冷弯薄壁型钢墙体拟动力试验研究

EXPERIMENTAL RESEARCH ON PSEUDO-DYNAMIC TEST FOR A COLD-FORMED THIN-WALLED STEEL WALL

为了分析地震下冷弯薄壁型钢墙体的动力性能和破坏形式,对一个3 m高的冷弯薄壁型钢墙体进行足尺模型拟动力抗震性能试验,得到了结构的时程位移曲线、滞回特性、破坏形式、刚度退化情况和延性性能等抗震特性。结果表明:结构变形位置都集中在墙体中部的横杆与斜杆交接处,其他节点未出现明显塑性变形;7度和8度多遇地震下结构仍处于弹性阶段,抗震性能较好;7度罕遇地震下刚度退化速度较快,但仍有承载能力,结构延性系数为4.7,具有很好的延性性能。

In order to analyze the dynamic behavior and failure modes of cold-formed thin-walled steel wall,a pseudodynamic test was performed on a full-scale cold-formed thin-walled steel wall with three-meter high,and the time history displacement curve,hysteretic characteristics,failure mode,stiffness degeneration,ductility behavior and other seismic behavior were obtained. The results revealed that the deformations were concentrated at the connections of the cross beam and the diagonal brace in the middle past of the wall,while the obvious plastic deformation would not produced in other joints. The structure was still at the elastic stage under 7 and 8 degree frequent earthquakes,which showed that it had a good seismic behavior. The stiffness of the specimen degenerated quickly under 7 degree rare earthquakes,but the bearing capacity still existed, and the ductility coefficient was 4. 7, which showed that the structure had a good ducility performance.