基于ANSYS的斜拉桥静风稳定性及脉动风抖振分析  

Analyses of cable-stayed bridges’ static wind stability and pulsating wind buffeting based on ANSYS

作　　者：宋红红 杨刚 姜亚丽 SONG Honghong;YANG Gang;JI^VNG Yali(College of Transportation Engineering,Dalian Maritime University,Dalian 116026,China)

机构地区：[1]大连海事大学交通运输工程学院

出　　处：《地震工程与工程振动》2019年第6期83-90,共8页Earthquake Engineering and Engineering Dynamics

基　　金：教育部科研业务费重点科学研究培育项目(3132019349)~~

摘　　要：以大连长山大桥为工程背景,基于ANSYS有限元软件,提出一个斜拉桥抗风分析方法。首先建立主桥段有限元模型,基于流体计算软件CFD(ComputationalFluidDynamics)得到主要梁段截面三分力系数,通过MATLAB生成Davenport脉动风速时程曲线。然后基于ANSYS二次开发功能,编制以增量法和内外迭代法为基础的非线性静风稳定性分析和以Davenport风速谱为基础的脉动风抖振分析程序。结果表明:该桥静风失稳风速为125m/s,远大于设计风速35.2m/s;在随时间变化的脉动风作用下横桥向振幅最大;在相同基本风速下,脉动风作用产生的位移明显大于静风作用,特别是横桥向和转角位移。该分析结果可为以后斜拉桥抗风设计提供参考。This paper takes Dalian Changshan Bridge as an example. Based on ANSYS finite element software, a set of wind analysis solution for cable-stayed bridges is proposed. Firstly, the finite element model of the mainbridge section is established;three force coefficients of typical main beam section are obtained based on CFD fluidcalculation software;through MATLAB, Davenport pulsating wind speed time-history curve is generated, Based onthe secondary development function of ANSYS APDL, the program of wind analysis is compiled. It mainly includesthe analysis of nonlinear static wind stability based on incremental and internal with external iterative method andpulsating wind buffeting analysis based on Davenport wind speed spectrum. The results show that the static wind in­stability speed of the bridge is 125 s,which is much higher than the design wind speed 35.2 ^^s. The trans­verse bridge amplitude is the largest under the action of pulsating wind with time Under the same basic wind speed,the displacement caused by pulsating wind action is obviously larger than that caused by static wind action,espe­cially the transverse and angular displacement of the bridge. The analysis results can provide a reference for windresistance design of cable-stayed Bridges in the future.

关 键 词：ANSYS CFD 静风稳定性分析 脉动风抖振分析 二次开发 

分 类 号：TU399[建筑科学—结构工程]