四肢方圆钢管混凝土格构柱低周反复加载试验研究

Contrast research on square and circular CFST laced columns pseudo-static test

完成2个四肢方钢管混凝土格构柱和1个四肢圆钢管混凝土格构柱的低周反复加载试验。为研究方、圆钢管混凝土格构柱的破坏特征、抗震性能及更好的分析两种不同柱肢截面形式构件的抗震性能差异,各试件的尺寸采用等材料原则确定。试验结果表明:1缀管与柱肢的连接被撕裂是钢管混凝土格构柱的主要破坏形态;2方、圆钢管混凝土格构柱均有良好的综合抗震性能;3与方钢管混凝土格构柱相比,各试件的强度及延性相差不大,但圆钢管混凝土明显具有高的耗能能力及更小的刚度退化。最后,对方、圆钢管混凝土格构柱的合理应用进行探讨。

Two square concrete-filled steel tubular(CFST) laced columns and one circular CFST laced column were tested under cyclic lateral load. The size of the specimens determined using equivalent material principle in order to analyzing the differences of the failure characteristics and seismic behavior. The experimental results show that: 1 The main failure modes of CFST laced column is the tear of the lacing tubes and the column limb; 2 Both of them have excellent earthquake resistant capacities; 3 Compared with the square CFST laced column, the strength and ductility of structure are small, but the circular CFST laced column has the obvious advantage of the greater energy dissipation and smaller degradation. Finally, the reasonable application of the square and circular CFST laced columns has been discussed.