Experimental study on mechanical properties of new concrete-filled steel tubular beam-column joints
In order to study the mechanical properties of a new type of joint between a concrete-filled steel tubular column and a rectangular concrete-filled steel tubular beam with internal reinforcement plate,the specimens of the reduced size concrete-filled steel tubular beam-column joints were designed,and the static loading test and low-cycle reciprocating loading test of the same beam-column joints were carried out.By studying the failure modes and load-displacement curves of the joint specimens and skeleton curve and core shear deformation of pseudo-static loading test,the bearing capacity,ductility and energy dissipation capacity were analyzed,and the mechanical performance and failure mode of same beam-column joint under static loading and low-cycle reciprocating loading conditions were comprehensively investigated.The results showed that the core area of the concrete filled-steel tubular beam-column joint specimens had strong strength,and the failure modes are mainly the failure of beam end.The steel plate at the end of the beam near the beam-column connection is cracked and buckled in the low-cycle reciprocating loading test,and the weld at the beam end are cracked in the static loading test.The specimens had good ductility and experienced elastic,elastoplastic and plastic development stages during loading.Finally,the calculation formula of the shear strength in the core area of the concrete-filled steel tubular beam-column joint was presented.
万方数据
维普
