带外加强环板的钢管混凝土柱脚节点受力性能试验研究

为防止钢管混凝土柱埋入钢筋混凝土基础梁的柱脚节点发生冲切破坏,在钢管混凝土柱脚处设置外加强环板,通过两个缩尺模型一次短期单调荷载的静力试验,研究柱脚节点的破坏过程、破坏形态、竖向极限承载力,研究不同位置的加强环板对柱脚性能的影响,以及加强环板与钢管混凝土柱、外围混凝土的协同工作性能。与不设加强环板的柱脚节点对比分析发现,柱脚节点内设置加强环板,是防止冲切破坏、提高柱脚承载力的有效措施。

Mechanical behaviors of concrete-filled steel tubular column base joint with external annular steel plate

Installing external annular steel plate on the concretefilled steel tubular （CFST） column base to prevent the punching failure of CFST joint which is embedded in the reinforced concrete founda tion beam. Through a shortterm monotonic load static test of two scale model, studying the column base joint＇s failure process and failure mbde, vertical ultimate bearing capacity; and the influence on the performance of column base form different locations of the external annular steel plate ; and the coopera tive work performance of external annular steel plate working together with concretefilled steel tube col umn and the concrete. Comparing with the CFST joint without external annular steel plate, it is found that the CFST joint with external annular steel plate could effectively prevent punching failure and in crease bearing capacity of the column base.