荆岳铁路洞庭湖大桥主桥抗风分析

Wind Resistant Analysis of Jing Yue Railway Dongting Lake Bridge

采用空间有限元模型分析荆岳铁路洞庭湖大桥主桥在成桥运营状态和施工全过程中的动力特性,评估主桥抗风安全性能。分析表明,中塔外边的长索对约束中塔纵桥向位移有一定的作用,过渡墩、辅助墩对主梁的横向和竖向振动的制约作用比较明显。主梁为钢桁梁,扭转刚度大,各工况的主梁弯扭耦合颤振和分离流扭转颤振的临界风速均超过了各自的主梁颤振检验风速,满足抗风安全性要求。

／The space finite element model analysis of Jing Yue Railway Bridge in Dongting Lake is performed to study the dynamic characteristics of bridge operation state and the whole process of con-struction and evaluate the wind resistance safety performance.Analysis result shows that the long ca-ble outside the middle tower has a certain role of constraining the longitudinal displacement of the bridge tower.The restriction role of transition pier and auxiliary pier to the horizontal and vertical vi-bration is more obvious.The main girder is made up of steel truss beam and has high torsion rigidity. The critical wind velocity of coupled bending torsion flutter and separated-flow torsion flutter of each working state exceed their flutter test speed.The wind resistance safety requirements are satisfied.