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Bin Rong,Guangchao You,Ruoyu Zhang,Xu Ma,Xinxin Quan 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.28 No.2
In order to investigate mechanical properties in the core area of Square Hollow Section(SHS) column connection with external stiffening ring, four specimens were tested under the static tension load. The failure modes, load-displacement curves and strain distribution were analyzed to study the mechanical properties and the load transfer mechanism of the core area of connections. The connections behave good ductility and load-bearing capacity under the static tension load. Parametric analysis was also conducted, in which the thickness of steel tube, extended width and thickness of the stiffening ring were considered as the parameters to investigate the effects on mechanical properties of the connections. Based on the experimental results, an analytical method for the bearing capacity of connection with external stiffening ring under the static tension load was proposed. The theoretical results and the experimental results are in good agreement, which indicates that the theoretical calculation method of the bearing capacity is advisable.
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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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Tensile Capacity of Concrete-filled Square Tubular Columns Connection with External Stiffening Ring
Bin Rong,Xinxin Quan,Ruoyu Zhang,Guangchao You 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.10
A static tensile experiment was carried out to investigate the flexural bearing capacity of external stiffening ring joints between concrete-filled square steel tubular column and steel beam. All of four specimens showed similar failure modes that external stiffening ring and tube flange were torn up. Nonlinear finite element model was developed with ABAQUS software to simulate the test and analyze the mechanism properties of specimens. Comparison of yield and ultimate capacity indicated that finite element analysis is valid. Moreover, on the basis of the failure modes, the distribution of stress, the deformation features and load transferring paths, which were achieved from experiments and numerical simulation, a theoretical method taking tensile membrane action of tube faces into consideration to evaluate the bearing capacity was proposed with help of yield line theory. The outcome of comparison between theoretical and experimental values clarify good applicability of this analytical method.
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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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