基于流固耦合的加劲梁上部翼板颤振主动控制分析  

Analysis of Flutter Active Control of Upper Aerodynamic Wing Plates of Stiffening Girder Based on Fluid-Structure Interaction

作　　者：詹昊[1,2] 廖海黎[1] ZHAN Hao;LIAO Hai-li(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Major Bridge Reconnaissance ＆ Design Institute Co.,Ltd.,Wuhan 430056,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《桥梁建设》2018年第4期62-67,共6页Bridge Construction

基　　金：国家自然科学基金项目(51378442);国家重点基础研究发展计划项目(2013CB036300)~~

摘　　要：针对目前悬索桥加劲梁气动翼板颤振主动控制数值计算方法的局限性,提出采用流固耦合方法对加劲梁上部气动翼板的颤振控制进行分析。通过对Fluent软件二次开发,建立加劲梁-气动翼板系统流固耦合数值仿真计算模型,分析桥梁的颤振性能。以大贝尔特东桥为背景,采用流固耦合方法分析加劲梁上部设置气动翼板前、后该桥的颤振临界风速,研究气动翼板角速度对颤振临界风速的影响。结果表明:该桥颤振临界风速的数值仿真计算结果(72.0~74.0m/s)和节段模型风洞试验结果(70.0~72.9m/s)吻合较好;加劲梁上部设置气动翼板后,当前气动翼板与加劲梁扭转方向相反、后气动翼板与加劲梁扭转方向相同时,能显著提高加劲梁颤振临界风速;加劲梁最大扭转角随气动翼板角速度的增大逐渐减小。In view of the limitations of the current numerical calculation methods for the flutter active control of the upper aerodynamic wing plates of stiffening girders of suspension bridges,the fluid-structure interaction method was proposed for analysis of the flutter active control of the wing plates of a stiffening girder of the bridges.Based on the redevelopment of the software Fluent,the numerical simulation calculation model of the fluid-structure interaction for the stiffening girderaerodynamic wing plate system was established and the flutter performance of the girder was analyzed.The Great Belt East Bridge was selected as an example and the critical flutter wind speeds of the bridge before and after the wing plates were set above the stiffening girder of the bridge were analyzed,using the proposed method.Meanwhile,the influences of the angular velocities of the wing plates on the critical flutter wind speeds were also studied.The results demonstrate that the numerical simulation calculation of the critical flutter wind speeds of the stiffening girder（72.0~74.0 m/s）is in good agreement with the wind tunnel tests of the sectional model（70.0~72.9 m/s）of the girder.With the wing plates being set above the girder,when the torsional directions of the front wing plates are opposite to the torsional direction of the girder and when the torsional directions of the rear wing plates and the girder are the same,the critical flutter wind speeds of the girder can be obviously improved and moreover,the maximum torsional angles of the girder will gradually decrease with the increase of the angular velocities of the wing plates.

关 键 词：悬索桥 加劲梁 颤振 流固耦合 临界风速 主动控制 上部气动翼板 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]