construction, the joints of the bridge decks were monitored using strain sensors mounted on both sides of the deck joints. The strain values were quite similar between the two sides of each joint, indicating a good load transfer between precast bridge girders. A bridge was successfully constructed using a unique UHPC technology incorporating two different lengths of steel fibers and utilizing local cement and aggregates and a ready-mix truck, and has been performing satisfactorily with a good load transfer across post-tensioned precast girder joints.
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Deineko, Andrei V., Valentina A. Kurochkina, Irina Yu Yakovleva, and Aleksandr N. Starostin. "Design of reinforced concrete slabs subject to the construction joints." Vestnik MGSU, no. 9 (September 2019): 1106–20. http://dx.doi.org/10.22227/1997-0935.2019.9.1106-1120.
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Introduction. When erecting monolithic reinforced concrete floor slabs, a necessity of construction joints arises. The construction joints are the areas of structural weakening. The construction practice shows that the compliance with the correct technology of the construction joint arrangement is not a sufficient condition to ensure the strength balance of reinforced concrete floor slabs. As a result, the stress-deformation state calculated on the assumption of the concrete slab solidity deviates from the actual state. The relevance of the task is determined by the fact that the conformity of design and actual characteristics of the in-situ reinforced concrete structures as a whole depends on the correct calculations of construction joints.
Materials and methods. The problem of implementing the construction joints in the monolithic floor slabs was considered by way of example of a residential building under construction. In the course of construction, pre-construction land surveys were carried out at the areas of the construction joint arrangement. Calculations of reinforced concrete structures using finite element method (FEM) were also performed.
Results. As a result of the study, the actual deflections of the floor slabs were measured at the areas of the construction joints and FEM calculations were made on the same floor slabs, both those erected at once and those erected in stages subject to the construction joints. The difference between the calculated and actual deflections is conditioned upon the inaccurate conformity between the mathematical model and the real reinforced concrete structure, its erection and maintenance conditions. It should be noted that the deflection of horizontal reinforced concrete structures is only one of the stress-deformation state parameters that can be measured better than the others. It is shown that if the deflection of a real reinforced concrete structure does not correspond with the design estimation, the other stress-deformation state parameters will differ from the design estimation as well.
Conclusions. The influence of joints can be taken into account in the scope of FEM computer-aided calculations with the explicit reproduction of the structure erection by pouring concrete, using engineering approach to the consideration of nonlinearity on the basis of the introducing reduction coefficients to the reinforced concrete effective modulus of elasticity. Solid composition modeling of reinforced concrete provides the best possibilities on taking all sorts of nonlinearity manifestations into consideration.
7
Zhao, Teng Fei, Zhao Bo Meng, and Yong Sheng Zhao. "Experimental Research on Seismic Capacity of the Frame Sandwich Boundary Joint." Applied Mechanics and Materials 405-408 (September 2013): 1974–77. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.1974.
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In the tall building frame structure, the traditional frame joints which are usually constructed with the high strength concrete of the columns bring many difficulties to the construction. The frame joints concreted with beams low grade concrete (named as sandwich joint) is urged intensively by the engineers. The paper introduces the experiment of two full-scale sandwich boundary joints in the middle floor under cyclic load. Based on the test result, the specimens seismic behavior on performance of load-carrying capacity, node deformation, ductility, energy dissipation capacity etc are studied. Through comparison with traditional frame boundary joints, comprehensive seismic performance of sandwich boundary joints does not significantly reduce. The engineering applications of these sandwich frame joints are proved to be feasible, and some suggestions for the engineering application of this joint are proposed.
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Hwang, Yong Ha, Keun Hyeok Yang, Jae Sung Mun, Hyun Sub Yoon, In Hyuk Hwang, and Hye Jin Lee. "Effect of Concrete Types and Construction Joints on Concrete Shear Friction Characteristics." Key Engineering Materials 723 (December 2016): 700–705. http://dx.doi.org/10.4028/www.scientific.net/kem.723.700.
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The present study examined the effect of smooth construction joint and concrete unit weight on the shear friction behavior of concrete. From nine push-off test specimens, shear load-relative slip relationships, shear cracking stress, shear friction strength were measured. Test results showed that the shear cracking stress was hardly affected by the configuration of transverse reinforcement or concrete unit weight. The shear friction strength of monolithic normal-weight concrete was approximately three times higher than that of the companion specimens with construction joint. Meanwhile, the heavyweight concrete joints had a similar shear friction strength to normal-weight concrete ones.
9
Yakovleva, Irina, and Valentina Kurochkina. "Arrangement of construction joints in cast-in-place slabs." E3S Web of Conferences 97 (2019): 04023. http://dx.doi.org/10.1051/e3sconf/20199704023.
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Within latest decades cast-in-place construction of residential houses has been actively developed. Works on erection of cast-in-place frame of the building are normally performed by phases, which results in a necessity to arrange construction joints of concreting. In accordance with regulatory documents, it is allowed to arrange construction joints in any place of the slab, in parallel with its less side. As well, it is necessary to observe the technology for joint arrangement. As practice shows, observing only technology of construction joint arrangement is insufficient to provide for strength properties of cast-in-place reinforced-concrete slabs. This article provides an analysis of actual geodetic pre-construction surveys, design and theoretically-calculated solutions; case study is a multistoried building under construction. On which basis, excessive slab deflections in the places of construction joints, were detected. It is established, that the main reason for deflection occurrence is early removal of slab formwork and installation of supports for temporary supporting. On the basis of obtained findings authors make conclusions regarding compulsory observance of the technology for construction joint arrangement, regarding a necessity to remove formwork according to common standards 70.13330.2012; as well, it is recommended to leave formwork under construction joints until concrete gains 100% of ruggedness.
10
Hao, Yan E., and Yong Qiang Lan. "Analysis on Setting Joints Technology in the Concrete Structure Buildings." Advanced Materials Research 971-973 (June 2014): 2052–56. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.2052.
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If reasonable joint is set in the design and construction of concrete structure buildings in advance as required, it can not only avoid or alleviate structural cracking and guarantee the quality of engineering construction, but also be good to improve the structural integrality and durability and lengthen service life of the buildings. This paper states the main types and functions of joints in the design and construction of reinforced concrete structure buildings. Then the major forms of setting joint technology are analyzed and discussed so as to provide references for relevant engineering technicians.
11
Souliman, Mena I., Ashish Tripathi, Lubinda F. Walubita, and Mayzan M. Isied. "Performance evaluation of jointed plain concrete pavements with sealed and unsealed joints in North Texas." Canadian Journal of Civil Engineering 46, no. 7 (July 2019): 601–8. http://dx.doi.org/10.1139/cjce-2018-0531.
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Joint sealing in jointed plain concrete pavement (JPCP) has been practiced throughout the world for many years as it improves the performance of concrete pavements. The infiltration of water is a common problem in concrete pavements and often increases distresses, such as faulting and pumping. For this reason, sealing the joints can help reduce water infiltration. Additionally, the infiltration of sand and small stones, aggregates, or debris into the joints can also be prevented, consequently reducing joint spalling in concrete pavements. However, it is also reported that joint sealing increases the initial cost of construction, especially if the joints need to be resealed, which leads to some additional costs. In this study, the pavement distress data was collected from the long-term pavement performance (LTPP) database for all the JPCPs sections in North Texas. The study illustrates the relative field performance in terms of spalling, faulting, roughness, and deflections of JPCP sections for both sealed and unsealed LTPP sections of North Texas.
12
Yang, Zhao, and Qing Hai Mei. "Analysis on the Holistic Resistant Behavior of Super High-Rise Structure Affected by the Concrete Strength of the Core of the Joints." Advanced Materials Research 631-632 (January 2013): 747–53. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.747.
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There are some disadvantages in the concrete pouring method of column beam joints of super high-rise structures. If the concrete of joint core use the same strength grade with beams and plates, and pouring with them together, the construction process will be simplified and the construction quality will be easier to ensure. But the concrete strength of joint core is reduced, so whether the resistant behavior of the structure can be able to meet the design requirements is the key problem we focus on. The finite element model of a super high-rise structure was established by MIDAS software, the holistic resistant behavior of the structure was analyzed to study the effect of joint core concrete strength on the whole structure. The study provides the basis for further exploring a more reasonable pouring method of the concrete of the joints.
13
Shchedrolosiev, O., O. Uzlov, and K. Kyrychenko. "IMPROVING CONSTRUCTIVE AND TECHNOLOGICAL CONNECTING JOINTS OF REINFORCED CONCRETE PONTOON WITH A TRANSVERSE DIAPHRAGM AND A METAL TOWER IN A FLOATING COMPOSITE DOCK." Scientific Bulletin Kherson State Maritime Academy 1, no. 22 (2020): 142–52. http://dx.doi.org/10.33815/2313-4763.2020.1.22.142-152.
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The analysis of the known technical decisions in dock construction field, rationalizing production resources at composite docks construction is given. It is established that the available solutions do not specify the recommendations for lowering the metal content in the reinforced concrete pontoon of composite floating docks. As a result of the conducted research, the design of floating composite docks was improved by reducing sets in the reinforced concrete pontoon. The rationality of a pontoon design construction without installation of frames, floors, and beams under towers is substantiated. Technological recommendations for the transverse partitions installation between the inner boards in 4 spaces, i.e. in 3 meters in contrast to the classical design in which the distance between the partitions is 1.5 meters, were described. The analysis of the design features of the reinforced concrete pontoon connecting joints with the transverse diaphragm and the metal tower of the floating composite dock is carried out, the difficulties that arise are described. The design and technological recommendations for the construction of the reinforced concrete pontoon joints with the transverse diaphragm and the metal tower have been developed. The floating dock construction sequence and technological operations ensuring concrete’s strength, water tightness and frost resistance at intersection joints are described. Solutions that increase the local adhesion of concrete to cross-shaped parts and prevent its exfoliation have been developed. The traditional scheme of the composite dock construction and a structural joint of a metal tower with a reinforced concrete pontoon is given. The composite dock construction scheme and the construction scheme of the joints of the reinforced concrete pontoon with the transverse diaphragm and the metal tower, which are designed for the construction of floating composite docks with reduced metal content in the pontoon, have been improved.
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Айменов, Ж. Т., А. Ж. Айменов, and И. З. Кашкинбаев. "CONSTRUCTION AND TECHNICAL PROPERTIES OF FINE-GRAIN STRESS CONCRETE JOINTS." Вестник ГГНТУ. Технические науки, no. 4(22) (December 25, 2020): 36–43. http://dx.doi.org/10.34708/gstou.2020.19.91.005.
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В работе приведены результаты исследований по проектированию составов мелкозернистых бетонов на напрягающем цементе для замоноличивания стыков труб. Задачей исследования явилось получение материала заделки стыков с заданными физико-механическими свойствами. Для этого были определены оптимальные составы мелкозернистых бетонов на напрягающих цементах и условия получения материала, удовлетворяющего требованиям, предъявляемым к бетонам заделки стыков бетонных труб, закрытых водоподающих систем. Исследования проводились на экспериментальных установках. Установлено, что мелкозернистые бетоны на основе напрягающегося цемента обладают особо плотной структурой, обусловливающей их высокую непроницаемость, также повышенную трещиностойкость благодаря наличию в них самонапряжения. Высокая непроницаемость обусловлена его слабо пористой структурой, округлой изометричной формой пор, отсутствием неплотностней между заполнителем и цементом. Исследованиями установлено, что путем изменения водоцементного отношения, расхода напрягающего цемента и песка можно регулировать структуру напрягающего бетона. The paper presents the results of studies on the design of compositions of fine-grained concrete on tensile cement for monolithic pipe joints. The objective of the study was to obtain material for sealing joints with specified physical and mechanical properties. For this, the optimal compositions of fine-grained concrete on tensile cements were determined from the conditions for obtaining a material that meets the requirements. Presented to concretes for sealing joints of concrete pipes of closed water supply systems. The studies were carried out in experimental facilities. It was established that fine-grained concrete based on tensile cement has a particularly dense structure, which determines their high impermeability, as well as increased crack resistance due to the presence of self-stress in them. High impermeability is due to its weakly porous structure with a rounded isometric pore shape, the absence of leaks between the aggregate and cement. Studies have found that by changing the water - cement ratio, the flow rate of the cement and sand, the structure of the concrete can be adjusted.
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Wei, Chun Ming, De Long Shao, Hui Su, and Qiang Zhao. "Finite Element Analysis on Exterior Joint of Reinforced Concrete Frame Structure." Applied Mechanics and Materials 166-169 (May 2012): 172–75. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.172.
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To investigate the effect of the horizontal construction joint on seismic behavior of the exterior joint of the reinforced concrete frame structure, the numerical simulation of the exterior joint with the construction joint under the low cyclic loading was done. The experimental results and the numerical simulation values were compared. Seen from the ultimate load, the experiment value is 158.7kN, the simulation value is 170kN, the relative error is about 11%.Further analysis of the exterior joint of reinforced concrete frame skeleton properties, the feasibility of applying unit construction joints is verified.
16
Ponomarev, N. K., and B. G. Fomin. "Characteristics of heating concrete with open construction joints." Hydrotechnical Construction 30, no. 1 (January 1996): 39–44. http://dx.doi.org/10.1007/bf02446382.
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Cui, Zhigang, Zhiheng Sun, Meng Li, and Jincheng Liu. "Repair Technology for Joint Damage of Sealing Cover Plate of Concrete Faced Rockfill Dam." E3S Web of Conferences 136 (2019): 04051. http://dx.doi.org/10.1051/e3sconf/201913604051.
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In view of damages that are common in anti-seepage coiled joints used in the water-sealing of the concrete faced rockfill dam junction surface, the construction method that uses SK hand scraping polyurea and tire base fabric to quickly repair the broken coiled joint is proposed. By polishing the surface of the commonly-used Ethylene-Propylene-Diene Monomer (EPDM) board coiled material and using a special BU primer, good adhesion can be ensured between the SK hand scraping polyurea and the EPDM board. The EPDM boards were joined by docked joints and lapped joints, the boards were coated with SK hand scraping polyurea and adhered with tire base fabric, and the tensile and peel tests are carried out. The results show that SK hand scraping polyurea and EPDM board is well bonded. The method using for the connection of EPDM board joints has the advantages of simple construction, high speed, good quality and good anti-seepage effect, and it has been successfully applied to repair of damages of concrete faced joints on Pushi River pumped storage power station in Liaoning and the Nazixia hydropower station in Qinghai.
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Yan, Xueyuan, Suguo Wang, Canling Huang, Ai Qi, and Chao Hong. "Experimental Study of a New Precast Prestressed Concrete Joint." Applied Sciences 8, no. 10 (October 10, 2018): 1871. http://dx.doi.org/10.3390/app8101871.
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Precast monolithic structures are increasingly applied in construction. Such a structure has a performance somewhere between that of a pure precast structure and that of a cast-in-place structure. A precast concrete frame structure is one of the most common prefabricated structural systems. The post-pouring joint is important for controlling the seismic performance of the entire precast monolithic frame structure. This paper investigated the joints of a precast prestressed concrete frame structure. A reversed cyclic loading test was carried out on two precast prestressed concrete beam–column joints that were fabricated with two different concrete strengths in the keyway area. This testing was also performed on a cast-in-place reinforced concrete joint for comparison. The phenomena such as joint crack development, yielding, and ultimate damage were observed, and the seismic performance of the proposed precast prestressed concrete joint was determined. The results showed that the precast prestressed concrete joint and the cast-in-place joint had a similar failure mode. The stiffness, bearing capacity, ductility, and energy dissipation were comparable. The hysteresis curves were full and showed that the joints had good energy dissipation. The presence of prestressing tendons limited the development of cracks in the precast beams. The concrete strength of the keyway area had little effect on the seismic performance of the precast prestressed concrete joints. The precast prestressed concrete joints had a seismic performance that was comparable to the equivalent monolithic system.
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Zhang, Wei, Zong Lin Wang, and Fadhil Naser Ali. "Shear Stiffness of Segmental Joints in Cantilever Casting Concrete Bridges." Advanced Materials Research 250-253 (May 2011): 2460–67. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.2460.
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Joints between segments in cantilever casting concrete bridges require special attention in design and construction. These joints introduce discontinuity in the bridge; furthermore weaken the connection stiffness and strength of corresponding section, which may lead to excessive downwarping of bridge. Experiments were conducted to assess the shear stiffness of segmental joints section. The parameters studied included monolithic non-joints, joints roughened, joints roughened with shear-key. It was found that the shear stiffness of jointed section is largely lower than that of non-jointed section; however, the shear-key can effectively enhance the shear strength and especially shear stiffness of the joints section. Measures are proposed for shear-key design, and may provide a rational basis for the design of cantilever casting concrete bridges.
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Li, Hong Jiang. "Influence of Stiffness Weakening at Construction Joints on the Deflection of Cantilevering-Cast Prestressed Concrete Box Girder." Applied Mechanics and Materials 777 (July 2015): 34–37. http://dx.doi.org/10.4028/www.scientific.net/amm.777.34.
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For a long-span prestressed concrete box-girder bridge erected by the double-cantilever segmental method, concrete of segmental joints and concrete in their nearby area may be different from integrally-cast concrete in structural performances. For example, the stiffness of segmental joints could be weakened significantly. To reveal influences of weakening in the stiffness of segmental joints on the deflection at mid-span of box girder, a typical continuous rigid frame bridge in China was taken as the analysis example, and its finite element models were established. In these models, weakening joints were simulated. After the validity of finite element models were warranted, the deflection in the completed construction stage and the long-term deflection in the running period of box girder were calculated, and then the variation of these deflections with the stiffness reduction in all segmental joints was described. Results showed that, compared with the shearing stiffness reduction in segmental joints, the bending stiffness reduction played more significant role in affecting the deflection of box girder. When the weakening times of joint stiffness arrived at 100, deflection values of the box girder increased significantly. However, in the practical engineering, the determination of stiffness reduction in segmental joints according by their damages, and the incorporation of weakening segmental joints into the bearing capacity assessment for existing box girders were all worth further study.
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Jang, Hyun-O., Han-Seung Lee, Keunhee Cho, and Jinkyu Kim. "Numerical and Experimental Analysis of the Shear Behavior of Ultrahigh-Performance Concrete Construction Joints." Advances in Materials Science and Engineering 2018 (August 28, 2018): 1–17. http://dx.doi.org/10.1155/2018/6429767.
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Shear performance of plain UHPC (ultrahigh-performance concrete) construction joints is studied in both experimental and analytical ways. In push-off tests, three different contact surfaces of the construction joint were considered, while the case without any joint was provided for the reference. Test results indicate that the geometry of contact surfaces greatly affects shear performance of the construction joint. With simplifying structural behavior of contact surfaces and UHPC substrate, the finite-element analysis model is developed for every case studied by utilizing the ABAQUS software and validated against the test results. Agreement between experimental and numerical simulation results is excellent especially in terms of displacement, strength, and failure mechanism. It is expected that the present work provides a basis for further study on reinforced UHPC construction joints.
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Kwon, Seung-Jun, Keun-Hyeok Yang, and Ju-Hyun Mun. "Mechanical Model for Shear Friction Capacity of Concrete at Construction Joints." Advances in Materials Science and Engineering 2018 (July 24, 2018): 1–12. http://dx.doi.org/10.1155/2018/9264503.
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This study examined the reliability and limitations of code equations for determining the shear friction strength of a concrete interface with construction joints. This was achieved by examining the code equations (ACI 318-14, AASHTO, and fib 2010) and comparing the results predicted by equations with experimental data compiled from 207 push-off specimens (133 rough and 74 smooth construction joints). The integrated mechanical model for the monolithic interface, derived from the upper-bound theorem of concrete plasticity, was also modified to estimate the shear friction strength of the construction joints. The upper limit for shear friction strength was formulated from a concrete crushing failure limit on the strut-and-tie action along the interfacial plane, to avoid overestimating the shear transfer capacity of transverse reinforcement with a high clamping force. Code equations are highly conservative and dispersive in predicting the shear friction strength of rough construction joints and yield large scattering in the data for the ratios between the measured and predicted shear friction strengths. The predictions obtained using the proposed model agreed well with test results, indicating correlating trends with the test results for evaluating the effects of various parameters on the shear friction strength of rough construction joints. According to the proposed model, the values of cohesion and coefficient of friction for concrete could be determined as 0.11 fc′0.65 and 0.64, respectively, for smooth construction joints and 0.27 fc′0.65 and 0.95, respectively, for rough construction joints, where fc′ is the compressive strength of concrete.
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Xiang, Ping, ZH Deng, YS Su, HP Wang, and 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, no. 3 (July 29, 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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Li, Zhenbao, Yanwei Cui, Kun Song, Hua Ma, and Zhenyun Tang. "The shearing performance of a beam-column joint in a reinforced concrete frame subjected to bidirectional loading." Advances in Structural Engineering 22, no. 15 (June 28, 2019): 3176–89. http://dx.doi.org/10.1177/1369433219859475.
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The anti-seismic capability of beam-column joints in reinforced concrete frame structures undergoing bidirectional loading may be lower than the designed capability for unidirectional earthquake action. To date, detailed calculation methods for the shear capability and shearing performance for joints in reinforced concrete frames subjected to bidirectional loading have not been reported. In this work, the shear mechanism of the beam-column joint in a reinforced concrete frame under bidirectional loading is analyzed. The study shows that when a synthetic shear force is imposed on the joint, the oblique compression zone comes into being at the corner of the joint, and the oblique compression strut is formed in the core area of the joint, which is different from the shear mechanism of the joint under unidirectional loading. A shear capacity calculation model is established based on the strut-and-tie model. Through the testing of reinforced concrete frame joints under bidirectional monotonous loading, the combined shear and deformation in the joint are obtained, the mechanical properties in each principal plane and in the combined shear action plane are analyzed, the shearing performance of the joints in a reinforced concrete frame under bidirectional loading is defined, and the shear contributions of hoop and column reinforcement are verified. The predicted values of the shear capability in this work are in good agreement with the reported experimental results.
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Yan, Xi Kang, Kang Ma, Su Duan Wang, Qian Qian Chen, Xiao Lei Hou, and Ling Qin. "Study on Failure Mechanism of Reinforced Concrete Frame with Construction Joint." Applied Mechanics and Materials 351-352 (August 2013): 434–37. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.434.
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According to the quasi static test of reinforced concrete frame with construction joints in, the fracture crack sequence, fracture morphology and plastic hinge are studied in detail. Research shows that two kinds processing method of construction joint will not affect the destruction form of a frame structure, but destruction order .
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Sha, Mo, Ping Liu, Jierui Gao, and Hua Ma. "Research status and application of prefabricated concrete frame joints." E3S Web of Conferences 260 (2021): 03025. http://dx.doi.org/10.1051/e3sconf/202126003025.
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Prefabricated concrete structure has the advantages of less energy consumption, easy quality control, fast construction speed, good construction site environment, and less contraction crack. As one of the important development directions of building structure at home and abroad, it is not only conducive to the development of China's construction industrialization and the improvement of production efficiency, but also greatly reduces the construction waste. The design of the connection between beam and column in the core plays an important role in the normal use and seismic performance improvement of the whole concrete structure. This paper reviews the research progress of prefabricated concrete frame joints both at home and abroad, introduce some applications of new connection, and analyses the merit and demerit of various connection methods and future development trend, in order to provide design reference for the engineering application of prefabricated concrete structure.
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Yang, Zhao, and Di Wu. "Analysis on the Holistic Resistant Behavior of Super High-Rise Concrete Structure Affected by the Concrete Strength of the Core of the Joints." Advanced Materials Research 1091 (February 2015): 89–95. http://dx.doi.org/10.4028/www.scientific.net/amr.1091.89.
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In the construction process of super high-rise structures, in order to simplify the construction process and ensure the construction quality, the construction team always make the concrete of joint core use the same strength grade with beams and plates, and pouring with them together. So that the concrete strength of joint core fail to meet the design requirement, whether the resistant behavior of the structure can be able to meet the design requirements is the key problem we focus on. In this paper, the finite element model of a super high-rise structure was established by MIDAS/GEN software, the holistic resistant behavior of the structure under the action of frequent earthquake was analyzed to study the effect of joint core concrete strength on the whole structure. The study provides the basis for further exploring a more reasonable pouring method of the concrete of the joints.
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Qi, Jianan, Jingquan Wang, Zhongwen Zhang, Wenchao Li, and Yuqing Hu. "Flexural behavior of an innovative dovetail ultra-high performance concrete joint using steel wire mesh interface treatment in composite bridges." Advances in Structural Engineering 23, no. 6 (December 2, 2019): 1142–53. http://dx.doi.org/10.1177/1369433219891531.
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An experimental program investigating the flexural behavior of an innovative dovetail ultra-high performance concrete joint for connecting precast ultra-high performance concrete slabs in composite bridges is reported in this study. Test parameters included interface treatment method, joint material, reinforcing bar overlapping form, and prestressing level. Specifically, a new steel wire mesh interface treatment was proposed, which could generate an additional fiber-bridging mechanism in the joint surface. An enhancement of 17.4%, 20.1%, and 50% on flexural cracking strength, ultimate strength, and ductility were obtained by using the steel wire mesh. Joint material showed no significant influence, while prestressing had obvious influence on the flexural behavior of ultra-high performance concrete joints. The post-cracking behavior, ductility performance, and stiffness degradation of the tested specimens were analyzed. Good deformability was obtained for the jointed ultra-high performance concrete slabs as the ratio of deflection to span was about 1/50 at failure. The post-cracking stiffness was retained at about 90% of the initial stiffness, while the ultimate stiffness was retained at about 10% of the initial stiffness. The research findings are useful in popularizing and applying the proposed innovative dovetail ultra-high performance concrete joints in composite bridges.
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Yang, Zhao, Xiao Yu, and Yang Zhi Zhong. "Influence of Concrete Strength of the Core of the Joints on the Holistic Resistant Behavior of Super High-Rise Structure." Applied Mechanics and Materials 351-352 (August 2013): 396–400. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.396.
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In the construction process of the super high-rise concrete structure, it’s easy to be happened that the concrete strength of joints can’t meet design requirements. Some finite element models of a super high-rise building were established by MIDAS in the paper, which were used to analyze the influence of concrete strength of the core of the joints on the holistic resistant behavior. The study may provide the basis for solving the construction quality problems of the core area of joints
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Sun, Hong Jun, and Li Hong Zhao. "Experimental Study on Strength of Connections to Concrete Filled Tubular in Fire." Advanced Materials Research 299-300 (July 2011): 743–46. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.743.
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Concrete filled tubular columns are widely used all over the world, due to their significant advantages, including attractive appearance, structural efficiency, reduced column footing, fast construction and high fire resistance without external fire protection. An experimental study has been carried out on the performance of joints between steel beams and concrete filled tubular columns in simple construction under fire conditions. The failure modes of the test specimens were always in the joint regions. Therefore, if the joints are appropriately designed and protected so that they possess sufficient strength, it is possible for the steel beam to develop catenary action and survive very high temperatures even without fire protection.
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Yan, Xi Kang, Bei Zhang, Guo Liang Zhao, and Shun Zhang. "Analysis of the Influence of Different Construction Joints on the Ductility of Cast-in-Place Frame Structure." Materials Science Forum 1020 (February 2021): 104–13. http://dx.doi.org/10.4028/www.scientific.net/msf.1020.104.
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This article through to the two common cast-in-situ frame structure (casting of a whole, with a construction joint) and 6 root not construction joints under axial pressure ratio through concrete columns of different processing low reversed cyclic loading experiment, study their experimental phenomena, hysteresis curves, displacement ductility, stiffness degradation, thus draw the conclusion: 1, the existence of the construction joint can lead to the decline of ductility of frame structure. 2. When the test axial pressure is relatively low, the presence or absence of construction joints and different treatment methods will obviously affect the ductility of the cast-in-place frame structure. 3. When the test axial pressure is relatively high, the presence or absence of construction joints and different treatment methods will not have a significant impact on the ductility of the cast-in-place frame structure.
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Smittakorn, Watanachai, Pattraporn Manavithayarak, and Patra Sukmoung. "Improvement of shear capacity for precast segmental box girder dry joints by steel fiber and glass fiber." MATEC Web of Conferences 258 (2019): 04006. http://dx.doi.org/10.1051/matecconf/201925804006.
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The use of precast segmental box girders in the bridge construction projects yields many benefits: economy, high quality, rapid construction, and minimal disruption to site. Previously, precast segments are connected together by epoxy joints. Epoxy fills in the gaps and makes strong connection, but it takes time and effort in the construction process. Later, dry joints have been introduced in the process, and hence the construction could be done much faster. However, there exists some drawback in using the dry joints. The contact surface between segments, especially at shear keys, can hardly be made smooth and well-fitted together. Consequently, the transferred shear strength cannot be developed to its full capacity. This study is an attempt to improve the capacity of shear strength of dry joints by adding steel fiber and glass fiber into concrete mixture. Considering specimens with single shear key, experiments have been conducted for shear capacities of 5 specimen types: ordinary concrete, concrete mixed with 1% and 2% steel fiber, and concrete mixed with 1% and 2% glass fiber. Results from experiments have shown that steel fiber helps increase the shear capacity of dry joints while glass fiber somehow degenerates the shear capacity and the compressive strength of concrete.
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Jensen, Thomas Westergaard, Peter Noe Poulsen, and Linh Cao Hoang. "Limit analysis of reinforced concrete slabs with construction joints." Engineering Structures 205 (February 2020): 110062. http://dx.doi.org/10.1016/j.engstruct.2019.110062.
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RUBIN, O. D., S. E. LISICHKIN, and O. V. ZYUZINA. "THE INFLUENCE OF BASALT-COMPOSITE PRESTRESSED REINFORCEMENT ON THE OPERATION OF LOW-REINFORCED CONCRETE STRUCTURES WITH INTERBLOCK CONSTRUCTION JOINTS." Prirodoobustrojstvo, no. 5 (2020): 50–59. http://dx.doi.org/10.26897/1997-6011-2020-5-50-59.
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It is proposed to use prestressed basalt composite reinforcement to strengthen reinforced concrete structures of hydraulic structures. In order to substantiate technical reinforcement of reinforced concrete structures of hydraulic structures with prestressed basalt composite inforcement, experimental studies were carried out. For experimental studies, reinforced concrete beam-type structures with vertical interblock construction joints were adopted.The results of experimental studies of reinforced concrete models of beam type with interblock joints reinforced with prestressed basalt composite reinforcement by the method of tension “on concrete”are presented. The models are tested for bending moment and transverse force. A special character of cracking is noted; full restoration of the bearing capacity of reinforced concrete structures, weakened by interblock construction joints, was recorded due to the reinforcement of prestressed basalt composite reinforcement.
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Lee, Ilwha, Yeong-Tae Choi, Sungho Joh, and Juhwan Um. "Deformation characteristics of discontinuous section of quick-hardening concrete tracks under full-scale test." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 231, no. 3 (August 4, 2016): 255–68. http://dx.doi.org/10.1177/0954409715626956.
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A quick-hardening concrete track has been developed to convert old ballast tracks into concrete tracks on operating lines. This method has been utilized to convert urban railways since 1997. With recent increases in train traffic and speed, maintaining track irregularities within design criteria has become essential to ensuring safety. On quick-hardening tracks, track irregularities are predominantly caused by irregular settlement around construction joints. These construction joints are inevitable in quick-hardening concrete; however, they create discontinuous sections that can affect the stable running of trains and structural durability. In this study, full-scale tests were performed with quasi-static and repeated loading on both continuous and discontinuous sections in which the earth pressure acting on the trackbed, accumulated settlement, and elastic displacement were measured. The results obtained indicate that construction joints are disadvantageous in terms of load transfer, settlement, and displacement. Additional field observations conducted on the Seoul Metro Line corroborated the results of the full-scale tests. The overall findings strongly suggest that construction joints on quick-hardening concrete tracks would need to be reinforced.
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Chen, Xi. "Stress Transferring Mechanism and the Bearing Capacity of Joints between Concrete-Filled Square Steel Tubular Special-Shaped Columns and Steel Beams." Applied Mechanics and Materials 105-107 (September 2011): 926–30. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.926.
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In recent years, a new type of frame consisting of steel beam and concrete-filled square steel tubular special-shaped column is increasingly widespread. Compared with the joint of ordinary reinforced concrete special shaped frame, the joint between concrete-filled square steel tubular special-shaped columns and steel beams has the advantage of better ductility, higher loading capacity, uncomplicated reinforcement disposing and convenience in construction. This paper indicates that the joint has strong energy dissipation capacity and high loading capacity, and the use of diaphragm is effective to enhance the structural performance of the joints. Stress transferring mechanism in the joints is discussed, and the calculating model of the shear strength of panel zone is established. This study is helpful for further study of the design and use of the joint between concrete-filled square steel tubular special-shaped columns and steel beams.
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Colajanni, Piero, Lidia La Mendola, Alessia Monaco, and Nino Spinella. "Cyclic Behavior of Composite Truss Beam-to-RC Column Joints in MRFS." Key Engineering Materials 711 (September 2016): 681–89. http://dx.doi.org/10.4028/www.scientific.net/kem.711.681.
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In the present paper, the cyclic behavior of beam-to-column joints made up of Hybrid Steel Trussed Concrete Beams (HSTCBs) connected to Reinforced Concrete (RC) piers is investigated. HSTCBs are a typology of composite beam generally constituted by a steel truss with end zone added rebars embedded within a block of concrete cast in place. HSTCBs represent a structural solution for light industrialization in the civil constructions; the main advantages in their use are the higher construction speed with the minimum site labor, the possibility of covering wide spans with low depths and a final economical convenience. For these reasons, they are also increasingly adopted within seismic framed structures. In the present study, the examined joints are representative of framed RC structures subjected to seismic actions and designed according to the current Italian standard code. Cyclic tests are performed and interpreted by means of analytical and numerical models with the aim of verifying the strength capacity and ductility of the system, focusing on both the global behavior and the force transmission between steel truss and concrete in the joint region.
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Amsyar, Faisal, Cher Siang Tan, Chau Khun Ma, and Arizu Sulaiman. "Review on Composite Joints for Cold-Formed Steel Structures." E3S Web of Conferences 65 (2018): 08006. http://dx.doi.org/10.1051/e3sconf/20186508006.
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Introduction of the lightweight cold-formed steel (CFS) sections to building construction has been well-established these days due to its high structural performance, corrosion resistance, ease of construction and maintenance as well as aesthetic appearance. In the early of 21th century, researchers found out that the structural performance of the CFS can be improved significantly by integrating it with other materials, for instance, concrete, to create the composite system. This is due to concrete material is excellent in compression but less effective to resist tension force. There were little works being carried out and lack of technical literature regarding on the composite connections for CFS structural frames, especially on the composite beam-to-column joints. This paper aims to collect and review on the previous researches of composite joints for CFS structures from the past two decades. The review is made in three distinctive topics i.e. CFS beam-to-column joints, composite beam-to-slab joints and composite beam-to-column joints. Most of the investigations indicated that composite joint yields higher ultimate load and moment resistance compared to the non-composite joint.
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Hou, Li-Qun, Shi-Cai Chen, Wei-Ming Yan, and Kang-Suk Kim. "Mechanical performance of space sandwich joints under bidirectional cyclic loading." Advances in Structural Engineering 22, no. 1 (May 31, 2018): 69–80. http://dx.doi.org/10.1177/1369433218778403.
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In high-rise buildings with high-strength concrete column and normal-strength concrete floor, the beams and slabs are usually cast in a continuous fashion through the beam–column joint to simplify construction, and this results in the lower strength concrete at the beam–column joint core (sandwich joint). It will influence the capacity of the joint. In this article, three groups of three-dimensional specimens consisting of sandwich joint specimens and corresponding traditional joint specimens were tested under bidirectional reversed cyclic loads to investigate seismic performance, including the failure mode, ductility, energy dissipation, and deformation. The test results show that the beam–column joint core can be cast with normal-strength concrete when the column concrete strength is less than 1.5 times that of the beam. However, when the ratio exceeds 1.5, the failure mode of the joint may change from beams flexural failure to joint shear failure and additional strengthening measures should be taken. Finally, the formula for calculating shear capacity of the three-dimensional sandwich joints is presented, and the predictions are compared to the experimental results.
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Bu, Yonghong, Qi Yang, Yihong Wang, and Dongfang Zhang. "Cyclic Testing of Bolt-Weld Joints Reinforced by Sleeves Connecting Circular CFST Columns to Steel Beams." Advances in Civil Engineering 2020 (January 28, 2020): 1–12. http://dx.doi.org/10.1155/2020/9674128.
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This study examined the design of joints reinforced by sleeves for connecting circular concrete-filled steel tube columns to steel beams. Six half-scale specimens, including four bolt-weld joints reinforced by sleeves and two bolt and stiffened end-plate joints, were designed and tested under cyclic loading to evaluate the seismic behavior of these joints. The joint construction and beam-column stiffness ratio were taken as the main parameters in the tests. The seismic behaviors, including the failure modes, hysteretic curves, ductility, strength and stiffness degradation, and energy dissipation, were investigated. The experimental results showed that no obvious bolt loosening, fracture, or widespread weld cracking appeared in the joints reinforced by sleeves. Furthermore, the joint strength and stiffness were markedly increased by the sleeves in the joint core area. Overall, most specimens exhibited full hysteresis loops and excellent ductilities, the equivalent viscous damping coefficients were 0.263∼0.532, and the ductility coefficients were 1.77∼3.42. The interstory drift ratios satisfied the requirements specified by technical regulations. The connections of these types exhibit favorable energy dissipations and can be effectively utilized for building construction in earthquake-prone areas. This research should contribute to the future engineering applications of concrete-filled steel tube to composite structure.
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Zhang, Dongfang, Junhai Zhao, and Shuanhai He. "Cyclic Testing of Concrete-Filled Double-Skin Steel Tubular Column to Steel Beam Joint with RC Slab." Advances in Civil Engineering 2018 (July 26, 2018): 1–15. http://dx.doi.org/10.1155/2018/7126393.
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The design of composite joints for connecting concrete-filled double-skin tubular (CFDST) columns to steel beams supporting reinforced concrete (RC) slabs is presented in this paper. Five half-scale specimens were designed, including four composite joints with RC slab and one bare steel beam joint, and were tested under a constant axially compressive force and lateral cyclic loading at the top end of the column to evaluate their seismic behavior. The main experimental parameters were the construction of the joint and the type of the column. The seismic behaviors, including the failure modes, hysteresis curves, ductility, strength and stiffness degradation, and energy dissipation, were investigated. The failure modes of the composite joints depended on the joint construction and on the stiffness ratio of beams to columns. Joints of stiffening type had significantly higher load-bearing and deformation capacities than joints of nonstiffening type. Compared with the bare steel beam joint, the bearing capacities of the composite joints with RC slabs were markedly increased. The composite action was remarkable under sagging moments, resulting in larger deformation on the bottom flanges of the beams. Overall, most specimens exhibited full hysteresis loops, and the equivalent viscous damping coefficients were 0.282∼0.311. The interstory drift ratios satisfied the requirements specified by technical regulations. Composite connections of this type exhibit excellent ductility and favorable energy dissipation and can be effectively utilized in superhigh-rise buildings erected in earthquake zones.
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Lu, Wei, Qi Wang, Bei Jiang, Shuo Xu, Bohong Liu, Peng Zhang, and Zhenhua Jiang. "Comparative study on bearing mechanism and design parameters of confined concrete arch joints in deep soft rock roadway." International Journal of Coal Science & Technology 6, no. 4 (November 12, 2019): 493–504. http://dx.doi.org/10.1007/s40789-019-00272-5.
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Abstract Square confined concrete arch is increasingly used in deep soft rock roadway support because of its advantages of high strength and construction convenience. However, the design of confined concrete arch in underground engineering still remains in experience-based method and lacks quantitative analysis. As a connecting component between arch sections, the connection joints have an important influence on the internal force distribution and failure mechanism of support arch. Therefore, a reasonable design of arch joints is the premise of rational support design. Taking Liangjia Coal Mine, a typical deep soft rock mine in China, as research background, this paper fully compared the most widely used joint types of confined concrete arch as analytical objects: flange joints and casing joints. The main failure modes of these two kinds of joints under bending moment are defined. Laboratory and numerical tests are carried out to study the mechanical characteristics of joints. Based on the M–θ curve, the influence law of different design parameters is analyzed, and the design principles of joints are proposed. The research results could provide a theoretical basis for the design and application of confined concrete arch in related projects.
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Zheng, Liang, Cheng Qin, Hong Guo, Dapeng Zhang, Mingtan Zhou, and Shaobo Geng. "Experimental and finite element study on the single-layer reticulated composite joints." Advances in Structural Engineering 23, no. 10 (March 3, 2020): 2174–87. http://dx.doi.org/10.1177/1369433220911118.
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In this article, a new type of reticulated joint, named the steel–concrete composite reticulated shell joint, is proposed. The proposed reticulated shell joint consists of an inner circular steel pipe, an outer circular steel pipe, a steel cover plate, and internal concrete. Five test specimens were tested under axial compression. The variable study included the wall thickness of the inner and outer circular steel pipes and the radius of the inner circular steel pipe. The test specimens exhibited a high bearing capacity and good plastic deformation ability under axial compression. The test results show that the wall thickness of the outer circular steel pipe and the radius of the inner circular steel pipe have a great influence on the bearing capacity of the steel–concrete composite reticulated shell joint, while the wall thickness of the inner circular steel pipe has little influence on the bearing capacity of the steel–concrete composite reticulated shell joint. Based on the test of the steel–concrete composite reticulated shell joints under axial load, the three-dimensional nonlinear finite element model was used to analyze the mechanical properties of the steel–concrete composite reticulated shell joints under axial compression. The results of the finite element analysis showed good agreement with the experimental results. The formula for calculating the bearing capacity of the joint is derived. By comparing with the experimental results, the calculated results are basically consistent with the experimental results.
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Cheng, Shao Tsai, and I. Tsen Liu. "Construction Technology for Improving Concrete Surface Quality." Applied Mechanics and Materials 353-356 (August 2013): 2803–7. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2803.
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The reinforced concrete is widely used in the current building system; there are several finishing-free concrete surface techniques for the time being, but the undesirable phenomena affecting flatness and smoothness, such as air voids, pores, honeycombs and cold joints on the completed surface often appear. For this study, the Vibration Degassing Machine (VDM) was created and patented which is used to conduct the second partial ramming modification on the interfaces between concrete and formworks that eliminates the air voids on concrete surface efficiently and reduces the pits after removing formworks to enhance the smoothness on concrete surface which ideally presents the beauty of original design.
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Maj, Marek, and Andrzej Ubysz. "Cracked reinforced concrete walls of chimneys, silos and cooling towers as result of using formworks." MATEC Web of Conferences 146 (2018): 02002. http://dx.doi.org/10.1051/matecconf/201814602002.
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There are presented in this paper some problems connected with reinforced concrete shell objects operation in the aggressive environment and built in method of formworks. Reinforced concrete chimneys, cooling towers, silos and other shells were built for decades. Durability of cracked shells are one of the most important parameters during process of designing, construction and exploitation of shells. Some reasons of appearance of horizontal and vertical cracks as temperature, pressure of stored material, live loads e.g. dynamic character of wind, moisture, influence of construction joints, thermal insulation, chemistry active environmental etc. reduce the carrying capacity of the walls. Formworks, as is occurred recently, are the reason for technological joints with leaking connection, imperfections of flexible formworks slabs and as result can initiate cracks. Cracked surface of this constructions causes decreasing capacity and lower the state of reliability. Horizontal, vertical cracks can caused corrosion of concrete and steel bars, decreasing stiffness of contraction, increasing of deflection and carbonation of concrete cover. Local and global imperfactions of concrete shells are increasing according to greater number of cracks...
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Tan, Yingliang, Bing Zhu, Le Qi, Tingyi Yan, Tong Wan, and Wenwei Yang. "Mechanical Behavior and Failure Mode of Steel–Concrete Connection Joints in a Hybrid Truss Bridge: Experimental Investigation." Materials 13, no. 11 (June 3, 2020): 2549. http://dx.doi.org/10.3390/ma13112549.
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The core part of a hybrid truss bridge is the connection joint which combines the concrete chord and steel truss-web members. To study the mechanical behavior and failure mode of steel–concrete connection joints in a hybrid truss bridge, static model tests were carried out on two connection joints with the scale of 1:3 under the horizontal load which was provided by a loading jack mounted on the vertical reaction wall. The specimen design, experimental setup and testing procedure were introduced. In the experiment, the displacement, strain level, concrete crack and experimental phenomena were factually recorded. Compared with the previous study results, the experimental results in this study demonstrated that the connection joints had the excellent bearing capacity and deformability. The minimum ultimate load and displacement of the two connection joints were 5200 kN and 59.01 mm, respectively. Moreover, the connection joints exhibited multiple failure modes, including the fracture of gusset plates, the slippage of high-strength bolts, the local buckling of compressive splice plates, the fracture of tensile splice plates and concrete cracking. Additionally, the strain distribution of the steel–concrete connection joints followed certain rules. It is expected that the findings from this paper may provide a reference for the design and construction of steel–concrete connection joints in hybrid truss bridges.
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Wang, Feng En. "Frame Beam-Column Joints in the Design of the Concrete Strength Grade." Applied Mechanics and Materials 638-640 (September 2014): 120–22. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.120.
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the framework structure beam-column node stress is complex, the traditional design, the strength grade of concrete frame column than beam slab concrete strength grade is high, the construction to bring huge inconvenience. After some experiments and experience, the design of beam-column joints of concrete strength grade should improve, convenient construction, improve the quality of engineering.
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TAKAHEI, YOSHIFUMI. "A STUDY ON CONSTRUCTION JOINTS IN UNDERGROUND CONCRETE STRUCTURE BY TOP DOWN CONSTRUCTION." Journal of Structural and Construction Engineering (Transactions of AIJ) 391 (1988): 19–26. http://dx.doi.org/10.3130/aijsx.391.0_19.
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Mantawy, Islam, Rahulreddy Chennareddy, Moneeb Genedy, and Mahmoud Reda Taha. "Polymer Concrete for Bridge Deck Closure Joints in Accelerated Bridge Construction." Infrastructures 4, no. 2 (June 1, 2019): 31. http://dx.doi.org/10.3390/infrastructures4020031.
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Prefabricated concrete bridge deck panels are utilized in Accelerated Bridge Construction (ABC) to simplify bridge deck construction. Concrete with good bond and shear strength as well as excellent flowability is required to fill bridge deck closure joints. This paper discusses the use of polymer concrete (PC) for bridge deck closure joints in ABC. PC produced using poly methyl methacrylate and standard aggregate was tested. Test results of PC are compared to Ultra-High Performance Concrete (UHPC). Development length, lap splice length and shear strength of unreinforced PC were tested. It is shown that PC has a development length of 3.6 to 4.1 times the reinforcing bar diameter that is close to one-half the development length of 6 to 8 times the bar diameter required with UHPC. PC also showed a shorter splice length compared with that reported for UHPC. Finally, unreinforced PC showed shear strength that is twice that of UHPC. It is evident that using PC in bridge deck closure joints in ABC can improve constructability and provide cost-savings and eliminate reinforcing bar congestion.
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Bayhan, B., J. P. Moehle, S. Yavari, K. J. Elwood, S. H. Lin, C. L. Wu, and S. J. Hwang. "Seismic Response of a Concrete Frame with Weak Beam-Column Joints." Earthquake Spectra 31, no. 1 (February 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.