大跨径非对称支撑悬索桥静风稳定性分析

摘要

由于塔顶IP点存在标高差,非对称支撑的大跨径悬索桥其静风稳定性较传统悬索桥而言具有特殊性.基于增量内外迭代法,选择ANSYS二次开发平台APDL语言编制非线性静风稳定性的计算程序,并结合工程实例,对非对称支撑悬索桥进行静风稳定性全过程分析,并对不同三分力系数下模型的静风稳定性进行对比分析.分析结果表明:随着风速接近失稳临界风速,非对称结构的竖向变形最大;非对称支撑会降低静风临界风速;升力矩系数变化对临界风速影响最为显著,升力矩是导致大跨径非对称支撑悬索桥结构发生失稳破坏的主要因素.%Due to elevation difference at the IP point of the tower top,the static stability of asymmetric support suspension bridge,comparing with traditional suspension bridge,has its specialty.Based on incremental internal and external iteration method,this paper selected ANSYS secondary development platform APDL language to compile non-linear static stability calculating program.In combination with project practice,this paper carried out whole process analysis to static stability of the asymmetric support suspension bridge,and the static stability of the model under different ternary force coefficients is compared and analyzed.Results show that with the wind speed approaching the critical wind speed,the vertical deformation of the asymmetric structure is the largest;the asymmetric support will reduce the critical wind speed of the static wind,the influence of the lift moment coefficient on the critical wind speed is the most significant factor,and the lift moment is the main factor that causes the failure of the large span asymmetric supporting suspension bridge.