大跨度空间结构箱形钢柱的恢复力模型

Restoring Force Model of Steel Box Column in Large Span Spatial Structures

基于16根箱形钢柱的拟静力试验及85个箱形构件的数值分析,研究反复水平荷载作用下偏心常轴压箱形钢柱的恢复力特性。通过对试验和有限元结果进行回归分析,得到骨架曲线关键点的求解公式。根据试验结果确定了反复荷载作用下偏心常轴压箱形钢柱的刚度退化和强度退化规则。在此基础上,提出大跨度空间结构箱形钢柱的恢复力模型,并与试验结果进行比较,得出恢复力模型的求解精度较高,尤其能准确反映构件的刚度退化和强度退化特征,可用于大跨度空间结构的弹塑性反应分析。

Based on pseudo-static experimental results of 16 steel box columns and numerical results of 85 calculated members, the hysteretic behaviors of eccentrically constant-compressed steel box columns under cyclic lateral loading were investigated. By regression analysis on experimental and numerical results, the formulas for key points in skeleton curve were obtained. According to the experimental results, the degeneration rules of strength and stiffness of eccentrically constant-compressed columns under cyclic lateral loading were suggested. The restoring force model of steel box columns in large span spatial structures was proposed. Finally, the comparisons between results from the restoring force model and experiments were conducted. It was found that the restoring force model shows high solution precision, especially in the degeneration property of strength and stiffness of eccentrically constant-compressed columns under cyclic lateral loading. The restoring force model could be applied to the elastic-plastic analysis of large span spatial structures.