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Ruoyu Zhang,Changxi Feng,Ruoyu Zhang,Guangchao You,Rui Liu 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.1
In order to investigate mechanical properties of L-shaped column composed of concrete-filled square steel tubes (LCFT column) under eccentric compression, LCFT columns were designed and tested. Through two eccentric compression experiments, the failure mode, the curves of loading-displacement for the whole member and the curves of deflection for mono column (single limb of LCFT column) were obtained. Nonlinear finite element analysis was also employed in this investigation, in which thickness of tube flange, connecting plate thickness and diameter of the hole on connecting plate were discussed. According to results of eccentric compression test and finite element analysis, analytical method of bearing capacity of LCFT columns is proposed based on the yielding criterion of the cross-sectional edge stresses. Results of analytical method, finite element analysis and eccentric compression experiment are resistant with each other, and the accuracy of the analytical method in this paper is verified.
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Ruoyu Zhang,Bin Rong,Guangchao You,Changxi Feng,Rui Liu 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.22 No.2
In order to investigate mechanical properties and load-bearing capacity of T-shaped Concrete-Filled Square Steel Tubular (TCFST) composite columns under eccentric axial load, three T-shaped composite columns were tested under eccentric compression. Experimental results show that failure mode of the columns under eccentric compression was bending buckling of the whole specimen, and mono column performs flexural buckling. Specimens behaved good ductility and load-bearing capacity. Nonlinear finite element analysis was also employed in this investigation. The failure mode, the load-displacement curve and the ultimate bearing capacity of the finite element analysis are in good agreement with the experimental ones. Based on eccentric compression test and parametric finite element analysis, the calculation formula for the equivalent slenderness ratio was proposed and the bearing capacity of TCFST composite columns under eccentric compression was calculated. Results of theoretical calculation, parametric finite element analysis and eccentric compression experiment accord well with each other, which indicates that the theoretical calculation method of the bearing capacity is advisable.
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Computational Model of the Elastic Stiff ness of Panel Zone in Diaphragm-Through Connections
Bin Rong,Ziheng Yang,Ruoyu Zhang,Changxi Feng 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.5
The elastic stiff ness of the panel zone in diaphragm-through connection between square steel tubular column and H-shaped steel beam subjected to lateral loads is studied in this paper. Through analyzing the deformation mechanism of diaphragmthrough connection, the rotation of the panel zone is found to be the superposition of bending deformation of the column and shear deformation of the panel zone. Based on the mechanical model, the computational method of the elastic stiff ness of the panel zone in the diaphragm-though connection is developed. To verify the computational method, three cruciform specimens were tested subjected to a set of anti-symmetrical cyclic load at the beam tips. Based on the test results, the developed fi nite element model is verifi ed and used in the follow-up parametric analysis to check the applicability of the proposed computational method. Key variables involved are the width of column, thickness of column and the height-towidth ratio of the core tube.
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