韩家沱长江大桥高低雷诺数涡激振动试验研究  

Test Study of Vortex-Induced Vibration of Hanjiatuo Changjiang River Bridge at High and Low Reynolds Numbers

作　　者：杨咏漪[1] 陈克坚[1] 李明水[2] 廖海黎[2] 

机构地区：[1]中国中铁二院工程集团有限责任公司,四川成都610031 [2]西南交通大学风工程中心,四川成都610031

出　　处：《桥梁建设》2015年第3期76-81,共6页Bridge Construction

摘　　要：针对桥梁断面对雷诺数敏感性存在较大差异的情况,以渝利铁路韩家沱长江大桥(主跨432m的钢桁梁斜拉桥)为背景进行节段模型风洞试验。在XNJD-1和XNJD-3边界层风洞中分别进行高、低雷诺数涡激振动试验,比较2种不同尺度(1∶45.77和1∶19.74)的模型中断面涡激振动性能的差别,并通过不同质量和阻尼比试验获得涡激振动振幅与Scruton数的关系式,从而推算得到高、低雷诺数节段模型试验下的实桥振幅。结果表明:高、低雷诺数试验中,风攻角为-5°时,钢桁梁节段模型均出现了大幅的涡激振动,涡激振动的起振风速随着模型频率的增加而降低;按照低雷诺数试验结果换算得到的实桥涡激振动振幅高于按照高雷诺数试验换算的结果;增加二期恒载可以减少涡激振动振幅。In view of the considerable differences of sensitivity of bridge sections to the Reyn‐olds numbers ,the Hanjiatuo Changjiang River Bridge （a steel truss girder cable‐stayed bridge with a main span of 432 m） on Chongqing‐Lichuan Railway was cited as an example and the section model wind tunnel tests for the bridge were made .In the wind tunnel of XNJD‐1 and XNJD‐3 boundary layers ,the vortex‐induced vibration （VIV） tests at the high and low Reynolds numbers were respectively made and the differences of the VIV behavior of the sections in the models of two kinds of the scales （1∶45 .77 and 1∶19 .74） were compared .The relational expression between the VIV amplitudes and Scruton numbers was obtained from the different mass and damping ratio tests and the vibration amplitudes of the actual bridge under the section model tests at the high and low Reynolds numbers were hence calculated .The results indicate that in the tests at the high and low Reynolds numbers and when the wind attack angle is‐5＆#176; ,great VIV occurs in the section mod‐el of the steel truss girder ,the wind speed of the VIV decreases with the increase of the model fre‐quencies and the VIV amplitudes of the actual bridge converted from the tests of the low Reynolds numbers are higher than those converted from the tests of the high Reynolds numbers .The in‐crease of the second phase dead load can decrease the VIV amplitudes .

关 键 词：钢桁梁 涡激振动 风洞试验 模型试验 雷诺数 起振风速 振幅 

分 类 号：U448.211[建筑科学—桥梁与隧道工程] U446.1[交通运输工程—道路与铁道工程]