大跨度自锚式悬索桥稳定性研究  

Research on the Stability of Long Span Self-Anchored Suspension Bridges

作　　者：胡建华[1] 王连华[2] 沈锐利[3] 向建军[1] 唐茂林[3] 

机构地区：[1]湖南交通规划勘察设计院,湖南长沙410008 [2]湖南大学土木工程学院,湖南长沙410082 [3]西南交通大学土木工程学院,四川成都610031

出　　处：《湖南大学学报（自然科学版）》2008年第7期12-15,共4页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(10502020;10772065)

摘　　要：利用大跨度悬索桥的挠度理论,建立了自锚式悬索桥加劲梁在恒载、恒载与活载及活载下的变形与荷载的平衡方程.对所建立的方程进行分析后,得到了如下结论:自锚式悬索桥加劲梁在恒载状态设计时,应按受横向荷载作用的压弯梁验算面内稳定性,但是活载作用下不存在面内稳定问题.此外提出了自锚式悬索桥的静力特性可以比拟为变高度连续桁架梁的观点,用此观点解释了所得到的理论研究结论.通过一座实桥的极限承载力分析和在根据实桥按比例制作的全桥试验模型上进行超载试验,证明了本文理论分析的结论是正确的.Based on deflection theory, the differential equations, describing the relationships between the deformation and load of stiffening girders of self-anchored suspension bridges subject to dead load or live load, or both of these two loads, were built. By analyzing the equations, the following conclusions were obtained： it is important to check the main plane stability according to the state of the compression-bend beam under transverse load in order to design stiffening girders of self-anchored suspension bridge under dead load. However, it is not necessary to verify the stability character of the main plane in cable-suspended section under live load. Moreover, the view point that the static characteristics of self-anchored suspension bridges may be a match of truss whose height changes continuously, was concluded.. The bridge test model was built to analyze the ultimate carrying capacity of the real bridge, and the over load test of self-anchored suspension bridges was carried out. And the results have verified the theory and its conclusion.

关 键 词：模型试验 自锚式悬索桥 挠度理论 结构稳定性 极限承载力 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]