柱壁加强型方钢管混凝土柱-H型钢梁节点 恢复力模型研究

为深入分析柱壁加强型方钢管混凝土柱-H型钢梁节点的抗震性能,在已完成相应拟静力试验的基础上,文章通过对试验数据回归计算分析,并结合试验加载过程和构件破坏特征来确定骨架曲线模型和滞回规则,建立此类节点的恢复力模型,最后将试验数据代入恢复力模型得到恢复力曲线。与试验曲线对比分析后发现,采用考虑刚度退化的三折线型骨架模型可以较好地反映不同阶段节点的受力特征,恢复力滞回曲线与试验滞回曲线拟合良好。结果表明所建立的恢复力模型可以较好模拟节点滞回性能,为柱壁加强型方钢管混凝土柱-H型钢梁节点的弹塑性地震分析提供了参考。

In order to analyze the seismic performance of column wall reinforced concrete-filled square steel tubular column-H-steel beam joint, a restoring force model of joint was established based on pseudo-static experiments. The skeleton curve model and stiffness degradation law were determined by analyzing the experimental data using regression calculation in combination with the failure characteristics of the components during experimental loading. Finally, the experimental data were incorporated into the restoring force model to obtain the restoring force curve. The comparison between the proposed restoring force model and experimental results shows that the trilinear skeleton curve models considering stiffness degradation can better reflect the mechanical characteristics of joints at different stages. The hysteretic curve of restoring force agrees well with the experimental hysteretic curve, indicating that the established restoring force model can simulate the hysteretic performance of joints accurately. The restoring force model provides a reference for the elastoplastic seismic analysis of column wall reinforced concrete-filled square steel tubular column-H-steel beam joint.