关键词: 钢管混凝土, 斜柱, 转换节点, 轴向加载试验, 参数分析

Abstract: A new type of transferring joint with concrete filled steel tubular inclined columns was proposed in this study. The joint is composed of core concrete, longitudinal and horizontal steel plates, external steel plates and built-in profiled steel. The monotonic loading test of a specimen with geometric ratio of 1：6 was carried out. Then the failure mode of the joint zone was studied through numerical simulation, and the parameter analysis on the thickness of the steel plates in the joint zone was conducted. The experimental results show that the failure of the specimen occurs in the inclined columns, so it can meet the design concept of “strong joint and weak component”. The numerical simulation results further reveal the force transfer mechanism of the joint zone. The calculation results show that the failure mode of the joint zone is that the steel plates basically reach yield and the concrete at the bottom of the joint zone reaches the ultimate compressive strain. The ultimate bearing capacity and yielding load of the joint zone are 2． 10 times and 1． 19 times of those of the numerical model in which the inclined columns fail at first, respectively. The thickness variation of the external steel plates, which can transfer axial internal force and confine the concrete, has the greatest influence on the ultimate bearing capacity of the joint zone.

Key words: concrete filled steel tubular, nclined columns, transferring joint, axial loading test, parameter analysis