Artículos de revistas: "Tubular steel structures. Structural dynamics"

1

Wang, Xiang Yang, Kao Shan Dai y Yi Chao Huang. "Field Testing of a Wind Turbine Tubular Tower and Structural Design of a Space Frame Steel Tower". Applied Mechanics and Materials 405-408 (septiembre de 2013): 1077–84. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.1077.

Texto completo

Resumen

Wind energy industry has been growing tremendously in recent years. Tubular steel towers are currently dominant supporting structures for wind turbines. With the increase of the converter capacity, there is a great demand for higher supporting towers. However, structural vibrations in extreme wind events tend to become a major concern during tower design. To study wind turbine tower dynamics, an existing tubular steel tower was tested. Vibrational frequencies and damping ratios were identified. To avoid unexpected dynamic problems, a space frame steel tower has been proposed for supporting larger wind turbines. It is a structural system that can be assembled on-site by using prefabricated beams, columns, and brace members. A typical space frame steel tower was designed in this paper. Static loading, modal and buckling analyses of the tower were presented. It is expected to introduce engineers and designers more options for wind turbine tower design.

Los estilos APA, Harvard, Vancouver, ISO, etc.

2

Boukhalkhal, Said Hicham, Abd Nacer Touati Ihaddoudène, Luis Filipe Da Costa Neves y Wafa Madi. "Dynamic behavior of concrete filled steel tubular columns". International Journal of Structural Integrity 10, n.º 2 (8 de abril de 2019): 244–64. http://dx.doi.org/10.1108/ijsi-07-2018-0040.

Texto completo

Resumen

Purpose The purpose of this paper is to investigate the static and dynamic inelastic response of rigid and semi-rigid connections of steel structures with concrete-filled steel tube (CFST) columns built in high seismic areas, and to compare it with those with open section columns. Design/methodology/approach CFST columns are frequently used in moment resistant steel frames located in seismic areas due to their inherent advantages, including their ductility, energy absorption capacity as well as their high bearing capacity. The smart combination of steel and concrete makes it possible to benefit from the advantages of both components to the maximum. This research work presents the nonlinear dynamic response of moment resistant steel frames with CFST columns, with rigid or semi-rigid connections, built in high seismic areas, according to the Algerian seismic code RPA 99/2003, European EC8 and American FEMA 356 to show the nonlinear characteristics of this type of structures, and their advantages over steel frames with open section columns. Findings The paper presents the advantages of using CFST columns with rigid and semi-rigid connections on the seismic response of portal steel frames. A high performance level in terms of ductility, plastic hinges distribution and their order of appearance has been obtained. It also shows the low effect of seismic loading on the structural elements with CFST columns compared to structures with open section columns. Originality/value The investigation of the numerical results has shown the possibility of their use in the seismic areas for their adequate performance, and also with respect to the design limits specified in the seismic guidelines. In addition, this study represents a first step to develop seismic performance factors for steel structures with CFST columns in Algeria, where the Algerian code do not include a comprehensive specification for the composite steel structures.

Los estilos APA, Harvard, Vancouver, ISO, etc.

3

Niu, Jian Hui, Ping Zhu y Yong Jin Guo. "Crush Performance of Top-Hat Tubular Structures Considering Different Forming Conditions". Advanced Materials Research 139-141 (octubre de 2010): 571–75. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.571.

Texto completo

Resumen

The influence of forming condition on crash performance of thin-walled structures is investigated, in which high strength low alloy steel HSLA340 and dual phase steel DP590 are considered. Stamping and knife-edge-bending process were carried out respectively to form hat channels, and then, impact tests were performed on the spot-welded top-hat sections subjected to quasi-static and dynamic axial loading conditions to identify the forming effect on the crashworthiness. Regular progressive buckling (quasi-inextensional mode) was observed for knife-edge-bent specimens, while the stamped specimens showed peculiar collapse mode, especially, global instability existed for all the specimens under dynamic impacting and their energy absorption capacity was significantly reduced. The result demonstrates that for accurate assessing the structural performance detailed stamping history of sheet metal components should be taken into consideration.

Los estilos APA, Harvard, Vancouver, ISO, etc.

4

YU, MIN, XIAOXIONG ZHA, JIANQIAO YE y YI Li. "FIRE RESPONSES AND RESISTANCE OF CONCRETE-FILLED STEEL TUBULAR FRAME STRUCTURES". International Journal of Structural Stability and Dynamics 10, n.º 02 (junio de 2010): 253–71. http://dx.doi.org/10.1142/s0219455410003452.

Texto completo

Resumen

This paper presents the results of dynamic responses and fire resistance of concrete-filled steel tubular (CFST) frame structures in fire conditions by using the nonlinear finite element method. Both strength and stability criteria are considered in the collapse analysis. The frame structures are constructed with circular CFST columns and steel beams of I-sections. In order to validate the finite element solutions, the numerical results are compared with those from a fire resistance test on CFST columns. The finite element model is then adopted to simulate the behavior of frame structures in fire. The structural responses of the frames, including the critical temperature and fire-resisting limit time, are obtained for the ISO-834 standard fire. Parametric studies are carried out to show their influence on the load capacity of the frame structures in fire. Suggestions and recommendations are presented for possible adoption in future construction and design of similar structures.

Los estilos APA, Harvard, Vancouver, ISO, etc.

5

Tang, Yunchao, Mingyou Chen, Yunfan Lin, Xueyu Huang, Kuangyu Huang, Yuxin He y Lijuan Li. "Vision-Based Three-Dimensional Reconstruction and Monitoring of Large-Scale Steel Tubular Structures". Advances in Civil Engineering 2020 (18 de septiembre de 2020): 1–17. http://dx.doi.org/10.1155/2020/1236021.

Texto completo

Resumen

A four-ocular vision system is proposed for the three-dimensional (3D) reconstruction of large-scale concrete-filled steel tube (CFST) under complex testing conditions. These measurements are vitally important for evaluating the seismic performance and 3D deformation of large-scale specimens. A four-ocular vision system is constructed to sample the large-scale CFST; then point cloud acquisition, point cloud filtering, and point cloud stitching algorithms are applied to obtain a 3D point cloud of the specimen surface. A point cloud correction algorithm based on geometric features and a deep learning algorithm are utilized, respectively, to correct the coordinates of the stitched point cloud. This enhances the vision measurement accuracy in complex environments and therefore yields a higher-accuracy 3D model for the purposes of real-time complex surface monitoring. The performance indicators of the two algorithms are evaluated on actual tasks. The cross-sectional diameters at specific heights in the reconstructed models are calculated and compared against laser rangefinder data to test the performance of the proposed algorithms. A visual tracking test on a CFST under cyclic loading shows that the reconstructed output well reflects the complex 3D surface after correction and meets the requirements for dynamic monitoring. The proposed methodology is applicable to complex environments featuring dynamic movement, mechanical vibration, and continuously changing features.

Los estilos APA, Harvard, Vancouver, ISO, etc.

6

Farhan, Muhammad, Mohammad Reza Shah Mohammadi, José António Correia y Carlos Rebelo. "Transition piece design for an onshore hybrid wind turbine with multiaxial fatigue life estimation". Wind Engineering 42, n.º 4 (11 de julio de 2018): 286–303. http://dx.doi.org/10.1177/0309524x18777322.

Texto completo

Resumen

Steel tubular structures are somewhat entrenched for the wind turbine towers. Recently, steel hybrid lattice/tubular towers are being investigated as a conceivable answer for taller onshore wind turbines for which convectional steel tubular towers are less competitive. Hybrid lattice/tubular towers require a transition piece which serves as a connection between lattice and tubular part. As the transition piece is supposed to transfer all the dynamic and self-weight loads to the lattice and foundation, these structural elements present unique features and are critical components to design and ought to resist strong cyclic bending moments, shear forces, and axial loads. Well-designed transition pieces with optimized ultimate state and fatigue capacities for manufacturing contribute to the structural soundness, reliability, and practicability of new onshore wind turbines hybrid towers. This research focuses on the investigation of the transition piece for an onshore wind turbine hybrid tower. The 5-MW reference wind turbine and a hybrid lattice/tubular tower were simulated in the servo-hydro aero-elastic analysis tool (by ASHES software) from which the loads and dynamic response of the supporting structure were obtained. Cross-sectional forces at the transition piece elevation were calculated and the connection with the lattice structure is designed. The transition piece was designed by finite element model considering ultimate limit load and fatigue load, using nonlinear analysis and multiaxial fatigue for life-time prediction, respectively. Multiaxial fatigue life was calculated based on Brown–Miller and Smith–Watson–Topper methods. In comparison, Smith–Watson–Topper method comes out to be more conservative. Potential of using high-strength steel S690 was investigated.

Los estilos APA, Harvard, Vancouver, ISO, etc.

7

Ruocco, Eugenio, Antonia Giovenale y Danilo Di Giacinto. "Numerical Impact Analysis of Folding-Induced Tubular Thin-walled Energy-dissipating Elements". Journal of the International Association for Shell and Spatial Structures 62, n.º 2 (1 de junio de 2021): 82–92. http://dx.doi.org/10.20898/j.iass.2021.013.

Texto completo

Resumen

This paper deals with the numerical impact analysis of tubular thin-walled steel-made elements with induced folding for energy dissipation application. The excellent deceleration of the impacting mass of axial collapsing structures favors their use in energy dissipation applications, such as impact resistance and rockfall protection. Dynamic Finite Element analyses have been carried out to evaluate the performance of vertical assemblies of cold-formed steel cell-shaped elements welded on each other to form collapsible tubular elements. In turn, these have been gathered in groups and restrained by galvanized steel wires to create modules. The axial collapse, which is the most effective energy absorption mechanism, has been triggered by shaping the elements' edge as serpentine. In the analysis, several assembly configurations have been subjected to a freefall rhombicuboctahedron-shaped rigid block impact; Falling height, impact angle, and block mass have been varied to investigate their effect on the performance. The numerical results show a good agreement when compared to those obtained through a real-scale experiment.

Los estilos APA, Harvard, Vancouver, ISO, etc.

8

Li, Zhao, Jingwei Gao, Jindong Xu y Guofeng Du. "Stress monitoring and impact bearing capacity of circular concrete-filled steel tubular short columns under axial impact loads". Advances in Structural Engineering 23, n.º 3 (23 de septiembre de 2019): 565–77. http://dx.doi.org/10.1177/1369433219876205.

Texto completo

Resumen

Compared with the traditional reinforced concrete columns, the concrete-filled steel tubular columns with a better restraint effect of steel tube on core concrete showed higher bearing capacity and ductility under static loads. However, except static loads, concrete-filled steel tubular columns are commonly exposed to the extreme dynamic loads including earthquake, explosion, and impact. The study on dynamic behavior of concrete-filled steel tubular columns is extremely significant to ensure their safety against such dynamic loads. In this article, a polyvinylidene fluoride piezoelectric smart sensor was proposed to monitor the axial impact bearing capacity of specimen based on stress monitoring under impact loads. The concrete-filled steel tubular columns with smart sensor embedded were tested, which considered the effects of both hammer impact heights and steel tube thickness on the axial impact bearing capacity. The impact bearing capacity calculated based on the monitoring results of polyvinylidene fluoride sensor is in good agreement with the measured values, which verifies the feasibility of this method. Moreover, it is found that the failure mode of concrete-filled steel tubular short columns is the local tearing failure or local buckling. In addition, non-linear finite element models were also established to study the effect of different parameters on the axial bearing capacity. The simplified formula for calculating the axial impact bearing capacity of concrete-filled steel tubular short columns was proposed based on the large amount verified model. Through the comparison between the calculation value and the test value, the formula is found to well reflect the axial impact bearing capacity of concrete-filled steel tubular short columns, which provides a reference for similar research.

Los estilos APA, Harvard, Vancouver, ISO, etc.

9

Zong, Zhou-Hong, Bijaya Jaishi, Ji-Ping Ge y Wei-Xin Ren. "Dynamic analysis of a half-through concrete-filled steel tubular arch bridge". Engineering Structures 27, n.º 1 (enero de 2005): 3–15. http://dx.doi.org/10.1016/j.engstruct.2004.08.007.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

10

Wang, Jinghai, Wanxiang Chen, Zhikun Guo y Wenguang Liang. "Dynamic Responses of RPC-Filled Steel Tubular Columns Post Fire Under Blast Loading". Open Civil Engineering Journal 10, n.º 1 (25 de mayo de 2016): 236–45. http://dx.doi.org/10.2174/1874149501610010236.

Texto completo

Resumen

Blast-resistant capacities of 4 large scale circular Reactive Powder Concrete Filled Steel Tubular (RPC-FST) columns after exposure to fire are experimentally examined. The overpressures of shock wave, the deflections and strains of RPC-FST column specimens are recorded by advanced gauges. The influences of fire durations and scaled standoff distances of explosive charge on the dynamic behaviors and failure modes are discussed. It is shown that the RPC-FST columns remain excellent blast-resistant capacities after exposure to fire. RPC core column can be effectively confined by steel tube, but the blast-resistant capacities of RPC-FST columns are decreased as explosive charge or fire duration increased. The failure modes are transited from bending types to bending-shear types as explosive charge increased, and an obvious plastic hinge at mid-span section can be observed in the RPC-FST column with fire duration of 105min. It is also indicated that the maximum displacements of RPC-FST columns are more sensitive to fire duration than to explosive charge weight.

Los estilos APA, Harvard, Vancouver, ISO, etc.

11

Kam, T. Y. "Nonlinear analysis of tubular steel framed structures". Computers & Structures 31, n.º 3 (enero de 1989): 445–52. http://dx.doi.org/10.1016/0045-7949(89)90392-1.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

12

Wang, Libin, Hui Jin, Haiwei Dong y Jing Li. "Balance Fatigue Design of Cast Steel Nodes in Tubular Steel Structures". Scientific World Journal 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/421410.

Texto completo

Resumen

Cast steel nodes are being increasingly popular in steel structure joint application as their advanced mechanical performances and flexible forms. This kind of joints improves the structural antifatigue capability observably and is expected to be widely used in the structures with fatigue loadings. Cast steel node joint consists of two parts: casting itself and the welds between the node and the steel member. The fatigue resistances of these two parts are very different; the experiment results showed very clearly that the fatigue behavior was governed by the welds in all tested configurations. This paper focuses on the balance fatigue design of these two parts in a cast steel node joint using fracture mechanics and FEM. The defects in castings are simulated by cracks conservatively. The final crack size is decided by the minimum of 90% of the wall thickness and the value deduced by fracture toughness. The allowable initial crack size could be obtained through the integral of Paris equation when the crack propagation life is considered equal to the weld fatigue life; therefore, the two parts in a cast steel node joint will have a balance fatigue life.

Los estilos APA, Harvard, Vancouver, ISO, etc.

13

Xian, Wei, Wen-Da Wang, Rui Wang, Wensu Chen y Hong Hao. "Dynamic response of steel-reinforced concrete-filled circular steel tubular members under lateral impact loads". Thin-Walled Structures 151 (junio de 2020): 106736. http://dx.doi.org/10.1016/j.tws.2020.106736.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

14

Ran, Yonghong, Xiuli Wang y Yuanyuan Du. "Test study on the dynamic response of steel tubular crib dam subjected to impact load". Australian Journal of Civil Engineering 17, n.º 2 (3 de julio de 2019): 134–42. http://dx.doi.org/10.1080/14488353.2019.1659709.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

15

Feng, Xiong, Sashi K. Kunnath y Liu Haowu. "Seismic behavior of concrete filled steel tubular arch structures". Earthquake Engineering and Engineering Vibration 4, n.º 1 (junio de 2005): 107–15. http://dx.doi.org/10.1007/s11803-005-0029-4.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

16

Stavridou, Nafsika, Efthymios Koltsakis y Charalampos C. Baniotopoulos. "Lattice and Tubular Steel Wind Turbine Towers. Comparative Structural Investigation". Energies 13, n.º 23 (8 de diciembre de 2020): 6325. http://dx.doi.org/10.3390/en13236325.

Texto completo

Resumen

Renewable energy is expected to experience epic growth in the coming decade, which is reflected in the record new installations since 2010. Wind energy, in particular, has proved its leading role among sustainable energy production means, by the accelerating rise in total installed capacity and by its consistently increasing trend. Taking a closer look at the history of wind power development, it is obvious that it has always been a matter of engineering taller turbines with longer blades. An increase in the tower height means an increase in the material used, thereby, impacting the initial construction cost and the total energy consumed. In the present study, a numerical investigation is carried out in order to actively compare conventional cylindrical shell towers with lattice towers in terms of material use, robustness and environmental impact. Lattice structures are proved to be equivalently competitive to conventional cylindrical solutions since they can be designed to be robust enough while being a much lighter tower in terms of material use. With detailed design, lattice wind turbine towers can constitute the new generation of wind turbine towers.

Los estilos APA, Harvard, Vancouver, ISO, etc.

17

Zhang, Yufen y Zhijun Zhou. "Beam-column connections of concrete-filled double steel tubular frame structures". Structural Design of Tall and Special Buildings 28, n.º 5 (15 de enero de 2019): e1592. http://dx.doi.org/10.1002/tal.1592.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

18

Yang, Baisong, Wei Wang, Lingxian Yang, Guorui Sun y Sijin Liu. "Study on Stressing State and Failure Criterion of Concrete-Filled Stainless Steel and Steel Tubular Column". Advances in Civil Engineering 2020 (20 de julio de 2020): 1–18. http://dx.doi.org/10.1155/2020/8868438.

Texto completo

Resumen

In this paper, the mechanical characteristics of concrete-filled stainless steel and steel tubular (CFSSAST) columns under axial and eccentric loads are analyzed by using the theory of structural stressing state. Firstly, the sum of generalized strain energy density (GSED) values of the short column at every load value (Fj) is normalized as Ej,norm to describe the structural stressing state. Then, according to Mann–Kendall (M-K) criterion and the natural law from quantitative change to qualitative change, the transition of stressing state is distinguished, which leads to the update of failure load. Then, the corresponding finite element models are established, and the accuracy of the models is verified by the experimental data, and the stress contour maps are analyzed by simulation data. Finally, the simulation data are used to perform parameter analysis. This study explores a new method to reveal the invisible working characteristics of structures and provides a new reference for the study of similar structures.

Los estilos APA, Harvard, Vancouver, ISO, etc.

19

Packer, Jeffrey A. y John S. M. Kremer. "A reliability assessment of tubular joint specifications". Canadian Journal of Civil Engineering 15, n.º 2 (1 de abril de 1988): 167–75. http://dx.doi.org/10.1139/l88-023.

Texto completo

Resumen

The limit states design of structural components involves the use of resistance factors which account for the variabilities and uncertainties which exist in both load effect and element resistance. In this paper, the rational development of such resistance factors is examined for axially loaded K, T, and Y joints between steel circular hollow section members subject to predominantly static loading. The development of these factors is primarily oriented to the design of such joints in offshore structures under extreme environmental loading conditions, but onshore applications to buildings are also considered. A level II method of reliability analysis has been used for the derivation of the resistance factors. The joint strength criteria from seven prominent code and noncode design documents have been considered, and recommendations for resistance factors to be used in the design of offshore and onshore tubular joints are made. Key words: steel, offshore structures, tubes, joints, reliability analysis, structural safety.

Los estilos APA, Harvard, Vancouver, ISO, etc.

20

Flaga, Kazimierz y Kazimierz Furtak. "Examples of Solutions for Steel-Concrete Composite Structures in Bridge Engineering / Przykłady Konstrukcji Zespolonych W Budownictwie Mostowym". Civil And Environmental Engineering Reports 16, n.º 1 (1 de marzo de 2015): 51–68. http://dx.doi.org/10.1515/ceer-2015-0004.

Texto completo

Resumen

Abstract The aim of the article [1] was to discuss the application of steel-concrete composite structures in bridge engineering in the aspect of structural design, analysis and execution. It was pointed out that the concept of steel-concrete structural composition is far from exhausted and new solutions interesting from the engineering, scientific and aesthetic points of view of are constantly emerging. These latest trends are presented against the background of the solutions executed in Poland and abroad. Particular attention is focused on structures of double composition and steel-concrete structures. Concrete filled steel tubular (CFST) structures are highlighted.

Los estilos APA, Harvard, Vancouver, ISO, etc.

21

Zhang, YT, B. Shan y Y. Xiao. "Axial impact behaviors of stub concrete-filled square steel tubes". Advances in Structural Engineering 22, n.º 11 (3 de mayo de 2019): 2490–503. http://dx.doi.org/10.1177/1369433219845094.

Texto completo

Resumen

Existing research on the widely used concrete-filled steel tubes is mainly focused on static or cyclic loading, and the studies on effects of high strain rate are relatively rare. In this article, seven stub concrete-filled steel tubular columns with square section were tested under both static and impact loads, using a large-capacity drop-weight testing machine. The research parameters were variable height of the drop-weight and different load types. The experimental results show that the failure modes of the concrete-filled steel tube columns from the impact tests are similar with those under static load, characterized by the local buckling of the steel tube. The time history curves of impact force and steel strain were investigated. The results indicate that with increasing impact energy, the concrete-filled steel tube stub columns had a stronger impact-resistant behavior. The dynamic analysis software LS-DYNA was employed to simulate the impact behaviors of the concrete-filled steel tube specimens, and the finite element results were reasonable compared with the test results. The parameter analysis on the impact behavior of concrete-filled steel tube columns was performed using the finite element model as well. A simple method was proposed to calculate the impact strength of square concrete-filled steel tube columns and compared favorably with experimental results.

Los estilos APA, Harvard, Vancouver, ISO, etc.

22

Liu, Yu-Fei, Xiao-Gang Liu, Jian-Sheng Fan, B. F. Spencer, Xiao-Chen Wei, Si-Yu Kong y Xiao-Hua Guo. "Refined safety assessment of steel grid structures with crooked tubular members". Automation in Construction 99 (marzo de 2019): 249–64. http://dx.doi.org/10.1016/j.autcon.2018.11.027.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

23

Ahn, Jin-Hee, Seok-Hyeon Jeon, Young-Soo Jeong, Kwang-Il Cho y Jungwon Huh. "Evaluation of Residual Compressive Strength and Behavior of Corrosion-Damaged Carbon Steel Tubular Members". Materials 11, n.º 7 (20 de julio de 2018): 1254. http://dx.doi.org/10.3390/ma11071254.

Texto completo

Resumen

Local corrosion damage of steel structures can occur due to damage to the paint-coated surface of structures. Such damage can affect the structural behavior and performance of steel structures. Compressive loading tests were, thus, carried out in this study to examine the effect of local corrosion damage on the structural behavior and strength of tubular members. Artificial cross-sectional damage on the surface of the tubular members was introduced to reflect the actual corroded damage under exposure to a corrosion environment. The compressive failure modes and compressive strengths of the tubular members were compared according to the localized cross-sectional damage. The compressive loading test results showed that the compressive strengths were affected by the damaged width within a certain range. In addition, finite element analysis (FEA) was conducted with various parameters to determine the effects of the damage on the failure mode and compressive strength of the stub column. From the FEA results, the compressive strength was decreased proportionally with the equivalent cross-sectional area ratio and damaged volume ratio.

Los estilos APA, Harvard, Vancouver, ISO, etc.

24

Tan, Qinghua, Leroy Gardner y Linhai Han. "Performance of Steel-Reinforced Concrete-Filled Stainless Steel Tubular Columns at Elevated Temperature". International Journal of Structural Stability and Dynamics 19, n.º 01 (20 de diciembre de 2018): 1940002. http://dx.doi.org/10.1142/s0219455419400029.

Texto completo

Resumen

Steel-reinforced concrete-filled stainless steel tubular (SRCFSST) columns combine the advantages of concrete-filled stainless steel tubular (CFSST) columns and steel-reinforced concrete (SRC) columns, resulting in excellent corrosion resistance, good economy, good ductility, and excellent fire resistance. Thus, SRCFSST columns have many potential structural engineering applications, especially in offshore structures. The performance of SRCFSST columns at elevated temperatures is investigated by finite element (FE) analysis in this paper. Firstly, FE models capable of capturing the full load-deformation response of structural members at elevated temperatures are developed and validated against relevant published tests on CFSST and SRC columns under fire conditions. Based on the validated FE models, the behavioral mechanisms of the SRCFSST columns under fire are explained by analysis of the sectional temperature distribution, typical failure modes, axial deformation versus time response, and load redistribution. Finally, the fire resistance of SRCFSST columns is evaluated in comparison to CFSST columns with equivalent sectional load-bearing capacity at ambient temperature or equivalent steel ratios. The results lay the foundation for the development of fire resistance design rules for SRCFSST columns.

Los estilos APA, Harvard, Vancouver, ISO, etc.

25

Huang, Fuyun, Yulong Cui, Rui Dong, Jiangang Wei y Baochun Chen. "Evaluation on ultimate load-carrying capacity of concrete-filled steel tubular arch structure with preload". Advances in Structural Engineering 22, n.º 13 (29 de mayo de 2019): 2755–70. http://dx.doi.org/10.1177/1369433219850091.

Texto completo

Resumen

When casting wet concrete into hollow steel tubular arch during the construction process of a concrete-filled steel tubular arch bridge, an initial stress (due to dead load, etc.) would be produced in the steel tube. In order to understand the influence of this initial stress on the strength of the concrete-filled steel tubular arch bridge, a total of four single tubular arch rib (bare steel first) specimens (concrete-filled steel tubular last) with various initial stress levels were constructed and tested to failure. The test results indicate that the initial stress has a large influence on the ultimate load-carrying capacity and ductility of the arch structure. The high preloading ratio will reduce significantly the strength and ductility that the maximum reductions are over 25%. Then, a finite element method was presented and validated using the test results. Based on this finite element model, a parametric study was performed that considered the influence of various parameters on the ultimate load-carrying capacity of concrete-filled steel tubular arches. These parameters included arch slenderness, rise-to-span ratio, loading method, and initial stress level. The analysis results indicate that the initial stress can reduce the ultimate loading capacity significantly, and this reduction has a strong relationship with arch slenderness and rise-to-span ratio. Finally, a method for calculating the preloading reduction factor of ultimate load-carrying capacity of single concrete-filled steel tubular arch rib structures was proposed based on the equivalent beam–column method.

Los estilos APA, Harvard, Vancouver, ISO, etc.

26

Yuan, Fang, Hong Huang y Mengcheng Chen. "Behaviour of square concrete-filled stiffened steel tubular stub columns under axial compression". Advances in Structural Engineering 22, n.º 8 (8 de febrero de 2019): 1878–94. http://dx.doi.org/10.1177/1369433218819584.

Texto completo

Resumen

As China’s infrastructure grows rapidly, the use of concrete-filled steel tubular structures for engineering applications is attracting increasing interest owing to their high section modulus, high strength and good seismic performance. However, for concrete-filled steel tubular members with large width-to-thickness ratio, steel tubes are prone to outward buckling when they are subjected to axial compression. Welding of longitudinal stiffeners on the steel tubes is one of the most efficient approaches for delaying local buckling and thus improving the mechanical performance of such type of concrete-filled steel tubular members. This study attempts to investigate the axial compression behaviour of concrete-filled stiffened steel tubular members with square sections through experimental study and finite element analysis. First, 14 concrete-filled steel tubular stub columns, with different width-to-thickness ratios of steel tube and depth-to-thickness ratios of stiffener, were subjected to axial compression loads and tested. It was found that the use of stiffeners increases the ultimate strength and improves the stability of the stub columns. Later, an investigation on the behaviour of the stiffened concrete-filled steel tubular stub columns was carried out through a three-dimensional finite element analysis. The accuracy of the finite element analysis model was verified by the test results. A parametric study was conducted to further evaluate the stiffening schemes that influence the axial compression strength. Finally, the research findings were synthesized into a new simplified model to predict the load-carrying capacity of stiffened concrete-filled steel tubular stub columns that allows for large width-to-thickness ratios.

Los estilos APA, Harvard, Vancouver, ISO, etc.

27

Li, Yan, Lihui Qin, Zhao Li y Tingting Yang. "Dynamic Performance of Strengthened Concrete-Filled Steel Tubular Arch Bridge due to Moving Vehicles". Journal of Aerospace Engineering 32, n.º 1 (enero de 2019): 04018113. http://dx.doi.org/10.1061/(asce)as.1943-5525.0000934.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

28

Li, Jun-Tao, Zong-Ping Chen, Jin-Jun Xu, Cheng-Gui Jing y Jian-Yang Xue. "Cyclic behavior of concrete-filled steel tubular column–reinforced concrete beam frames incorporating 100% recycled concrete aggregates". Advances in Structural Engineering 21, n.º 12 (7 de febrero de 2018): 1802–14. http://dx.doi.org/10.1177/1369433218755521.

Texto completo

Resumen

Concrete-filled steel tubular structural members can be recognized as an effective mean to improve the mechanical behavior in terms of strength, stiffness, ductility, and energy dissipation for the initial recycle aggregate concrete deficiencies compared with natural aggregate concrete. A small-scale model of square concrete-filled steel tubular column–reinforced concrete beam frame realized employing 100% recycled coarse aggregates was tested under combined axial loads and cyclic reversed lateral flexure. The failure modes, plastic hinges sequence, hysteresis loop, skeleton curve, stiffness degeneration, energy dissipation capacity, and ductility of the frame were presented and analyzed in detail. The structural behavior of square concrete-filled steel tubular column–reinforced concrete beam frame with 100% recycled coarse aggregates was compared with circular concrete-filled steel tubular column–reinforced concrete beam frame made with 100% recycled coarse aggregates. A fiber-based program model for the nonlinear analysis of concrete-filled steel tubular column–reinforced concrete beam frames incorporating recycled coarse aggregates was developed using SeismoStruct, to highlight the effect of recycled coarse aggregate content on mechanical behavior of recycled aggregate concrete and the confinement effect provided by outer tubes on core concrete. The analysis results show that the numerical model can well simulate and predict the seismic behavior of concrete-filled steel tubular column–reinforced concrete beam frames with 100% recycled coarse aggregate content. Both experimental and numerical results demonstrate that concrete-filled steel tubular column–reinforced concrete beam frames with large content of recycled coarse aggregates have a receivable seismic performance, and it is feasible to apply and popularize recycled aggregate concrete into concrete-filled steel tubular structures in seismic regions.

Los estilos APA, Harvard, Vancouver, ISO, etc.

29

Han, Lin-Hai, Wei Li y Reidar Bjorhovde. "Developments and advanced applications of concrete-filled steel tubular (CFST) structures: Members". Journal of Constructional Steel Research 100 (septiembre de 2014): 211–28. http://dx.doi.org/10.1016/j.jcsr.2014.04.016.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

30

Xie, Li, Mengcheng Chen, Wei Sun, Fang Yuan y Hong Huang. "Behaviour of concrete-filled steel tubular members under pure bending and acid rain attack: Test simulation". Advances in Structural Engineering 22, n.º 1 (27 de junio de 2018): 240–53. http://dx.doi.org/10.1177/1369433218783323.

Texto completo

Resumen

As infrastructure in China continues to develop rapidly, concrete-filled steel tubular structures are increasingly attracting interest for use in construction engineering owing to their high section modulus, high strength and good seismic performance characteristics. However, acid rain occurs throughout much of China, and the mechanical behaviour of concrete-filled steel tubular members may be affected by the corrosive environment created by acid rain. In this study, a total of 14 circular and square-shaped concrete-filled steel tubular members made of different types of concrete (general and recycled) and with varying corrosion rates (0%, 10%, 20% and 30%) were tested under four-point bending. After testing, the flexural behaviour of the corroded and uncorroded concrete-filled steel tubular beams were analysed in detail in terms of their failure modes, moment versus deformation curves and ultimate strength. The results indicate that the corrosion leads to an evident decrease in yield strength, elastic modulus and tensile strain capacity of steel plates and also to a noticeable deterioration in the ultimate strength of the concrete-filled steel tubular members. The replacement of general concrete aggregate with recycled concrete aggregate has little impact on the flexural performance of corroded and uncorroded concrete-filled steel tubular beams. Finally, comparisons were made between the experimental results and predicted ultimate strengths from four existing codes (GB 50936-2014, DB36/J001-2007, AIJ and EN 1994-1-1:2004).

Los estilos APA, Harvard, Vancouver, ISO, etc.

31

Nuta, Elena, Constantin Christopoulos y Jeffrey A. Packer. "Methodology for seismic risk assessment for tubular steel wind turbine towers: application to Canadian seismic environment". Canadian Journal of Civil Engineering 38, n.º 3 (marzo de 2011): 293–304. http://dx.doi.org/10.1139/l11-002.

Texto completo

Resumen

The seismic response of tubular steel wind turbine towers is of significant concern as they are increasingly being installed in seismic areas and design codes do not clearly address this aspect of design. The seismic hazard is hence assessed for the Canadian seismic environment using implicit finite element analysis and incremental dynamic analysis of a 1.65 MW wind turbine tower. Its behaviour under seismic excitation is evaluated, damage states are defined, and a framework is developed for determining the probability of damage of the tower at varying seismic hazard levels. Results of the implementation of this framework in two Canadian locations are presented herein, where the risk was found to be low for the seismic hazard level prescribed for buildings. However, the design of wind turbine towers is subject to change, and the design spectrum is highly uncertain. Thus, a methodology is outlined to thoroughly investigate the probability of reaching predetermined damage states under any seismic loading conditions for future considerations.

Los estilos APA, Harvard, Vancouver, ISO, etc.

32

Dong, Chun Xiao y Johnny Ching Ming Ho. "THEORETICAL MODEL FOR DOUBLE-SKINNED CONCRETE-FILLEDSTEEL-TUBULAR COLUMNS WITH EXTERNAL CONFINEMENT". Journal of Civil Engineering and Management 21, n.º 5 (6 de mayo de 2015): 666–76. http://dx.doi.org/10.3846/13923730.2014.893913.

Texto completo

Resumen

Recent advances in the production of super-fine cement and filler technology has made the production of high-strength concrete (HSC) of 120 MPa practicable in the industry. Nonetheless, the application of such HSC in real construction is still limited. One of the reasons that inhibits the use of HSC is the brittleness, which causes HSC structures to fail explosively if the concrete confinement is not adequate. The traditional method of installing transverse steel as confinement is not feasible in HSC structures, as the steel will be too congested to ensure proper concrete placing. To overcome the problem, double-skinned high-strength concrete-filled-steel-tubular (HSCFST) columns has been advocated, which could provide large, continuous and uniform confinement to HSC. However, a major shortcoming of the double-skinned HSCFST columns is the imperfect interface bonding that occurs at the elastic stage that reduces the elastic strength and stiffness of columns. To improve the situation, the authors have verified previously that using external steel rings on the outer steel tube can successfully restrict the dilation of HSCFST columns and thus restore an intact interface bonding condition. As a continued study, the authors will in this paper develop a theoretical model for predicting the uni-axial load-carrying capacity of doubled-skinned HSCFST columns.

Los estilos APA, Harvard, Vancouver, ISO, etc.

33

Hou, Jianling, Weibing Xu, Yanjiang Chen, Kaida Zhang, Hang Sun y Yan Li. "Typical diseases of a long-span concrete-filled steel tubular arch bridge and their effects on vehicle-induced dynamic response". Frontiers of Structural and Civil Engineering 14, n.º 4 (agosto de 2020): 867–87. http://dx.doi.org/10.1007/s11709-020-0649-9.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

34

Semko, Oleksandr, Viktor Dariienko y Vitaliy Sirobaba. "Deformability of Short Steel Reinforced Concrete Structures on Light Concrete". International Journal of Engineering & Technology 7, n.º 3.2 (20 de junio de 2018): 370. http://dx.doi.org/10.14419/ijet.v7i3.2.14555.

Texto completo

Resumen

The calculation, modeling and experimental research of steel-concrete tubular elements made of thin-walled galvanized sheet metal and lightweight concrete have been carried out. The proposed type of structures can be used as a separate structure in the form of a column or a pillar, and one of the types of the reinforcement of a certain light structure. The basic technological and constructive requirements for manufacturing and further exploitation of structures are given. For determination of actual work’s indexes of constructions experimental research of standards are undertaken, and recommendations on adjustment of well-known calculation formulas of close constructions as for structural parameters are given. The design (modeling) was performed in MSC / Nastran software. An analysis of the proposed structures use is carried out with the corresponding conclusions.

Los estilos APA, Harvard, Vancouver, ISO, etc.

35

Cakiroglu, Celal, Kamrul Islam y Gebrail Bekdaş. "Optimization of Concrete-Filled Steel Tubular (CFST) Columns Using Meta-Heuristic Algorithms". International Journal of Digital Innovation in the Built Environment 10, n.º 2 (julio de 2021): 63–74. http://dx.doi.org/10.4018/ijdibe.2021070105.

Texto completo

Resumen

Concrete-filled steel tubular (CFST) columns are an extensively studied area due to the favorable structural characteristics of these members. In order obtain the best possible performance from these structures while reducing the cost the use of optimization algorithms is indispensable. For this reason, meta-heuristic algorithms are finding increasing application in engineering due to their high efficiency. Various equations that predict the axial ultimate load-carrying capacity (Nu) of CFST columns are available in design codes as well as the research literature. However, most of these equations are only applicable within certain parameter ranges. A recently developed set of equations that have better parameter ranges of applicability was applied in this study. Furthermore, a newly developed meta-heuristic algorithm called social spider algorithm is applied to the cross-section optimization of circular CFST columns. The improvement of the structural dimensioning under Nu constraint was demonstrated.

Los estilos APA, Harvard, Vancouver, ISO, etc.

36

Wang, Weiqiang, Chengqing Wu, Yang Yu y Jun-jie Zeng. "Dynamic responses of hybrid FRP-concrete-steel double-skin tubular column (DSTC) under lateral impact". Structures 32 (agosto de 2021): 1115–44. http://dx.doi.org/10.1016/j.istruc.2021.02.062.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

37

Di Lorenzo, Gianmaria y Raffaele Landolfo. "Sensitivity Study of Dynamics Variability for Mild-carbon Steel Structures Affected by Corrosion". Open Construction and Building Technology Journal 13, n.º 1 (15 de noviembre de 2019): 251–68. http://dx.doi.org/10.2174/1874836801913010251.

Texto completo

Resumen

Background: Corrosion propagation mainly occurs due to environmental conditions and to the absence of adequate maintenance. The corrosion propagation affects the structural performances of slender and thin structures, in particular in the case of structure very sensitive to the wind action and its dynamical phenomena, because commonly they are designed with a precise optimization of the stiffness/mass ratio. The static and dynamic wind action represent an immediate safety hazard in the case of structural stiffness and mass reduction due to the corrosion depth. Objective: This paper discusses the dynamics behavior variability due to the corrosion depth propagation for two significant examples of slender and thin structure (i.e. tower and truss roof). Methods: The structures assumed as case of study are made of mild carbon. The corrosion depth variability was estimated based on literature references. The structural natural frequencies and modal shapes are assumed as significant magnitudes to discuss the effect of the corrosion on the structural elements. Results: Results have shown that the corrosion depth gives a significant reduction of frequencies and modification of modal shapes. Conclusion: Results have shown that the corrosion depth affect the structural behavior long before a structural collapse. It suggests that a monitoring must be done to estimate the structure reliability for the Serviceability limit state under Characteristic design loads.

Los estilos APA, Harvard, Vancouver, ISO, etc.

38

Sun, Wen Bo, Tao Hu y Wei Huang. "Research on Rigidity of Circular Tubular ZYY-Joint in Single Fold Surface of Multi-Planar Steel Structure of 26^th Universaide Shenzhen 2011". Advanced Materials Research 255-260 (mayo de 2011): 421–27. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.421.

Texto completo

Resumen

Due to its convenience of construction connection and simple appearance, steel tubular structure with simple joints is widely used in spatial structures. Tubular joint generally belongs to semi-rigid joint. Its different internal detail is closely related to the bearing capacity and stiffness of joints and its stiffness characteristic has some definite effects on the internal forces, deformation and bearing capacity of the steel tubular structure. In this paper, the roof structure of the main stadium of 26th Universaide Shenzhen 2011 was selected as the engineering background. This paper also studied the comparison test on different structural forms of spatial circular tubular ZYY-joints of the peaks of its steel structure by scaling down as the proportion of 1:3, and carried out a numerical analysis on these joints by finite element software ANSYS. It shows that, results of numerical analysis coincide with the experimental results and the joint with ribbed stiffener has better bearing capacity and stiffness, which can well meet the engineering needs.

Los estilos APA, Harvard, Vancouver, ISO, etc.

39

Wang, Jiantao y Qing Sun. "Cyclic testing of Q690 circular high-strength concrete-filled thin-walled steel tubular columns". Advances in Structural Engineering 22, n.º 2 (14 de agosto de 2018): 444–58. http://dx.doi.org/10.1177/1369433218790769.

Texto completo

Resumen

Under seismic action, the severe damage in critical regions of structures could be ascribed to the cumulative damage caused by cyclic loading. This article describes an investigation of the hysteresis behaviour of Q690 circular high-strength concrete-filled thin-walled steel tubular columns with out-of-code diameter-to-thickness ratios. A total of eight specimens were tested under constant axial compression and cyclic lateral loading. The study results of phase I testing consisting of a benchmark test were summarized to examine the seismic behaviour under standard loading, and those of the phase II testing that considered different fatigue loading modes and different concrete strengths were summarized to investigate the low-cycle fatigue behaviour. The load–displacement hysteretic curves, energy dissipation, strength and stiffness degradation were discussed in detail. A simplified method was proposed to predict the low-cycle fatigue life, which can be applied in the damage-based seismic design of circular concrete-filled steel tubular structures.

Los estilos APA, Harvard, Vancouver, ISO, etc.

40

Zhu, Zheng Hao, Wen Feng Du, Zhi Fei Sun y Li Ming Zhu. "The Bionic Optimization and Analysis and Calculation of the Cast-Steel Joint with Three Branches". Applied Mechanics and Materials 548-549 (abril de 2014): 1618–22. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.1618.

Texto completo

Resumen

The tree-like structure is a branch of space bionic structures,belonging to the Bionic Architectural Structures. Cast-steel joints with branches are the keys to build the tree-like structures.They are used widely,and the most common joints in our projects are cast-steel joints with two、three and four branches. The cast-steel joints with two branches are planar,while the joints with three and four branches are spatial.Until now,the basic theoretical researches about the cast-steel joints with branches are also relatively scarce.This paper did researches about mechanical properties, calculation methods and structural optimization of the cast-steel joints with three branches deeply and systematically. The result shows that the bending moment has a big influence on the value of the max stress. And the three main failure modes of the cast-steel joint with three branches are yield of the main tubular along the axial direction, local buckling at the connection of the main tubular and branches, and the tearing out of the branches.

Los estilos APA, Harvard, Vancouver, ISO, etc.

41

Agerskov, Henning. "The Fatigue Behavior of Steel Structures under Random Loading". Key Engineering Materials 378-379 (marzo de 2008): 3–16. http://dx.doi.org/10.4028/www.scientific.net/kem.378-379.3.

Texto completo

Resumen

Fatigue damage accumulation in steel structures under random loading has been studied in a number of investigations at the Technical University of Denmark. The fatigue life of welded joints has been determined both experimentally and from a fracture mechanics analysis. In the experimental part of the investigation, fatigue test series with a total of 540 fatigue tests have been carried through on various types of welded plate test specimens and full-scale offshore tubular joints. The materials that have been used are either conventional structural steel or high-strength steel. The fatigue tests and the fracture mechanics analyses have been carried out using load histories, which are realistic in relation to the types of structures studied, i.e. primarily bridges, offshore structures and chimneys. In general, the test series carried through show a significant difference between constant amplitude and variable amplitude fatigue test results. Both the fracture mechanics analysis and the fatigue test results indicate that Miner’s rule, which is normally used in the design against fatigue in steel structures, may give results, which are unconservative, and that the validity of the results obtained from Miner’s rule will depend on the distribution of the load history in tension and compression.

Los estilos APA, Harvard, Vancouver, ISO, etc.

42

Farajian, Majid, Thomas Nitschke-Pagel y Klaus Dilger. "Welding Residual Stresses in Tubular Joints". Materials Science Forum 768-769 (septiembre de 2013): 605–12. http://dx.doi.org/10.4028/www.scientific.net/msf.768-769.605.

Texto completo

Resumen

In spite of an increased awareness of welding residual stress threat to structural integrity, the extent of its influence on fatigue especially under multiaxial loading is still unclear and is a matter of debate. One important reason for this lack of clarities is that the determination of the initial welding residual stress field in welded structures even at the fatigue crack initiation sites is difficult and requires complementary instruments. Since the fatigue crack initiation in sound welds almost always occurs on the surface, the determination of surface residual stresses could increase the awareness of the extent of their threat to the structural safety. In this paper the development of residual stresses in different TIG-welded tubular specimens out of S355J2H and S690QL steel is studied and compared. The mechanisms of the development of residual stresses based on heat input and cooling rate are discussed. The welding parameters and thus heat inputs are varied and the mechanisms leading to different residual stress states are investigated. X-ray method was used for residual stress state characterization.

Los estilos APA, Harvard, Vancouver, ISO, etc.

43

Zhang, Jicheng, Yong Li, Yu Zheng y Zhijie Wang. "Seismic Damage Investigation of Spatial Frames with Steel Beams Connected to L-Shaped Concrete-Filled Steel Tubular (CFST) Columns". Applied Sciences 8, n.º 10 (20 de septiembre de 2018): 1713. http://dx.doi.org/10.3390/app8101713.

Texto completo

Resumen

Currently, the frame structures with special-shaped concrete-filled steel tubular columns have been widely used in super high-rise buildings. Those structural members can be used to improve architectural space. To investigate the seismic behavior of spatial composite frames that were constructed by connecting steel beams to L-shaped concrete-filled steel tubular (CFST) columns, a finite element analysis (FEA) model using commercial finite element software ABAQUS was proposed to simulate the behavior of the composite spatial frames under a static axial load on columns and a fully-reversed lateral cyclic load applied to frames in this paper. Several nonlinear factors, including geometry and material properties, were taken into account in this FEA model. Four spatial specimens were designed, and the corresponding experiments were conducted to verify the proposed FEA model. Each testing specimen was two-story structure consisting of eight single span steel beams and four L-shaped CFST columns. The test results showed that the proposed FEA model in this paper could evaluate the behavior of the composite spatial frames accurately. Based on the results of the nonlinear analysis, the stress developing progress of columns is investigated. The load transferring mechanism and failure mechanism are also determined. The results are discussed and conclusions about the behavior of those spatial frame structures are presented.

Los estilos APA, Harvard, Vancouver, ISO, etc.

44

Rudi Walujo, Prastianto, Hadiwidodo Yoyok Setyo y Fuadi Ibnu Fasyin. "Stress Concentration Factor of A Two-Planar Double KT Tubular Joint due to In-Plane Bending Loading in Steel Offshore Structures". MATEC Web of Conferences 177 (2018): 01006. http://dx.doi.org/10.1051/matecconf/201817701006.

Texto completo

Resumen

The purpose of this study is to investigate the proper Stress Concentration Factor (SCF) of a 60° two-planar DKT tubular joint of a tripod wellhead offshore structure. So far, calculation of SCF for a multi-plane tubular joint was based on the formulation for the simple/uniplanar tubular joints that yield in over/under prediction of the SCF of the joint. This situation in turn decreasing the accuracy of fatigue life prediction of the structures. The SCF is one of the most important parameters in the tubular joint fatigue analysis. The tubular joint is modelled as finite element models with bending loads acting on the braces that cover a wide range of dimensionless geometrical parameters (β, τ, γ). The effect of such parameters on the SCF distribution along the weld toe of braces and chord on the joint are investigated. Validation of the finite element model has shown good agreement to the global structural analysis results. The results of parametric studies show that the peak SCF mostly occurs at around crown 2 point of the outer central brace. The increase of the β leads to decrease the SCF. While the increase of the τ and γ leads to increase the SCF. The effect of parameter β and γ on the SCF are greater than the effect of parameter τ.

Los estilos APA, Harvard, Vancouver, ISO, etc.

45

Chen, Xi. "Design and Use of the Joint between Concrete-Filled Square Steel Tubular Special-Shaped Columns and Steel Beams". Key Engineering Materials 517 (junio de 2012): 870–74. http://dx.doi.org/10.4028/www.scientific.net/kem.517.870.

Texto completo

Resumen

Environmentally sustainable building construction has experienced significant growth during the past 10 years. The public is becoming more aware of the benefits of green construction, and green building is leading to changes in the way of owners, designers, contractors, and approach of the design, construction. Concrete-filled square steel tubular special shaped columns - steel beams residence installing efficient and light heat insulation wall is welcome for both owners and designers because of the columns having the same thickness with limb-filled walls, no-shocked indoor, easy to decoration and furniture layout, increasing in the actual using areas and saving carbon. The composite frame fully develops the merits of steel and concrete, and thus is reasonable and economical from both structural and construction viewpoints. The connection region as main force transfer component is key to the research of frame. 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 convenient in construction. This paper discusses the features of concrete-filled square steel tubular special shaped columns - steel beams frame, and the design and use of beam-column joint. From the experimental study on seismic behavior of the joint, it is shown that the joint has strong energy dissipation capacity and higher loading capacity. So it is expected it could play an important role in residence structures. 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.

Los estilos APA, Harvard, Vancouver, ISO, etc.

46

Šaraškinas, Viačeslavas y Audronis Kazimieras Kvedaras. "CALCULATION OF DEFLECTIONS OF HOLLOW CONCRETE-FILLED STEEL TUBULAR MEMBERS OF THREE-HINGE SUSPENSION STRUCTURE/KABAMOSIOS TRILANKSTĖS BETONŠERDŽZIŲ TUŠČIAVIDURIŲ VAMZDINIŲ PLIENO STRYPŲ KONSTRUKCIJOS ĮLINKIŲ SKAIČIAVIMAS". JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 7, n.º 2 (30 de abril de 2001): 99–105. http://dx.doi.org/10.3846/13921525.2001.10531710.

Texto completo

Resumen

Recently, in scientific literature, information on a new type of suspended straight-line 3-hinged roof structures has considerably increased. It was stressed that straight-line elements are easily manufactured and erected, roof decking service conditions are good. In the world building practice during last 30 years very effective composite structures have been introduced, even hollow concrete-filled steel tubular members. But no information on the application of such members for suspended roofs was obtained. In some sources very simple straight-line suspended roofs structures were analysed, and for those shapes an effective centrifuged hollow concrete-filled steel tubular members may be successfully applied. These members do not require additional roof stabilisation. These composite ropes may be attributed to the elements of final flexural stiffness, and they are effective and simple to decrease deflections of the suspended roof. However, for these composite ropes the methods of their deflection calculations must be developed because it is necessary to estimate their composite cross-section and interaction between components. This paper deals with analysis of these ropes' behaviour and their deflection calculation, which was made by exact I. Kalminzer's and other simplified methods. The vertical deflections in the middle of elements of the straight-line three-hinge composite suspended structure may be calculated as consisting of two parts depending on their bending and tension. The part of vertical deflection at mid-span of a composite member connected with its bending may be calculated as for hollow concrete-filled steel tubular beam taking into account the sum of flexural bending stiffness of its cross-sectional components (EJ) c . The I.Kalminzer's or other simplified methods taking into account the sum of flexural bending stiffness of cross-sectional components may calculate the vertical deflection called by tension of element as the member of final flexural stiffness (EJ) c . Comparison of experimental and theoretical data shows a good satisfaction when deflection calculation for the straight-line composite rope is made by dividing it into two parts depending on bending and tension. Investigation made into the deformation properties and methods of deflection definition of straight-line circular hollow concrete-filled steel tubular members allows declaring the possibility of useful application of such members as the ones of final flexural stiffness in suspended roof structures.

Los estilos APA, Harvard, Vancouver, ISO, etc.

47

Knoedel, Peter. "On the dynamics of steel structures with X-type bracing". Stahlbau 80, n.º 8 (agosto de 2011): 566–71. http://dx.doi.org/10.1002/stab.201101457.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

48

Dalcin, Rafael Luciano, Ivan Guerra Machado, Arnaldo Ruben Gonzalez y Cintia Cristiane Petry Mazzaferro. "Bending Strength of Welded Joints in TMCP Steel Square Tubular Profiles “T” Connexions". International Journal of Engineering & Technology 5, n.º 3 (2 de julio de 2016): 70. http://dx.doi.org/10.14419/ijet.v5i3.6195.

Texto completo

Resumen

The use of DOMEX 700 MCTM steel weldments is still little explored, due to some concern of the validity of the rules imposed by several standards and Codes for this class of steel. This material has low ductility and consequently the relation between tensile strength and yield strength is significantly lower than ordinary structural steels. For this reason, the instability phenomena are more critical than the instability phenomena of ordinary structural steels. Therefore, the aim of this study was to obtain detailed data on the mechanical efficiency of joints welded by GMAW. Six different heat inputs were used on square tubular profiles of TMCP steel. The tubular profiles were placed as a column/beam weldment with transverse and longitudinal welds positioned in relation to the loading axis. Twelve welded structures were instrumented with extensometer and tested in simple bending. Comparing the obtained data, it was verified that longitudinal welded joints presented higher bending strength than transversal welded joints. In the case of longitudinal joints, two weld beads were subjected to bending efforts, and in the case of transverse joints, only one weld bead resisted bending forces.

Los estilos APA, Harvard, Vancouver, ISO, etc.

49

Zhang, Hua y Qi Ming Li. "Research on Structural Stability of Prilling Tower in Fertilizer Industry". Applied Mechanics and Materials 368-370 (agosto de 2013): 1556–65. http://dx.doi.org/10.4028/www.scientific.net/amm.368-370.1556.

Texto completo

Resumen

Prilling tower is the core structure in the technological process of Nitro-compound fertilizer plant, whose safety is directly related to the normal operation of fertilizer production. Prilling tower is a hollow high special structure which is constructed by concrete-filled steel tubular (CFT) columns bonded by annularity truss and widely used in fertilizer plant. The stability study of the tower is still a blank at present as the structure's specific form. In this paper, buckling analysis is used to analyze the structure in order to define the CFT prilling tower's effective length, according to its characteristics. Its effective length is calculated with equivalent negative stiffness method and the stiffness demands of annularity truss are identified. Elastic-plastic stable assessment of structural stability is carried on using advanced analysis method. A new load model and evaluation method (lateral loading method) has been proposed based on advanced analytical results, which is suitable for evaluating elastic-plastic stability of high-rise steel structure. The stability design methods of such structures are also presented according to the analytical results, providing reference for similar structures and projects.

Los estilos APA, Harvard, Vancouver, ISO, etc.

50

Ma, Kai Ze. "Research on Restoring Force Model of High Strength Concrete-Filled Steel Tubular Columns". Applied Mechanics and Materials 166-169 (mayo de 2012): 1746–51. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.1746.

Texto completo

Resumen

Based on the experimental results of twenty three high strength concrete-filled square steel tubular (HCFT) columns subjected to cyclic lateral load, the restoring force model of square HCFT columns is established. Through theoretical analysis and experimental results, the main parameters of the restoring force model which are axial load ratio, confinement effect coefficient as well as slenderness ratio are discussed. The theoretical method is put forward. The results show that the relation of elastic stiffness to degraded stiffness, the relation of ultimate bearing capacity to yielding loads are proportional with confinement effect coefficient, and inversely with axial load ratio as well as slenderness ratio. Many various influential factors are considered in the restoring force model of square HCFT columns. The model is close to the experimental results which can be conveniently applied for nonlinear dynamics analysis of composite structures.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Artículos de revistas sobre el tema "Tubular steel structures. Structural dynamics"

Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros