Q690D高强钢箱形截面柱的滞回性能

Hysteretic Behavior of Q690D High Strength Steel Box-Section Beam Columns

为深入研究Q690D高强钢焊接箱形截面柱的滞回性能,在低周反复加载试验的基础上,对Q690D高强钢焊接箱形截面柱在低周反复荷载作用下的滞回反应进行有限元模拟,从试验和有限元分析所得的滞回曲线和骨架曲线看,Q690D高强钢焊接箱形截面柱的滞回曲线饱满,耗能能力良好.通过和试验结果的对比,验证了所建有限元模型的正确性.利用已验证的有限元模型分析了轴压比、构件长细比、壁板宽厚比对高强钢焊接箱形截面柱滞回性能的影响,分析结果表明高强钢柱的二阶效应影响不可忽略.在试验与有限元分析的基础上,提出Q690D高强钢焊接箱形截面柱的弯矩-曲率滞回模型,为Q690高强钢结构的弹塑性地震反应分析提供依据.研究结果表明,该滞回模型能够准确预测Q690D高强钢焊接箱形截面柱的滞回性能.

In order to study the hysteretic behavior of Q690D high strength steel （HSS） welded box section columns under cyclic loading, experiments and finite element simulations were conducted to study the hysteretic response of box section columns subjected to cyclic loading. From the obtained hysteretic curves and skeleton curves, it is observed that the Q690D HHS welded box section columns show a good energy dissipation capacity and seismic performance. After being verified by comparing with experimental results, the finite element（FE） model was employed to investigate the influence of axial compression ratios, slenderness ratios, width-thickness ratios of plate on the hysteretic behavior of Q690D box section columns. It is notices that the second-order effect cannot be neglected for Q690D HHS welded box section columns. Finally, hysteretic models for Q690D HSS welded box-section columns were proposed based on the results of experimental study and FE analysis, providing the foundation for nonlinear seismic analysis of high-strength steel structures. The proposed hysteretic models are demonstrated to be able to accurately predict the hysteretic behavior of Q690D high strength steel column by comparing the experimental and numerical results.