Abstract

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Title:: Experiment on Seismic Behavior of Joint Between Composite CFST Column and Steel Beam Under High Axial Compression Ratio

Author(s):: ZHANG Yu-fen; ZHOU Jin-fu; ZHU Ge; JIANG Zong-hao; School of Civil and Transportation Engineering, Hebei University of Technology

Keywords:: composite CFST; beam-column joint; axial compression ratio; quasi-static test; seismic performance

Abstract:: In order to study the seismic performance of the joint between composite concretefilled steel tubular (CFST) column and steel beam under high axial compression ratio, three composite CFST external stiffening ring joint specimens followed by existing codes were designed and the quasi-static test was conducted. The failure mode, bearing capacity, deformability and energy dissipation capacity of the specimens under high axial compression ratio were studied. The results show that the ductility of joint can be improved by widening the width of external stiffening ring, and the initial stiffness of beam-column joint can be improved by adding ribs to the plate, then the integration is enhanced, both the bearing capacity and energy consumption capacity are improved. The failure of the joint starts from the yielding of beam flange and plastic hinges occur on both beam end and column end with the increasing load, but it is evident for specimens with anchored web stiffeners ribbed and specimens with widening the width of external stiffening ring to be buckling at the column ends in the latter loading. The stress is small in core zone and in elastic stage. So the beam-column joint under high axial compression ratio can satisfy the principle of strong joints, but it is unable to meet the requirements of “strong column and weak beam” for seismic resistance．