大跨径桥梁静风稳定参数的敏感性分析  

Sensitivity analysis for aerostatic stability parameter of a long-span bridge

作　　者：李加武[1] 方成[1] 侯利明[2] 汪洁[3] 

机构地区：[1]长安大学公路学院,西安710064 [2]中交第一公路勘察设计研究院有限公司,西安710055 [3]西安建筑科技大学,西安710055

出　　处：《振动与冲击》2014年第4期124-130,共7页Journal of Vibration and Shock

基　　金：陕西省自然科学基金资助项目(2011JQ7009);陕西省教育厅科研项目(2010JK637);西安建筑科技大学校基金资助项目(DA01088)

摘　　要：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。With increase in span length of a bridge,its structural mass is lighter,its structural stiffness is smaller, and its structural damping is lower.They lead to its sensitivity to the wind-induced action is larger.Based on the main girder＇s static coefficients measured with wind tunnel tests and nonlinear wind load, considering the geometrical nonlinearity of the bridge structure,the whole process of the static wind instability of a long-span suspension bridge was analyzed,and that of a large-span cable-stayed bridge was also done.Then,the sensitivity of aerostatic stability parameters of long span cable supported bridges,including static coefficients,initial wind angle of attack,bridge tower wind loads,rope wind loads and side cross wind load,was investigated.

关 键 词：大跨径缆索承重桥 静风稳定 静风荷载 临界风速 

分 类 号：U448.2[建筑科学—桥梁与隧道工程]