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Quasi-static Test on Ultra-high Strength Concrete Filled Steel Tube Columns(PDF)


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Quasi-static Test on Ultra-high Strength Concrete Filled Steel Tube Columns
WEI Jian-gang12 ZHOU Jun1 YANG Yan1 CHEN Bao-chun1
1. College of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China; 2. School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, Fujian, China
steel tube ultra-high strength concrete quasi-static test seismic performance ultimate bending moment
Taking axial compression ratio, steel ratio and aspect ratio as experimental parameters, quasi-static tests on eleven ultra-high strength concrete filled steel tubular(UCFST)columns were carried out, and load-displacement hysteretic curve, skeleton curve, as well as the seismic performance indexes such as ductility, energy consumption, strength and stiffness degradation were analyzed. The results show that with the increase of axial compression ratio, the ultimate bearing capacity and the ductility of the specimens decrease, the overall energy dissipation capacity also decreases, and the degradation in strength and stiffness is substantial. As steel ratio increases, the elastic stiffness and ultimate bearing capacity as well as the ductility can be improved, meanwhile the energy dissipation capacity increases, degradation levels for strength and stiffness decrease. As aspect ratio increases, the elastic stiffness and ultimate bearing capacity as well as the ductility decrease, while the overall energy dissipation capacity also decreases, and the degradation of strength and stiffness increase. Limited to the scopes of applicable materials, the current codified flexural rigidity and ultimate bending moment calculation methods for conventional composite structural members are not suitable for UCFST structures, and the deviation of calculation results are very large. It is necessary to modify them properly, so as to apply them to the flexural rigidity and ultimate bending moment calculation of UCFST structures.


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Last Update: 2020-10-15