竖向荷载对T型钢连接钢框架抗震性能的影响

Influence of vertical load on aseismic performance of T steel connection steel frames

利用拟动力试验对T型钢半刚性连接钢框架在两种地震峰值加速度下的抗震性能进行研究,并对比分析了T型钢连接钢框架在柱顶施加竖向荷载和无竖向荷载等两种工况下的应变、位移和荷载变化以及荷载-位移滞回曲线,从而研究竖向荷载对半刚性连接钢框架抗震性能的影响。试验结果表明:T型钢半刚性连接钢框架具有较好的变形能力,滞回性能良好,抗震能力较强,且随着地震作用的增大,钢框架的动力反应增大;竖向荷载对钢框架的层间位移反应影响较大,而对节点区域的应变和层间荷载的影响较小。

Pseudo-dynamic test was carried out to study the seismic performance of a steel frame with T steel semi-rigid connections under two kinds of earthquake peak acceleration. Peak strain,displacement,load variation and load-displacement hysteresis curve for the frame were analyzed and contrasted under two kinds of loading conditions with vertical loads and without vertical loads,so as to investigate the effect of vertical load on the seismic behavior of a steel frame with semi-rigid connections. The experimental results showed that T steel semi-rigid steel frame had better deformation capacity and ductility performance,and that the hysteretic performance was good at the strong aseismic ability. It is also revealed that the dynamic response increased with the increase of earthquake loading,and that vertical loading had a bigger effect on the displacement response and had little effect on both the strain and interlayer load