不对称独塔斜拉桥风致颤振分析

Wind-Excited Flutter Analysis of Asymmetric Single Tower Cable-Stayed Bridge

以某不对称独塔斜拉桥为例进行风致颤振分析,用桥梁有限元分析程序Midas Civil建立空间三维模型,对该桥成桥状态进行动力特性分析,并根据动力特性计算弯扭耦合颤振和分离流扭转颤振临界风速,对其抗风性能进行评估,结果表明,该桥成桥运营状态能够抑制自激风振。

Taking an asymmetric single tower cable-stayed bridge as an example,this paper analyzes the windexcited flutter. It establishes the three-dimensional model by using the finite element analysis program Midas Civil and analyzes the dynamic characteristics. Furthermore,the paper calculates the critical wind speed for the bending-torsion coupling flutter and for the separated-flow coupling flutter respectively based on its dynamic features. Finally,it assesses the wind-excited flutter of this bridge. The assessment results show that the selfexcited flutter of this bridge under the operation process of the completed bridge can be restrained.