大跨径桥梁静风稳定参数的敏感性分析

随着桥梁跨径的不断增大,桥梁结构质量越来越轻、结构刚度越来越小、结构阻尼越来越低,从而导致了对风致作用的敏感性越来越大。基于风洞试验测得的主梁静力三分力系数,在综合考虑结构几何非线性和静风荷载非线性的基础上,对大跨径悬索桥以及大跨径斜拉桥进行了静风失稳全过程分析;然后分别考察了三分力系数、初始风攻角、桥塔风荷载、缆索风荷载以及边跨风荷载等参数对大跨径缆索承重桥静风稳定性的敏感程度。

Sensitivity Analysis On Aerostatic Stability Parameter Of Long-Span Bridge

With increasing span length of bridge, bridge construction quality is more and more light, structural stiffness is more and more small, structural damping is more and more low, which led to the sensitivity of the wind-induced role is more and more big. Based on the main girder static coefficients measured by wind tunnel tests and wind load nonlinear, and considering geometrically nonlinear, the whole process of the static wind instability of long-span suspension bridge will be analyzed, as well as large-span cable-stayed bridge; Then the sensitivity aerostatic stability parameters of long span cable supported bridge, which contains of static coefficients, the initial wind angle of attack, the bridge tower wind loads and the rope wind loads and side cross wind load, were investigated.