风荷载作用下悬索桥受力分析与静风稳定性研究

Research on Static Wind Stability and Stress Analysis of Suspension Bridge under Wind Load

风荷载是桥梁结构设计过程中需要考虑的重要因素之一,特别是对于山区跨峡谷等特殊地形,桥址所在地区风速和风向变化大,在其结构安全性验算环节必须要考虑风荷载对桥梁结构受力的影响。以吉茶高速公路矮寨特大悬索桥为例,对桥址区风速风向进行观测,建立风速概率密度曲线并对观测结果作了分析;利用ANSYS有限元模型,根据桥址处的风速和设计参数计算研究了静风荷载对桥梁主要构件内力的影响,同时对桥梁静风稳定性进行了基于三维非线性优化理论的验算。

Wind load is one of the important factors to be considered in the design of bridge structure especially for the special terrain such as mountain crossing gorge where wind speed and direction vary widely.For this kind of bridge,The influence of wind load on bridge structure must be considered when checking structural safety.Taking Aizhai Bridge on Jishou-Chadong expressway as the engineering background,we observed the wind speed and direction at the bridge site and stablished wind speed-probability density curve.We also calculated the stress of main components of the bridge under aerostatic load by using ANSYS Finite Element Model.On this basis,we checked the static wind stability of the bridgebased on 3d nonlinear optimization theory.