带约束拉杆矩形钢管混凝土短柱轴压性能的试验

针对约束拉杆对矩形钢管混凝土柱轴压力学性能的影响,对8个轴压试件进行试验,其中1个不设约束拉杆,7个设置约束拉杆。试验主要参数为约束拉杆直径和间距,钢管宽厚比,截面长宽比。试验结果表明:相对于方形截面试件,矩形截面试件设置约束拉杆后,在轴向压力作用下,试件的承载力提高幅度不明显,但对应于峰值荷载的竖向应变值随约束拉杆的加强相应增大,试件的塑性变形能力增大,延性提高。利用国内已有文献中关于矩形钢管混凝土承载力计算方法及EC4(1996)关于方形钢管混凝土计算方法,对带约束拉杆矩形钢管混凝土轴压试件承载力进行计算,发现计算结果比试验值偏低,计算方法偏于保守。

EXPERIMENTAL STUDY ON BEHAVIOR OF RECTANGLE CFT STUB COLUMN WITH BINDING BARS SUBJECTED TO AXIALLY LOADING

A test on eight specimens of rectangle concrete-filled steel tubular(R-CFT) stub columns,including one specimen without binding bars and seven specimens with binding bars,is carried out,aiming at axially-loaded behavior of R-CFT influenced by binding bars.The primary study parameters are diameter and space of binding bar,width-thickness ratio of steel tube and length-width ratio of specimen cross-section.It is shown that the binding bars do enhance ductility and deformability of R-CFT,though not contributing to the ultimate bearing capacity of R-CFT.Finally,a comparison between the ultimate bearing capacity,calculated by the current methods at home and that of EC4(1996) respectively,and the counterpart of experiment results is conducted,which shows that the results of calculation are conservative.