结构变形效应对大跨径悬索桥颤振的影响研究  

Study on the Effects of Structural Deformation on Flutter of Long-span Suspension Bridge

作　　者：张新军[1] 孙炳楠[2] 项海帆[3] 

机构地区：[1]浙江工业大学,浙江杭州310032 [2]浙江大学,浙江杭州310027 [3]同济大学,上海200092

出　　处：《公路交通科技》2003年第3期64-68,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金重大(59895410);浙江省自然科学基金(502118)

摘　　要：大跨径悬索桥对风的作用非常敏感,桥梁在风荷载的作用下将产生重大变形。由变形引起的结构动力特性以及空气力的非线性变化效应将会对大跨径悬索桥的颤振产生不容忽视的影响。基于结构的变形后状态,充分考虑结构变形引起的非线性效应,建立了大跨径桥梁颤振分析的三维非线性方法及其计算程序。结合某悬索桥进行了颤振分析和研究,并揭示了结构变形产生的非线性效应对大跨径悬索桥颤振影响的程度和机理。Long-span suspension bridge is most susceptive to wind action, and will be deformed significantly under the wind loading, which leads to the nonlinear variations of structural dynamic characteristics and the aeroelastic forces acting on the bridges.The flutter behaviors of long-span suspension bridges will be influenced remarkably by the nonlinear effects of structural deformation. Based on the deformed bridge structures, an approach of three-dimensional nonlinear flutter analysis is firstly presented, in which the nonlinear effects of structural deformation are fully considered.Numerical flutter analyses are then performed of a long-span suspension bridge.Finally, the role and mechanism of the nonlinear effects of structural deformation in the flutter behaviors of long-span suspension bridge are clarified.

关 键 词：大跨径悬索桥 颤振 非线性分析 结构变形 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]