风屏障透风率对侧风下大跨度斜拉桥车-桥耦合振动的影响  

Effect of wind barrier porosity on coupled vibration of train-bridge system for long-span cable-stayed bridge in crosswind

作　　者：何玮[1] 郭向荣[1,2] 邹云峰[1,2] 何旭辉[1,2] 杨著[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中南大学高速铁路建造技术国家工程实验室,湖南长沙410075

出　　处：《中南大学学报（自然科学版）》2016年第5期1715-1721,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51322808;51508580;U1534206);中国铁路总公司科技研究开发计划项目(2015G002-C);中国博士后科学基金资助项目(2014M562133);中南大学"创新驱动计划"项目(2015CX006)~~

摘　　要：为研究风屏障透风率对侧风下大跨度斜拉桥车桥系统耦合振动的影响,通过风洞试验得出在桥梁上设置不同透风率风屏障情况下桥梁和桥上不同位置处列车的三分力系数,在此基础上根据弹性系统动力学总势能不变值原理进一步建立考虑风荷载的车桥系统耦合振动方程对侧风作用下大跨度斜拉桥车桥动力响应进行计算。研究结果表明:当风屏障透风率由10%增大至40%,迎风和背风工况下跨中处桥面竖向位移最大值均呈现增大趋势;风屏障透风率对迎风工况车辆动力响应的影响较大;当风屏障透风率由30%增大至40%时,车辆的脱轨系数、轮重减载率和横向摇摆力增幅较为明显。In order to study effects of wind barrier porosity on coupled vibration of train-bridge system in crosswind, by using static aerodynamic coefficients of both the trains at different rail positions and the bridge deck with different pored wind barriers measured by the wind tunnel test, according to the principle of total potential energy with stationary value in elastic system dynamics, the coupling vibration equation of train-bridge system considering the wind load was built up to calculate dynamic responses of trains and bridge of a long-span cable stayed bridge in crosswind. The results show that differences in the influence of wind barrier porosity change from 10% to 40% on the lateral displacement of mid-span between windward conditions and leeward conditions are significant. In windward conditions, the influence of wind barrier porosity changing on the dynamic responses of trains is more significant. Compared with the wind barrier porosity increases from 10% to 20%, the increase of derailment coefficient, rate of wheel load reduction and lateral swaying force of train is more significant when the wind barrier porosity increases from 30% to 40%.

关 键 词：风屏障 斜拉桥 耦合振动 动力响应 

分 类 号：U441[建筑科学—桥梁与隧道工程]