索对斜拉拱桥横向静风稳定性的影响  

Effect of Cable on the Lateral Stability Caused by Static-Wind Load of Cable-Stayed Arch Bridge

作　　者：钱雪松[1] 胡兆同[1] 李加武[1] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,陕西西安710064

出　　处：《郑州大学学报（工学版）》2010年第2期14-17,共4页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(50578014)

摘　　要：应用有限元软件ANSYS对斜拉拱桥在静风荷载作用下的面外稳定问题进行研究,考虑不同索预张力、索塔高度、索距及拉索布置位置等参数下索对斜拉拱桥横向静风稳定性的影响.结果表明:拉索可以有效控制结构的面外失稳形式,斜拉拱桥具有较高的横向抗风稳定性能;增大索预张力、增高索塔及减小索距都能改善结构横向静风稳定性能,且塔高影响最显著,增高索塔甚至能使横向静风稳定性能提高近一倍;拉索布置位置对横向静风稳定性能有明显影响,且索面中心线宜位于拱肋四分点处.In this paper,ANSYS FEM program is used to study the lateral instability behavior caused by static-wind load of cable-stayed arch bridge.Furthermore,the parameters,including initial cable tension,tower height,cable distance and position of cable on arch is considered in theoretical study.The results show that cables can control buckling form effectively,and cable-stayed arch bridge has better performance of lateral wind-resistant stability.Initial cable tension,tower height can be increased,and cable distance can be reduced to improve performance of lateral wind-resistant stability,and the effect of tower height is most extraordinary,increasing tower height even doubled the performance of lateral wind-resistant stability nearly.Position of cable on arch has obvious effect on the performance of lateral wind-resistant stability,and cable-plane centerline is appropriate in the quartile of arch rib.

关 键 词：斜拉拱桥 面外失稳 静风荷载 失稳形式 

分 类 号：U448.29[建筑科学—桥梁与隧道工程]