单层单跨变截面轻型门式刚架滞回性能影响参数有限元分析

Finite element analysis on parameters influencing the hysteretic behaviors of single-strory single-bay light-weight portal frame with variable cross-sections

基于单层单跨变截面轻型门式刚架整体拟静力试验研究,对影响整体结构抗震性能的因素,如翼缘宽厚比、腹板高厚比以及楔率进行有限元分析,得到了上述因素对整体结构承载力、耗能能力、初始刚度和刚度退化等的影响规律,并给出合理取值区间,为结构设计提供一定参考。同时,在有限元分析结果的基础上,给出考虑翼缘宽厚比、腹板高厚比以及楔率影响的三线型骨架曲线关键参数拟合公式,为相关恢复力模型分析奠定基础。

Based on the pseudo-statlc test of single-strory single-bay light-weight portal frame, finite element analyses were carried out on the parameters influencing the seismic behaviors of the overall structure of portal frame, including width-thickness ratio of flange, depth-thickness ratio of web and tapering ratio. The influence laws of above parameters on bearing capacity, energy dissipation capacity, initial stiffness and stiffness degradation of the overall structure were obtained and the reasonable value intervals about these parameters were given, providing a reference for the structural design. At the same time, on the basis of the finite element analysis results, the fitting formulas for key parameters of tri-linear skeleton model were proposed considering the impacts of width-thickness ratio of flange, depth-thickness ratio of web and tapering ratio, laying foundation for analyses of relevant restoring force models.