静风效应对大跨径悬索桥空气动力行为的影响研究  

STUDY ON AEROSTATIC EFFECTS UPON AERODYNAMIC BEHAVIORS OF LONG-SPAN SUSPENSION BRIDGES

作　　者：邢鸿燕[1] 张新军[1] 孟松兔[1] 

机构地区：[1]浙江工业大学建筑工程学院,杭州310032

出　　处：《振动与冲击》2002年第4期50-52,43,共4页Journal of Vibration and Shock

摘　　要：大跨径悬索桥对风的作用非常敏感 ,静风荷载作用产生的非线性效应对大跨径悬索桥的空气动力行为(主要指颤振 )将产生不容忽视的影响。考虑静风荷载作用引起的结构动力特性以及作用在结构上空气动力的非线性变化因素 ,提出了基于静风平衡状态的三维非线性颤振有限元分析方法 ,并编制了计算程序。以润扬长江大桥为工程背景进行了分析和研究 ,并揭示了静风效应对大跨径悬索桥动力特性和颤振影响的程度和机理。Long_span suspension bridges are very susceptible to the wind action and the nonlinear effects due to the static wind action have unnegligible influence on the aerodynamic behaviors(mainly refer to flutter).Based on the equilibrium state under the static wind action,an approach of three_dimensional nonlinear flutter finite element anaysis is presented,in which the nonlinear effects of structural dynamic characteristics and the aerodymamic forae caused by the static wind action are fully considered.The computational procedure is also programmed.Numerical analyses are then performed for the Runyang Bridge over the Yangtze River and the influence mechanism and role of the aerostatic effects on the dynamic characteristics and aerodynamic behaviors of long_span suspension bridges are finally clarified.

关 键 词：空气动力行为 大跨径悬索桥 静风效应 颤振 三维非线性有限元分析 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]