高轴压比下波纹侧板-方钢管混凝土柱抗震性能试验研究

Experimental study on seismic behavior of corrugated webs-square concrete filled steel tubular columns with high axial compression ratio

为研究高轴压比下波纹侧板-方钢管混凝土柱的抗震性能,设计了轴压比为0.8和1.0的两个试件进行低周往复荷载试验,得到了高轴压比下波纹侧板-方钢管混凝土柱的滞回曲线、骨架曲线和承载能力,计算出位移延性系数、刚度退化和累计耗能等抗震性能指标。研究结果表明:试件的破坏形态为弯剪破坏,剪切破坏发生在波纹侧板及核心混凝土,方钢管主要破坏特征为受压鼓曲和受拉断裂;试件的滞回曲线比较饱满,耗能性能良好,刚度退化稳定;随着轴压比的增大,试件的位移延性系数变小。总体来看,波纹侧板-方钢管混凝土柱在高轴压比下仍然能保持较好的抗震性能,可为后续的理论研究及实际工程应用提供依据。

In order to study the seismic performance of corrugated webs-square concrete filled steel tubular columns with high axial compression ratio,two specimens with axial compression ratios of 0.8 and 1.0 were designed for low-cycle reciprocating load test.The hysteretic curve,skeleton curve and bearing capacity were obtained,and the seismic performance indexes such as displacement ductility coefficient,stiffness degradation and cumulative energy consumption were calculated.The results show that the failure mode of the specimen is bending shear failure,the shear failure occurs in the corrugated webs.The main failure characteristics of the square steel tube and the core concrete are the pressure drum and the tensile fracture;the hysteresis curve of the specimen is full.The energy consumption performance is good and the stiffness degradation is stable;as the axial compression ratio increases,the displacement ductility coefficient of the test piece becomes smaller.Overall,corrugated side slab-square concrete-filled steel tubular columns can maintain good seismic performance under high axial compression ratio,which can provide basis for subsequent theoretical research and practical engineering applications.