强风下高铁连续梁桥最大双悬臂状态抖振时域分析  

Time-domain analysis on buffeting responses of high-speed railway continuous girder bridge at longest double cantilever state under strong wind

作　　者：谢以顺[1,2] 王浩 张寒[1] 高宇琦[1] 陶天友 王飞球[2] Xie Yishun;Wang Hao;Zhang Han;Gao Yuqi;Tao Tianyou;Wang Feiqiu(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 211189,China;Jiangsu Engineering Co.,Ltd.,China Railway 24th Bureau Group,Nanjing 210038,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京211189 [2]中铁二十四集团江苏工程有限公司,南京210038

出　　处：《东南大学学报（自然科学版）》2021年第5期797-802,共6页Journal of Southeast University：Natural Science Edition

基　　金：中央高校基本科研业务费专项资金资助项目(2242020k1G013);江苏省重点研发计划资助项目(BE2018120).

摘　　要：为研究强风多发区高铁连续梁桥悬臂施工期结构风振响应,以华东沿海盐通高铁某特大连续梁桥为对象,开展了强风作用下大跨高铁连续梁桥最大双悬臂状态抖振时域分析.首先,建立了该桥最大双悬臂状态有限元模型.然后,采用谐波合成法分别模拟了双悬臂状态主梁和桥墩的三维脉动风场.最后,利用时域抖振分析方法,研究了不同设计风速和风攻角对连续梁桥最大双悬臂状态抖振响应的影响.结果表明:50年一遇设计风速下,主梁悬臂端竖向抖振位移响应峰值达主跨长度的1/1110,且位移响应峰值随风速增加迅速增大;与零度攻角和负攻角相比,正攻角强风作用下悬臂端抖振响应显著增大,施工设计时应予以充分考虑.To investigate the wind-induced vibration of high-speed railway continuous girder bridges in strong wind prone area at the cantilever construction stage,the buffeting responses of the long-span continuous girder bridge at the longest double cantilever stage under strong wind was investigated by taking a long-span continuous girder bridge of Yantong high-speed railway as an object.Firstly,the finite element model of the bridge at the longest double cantilever state was established.Then,the three-dimensional fluctuating wind fields of the main girder and the pier at the double cantilever state were simulated by using the harmonic synthesis method.Finally,the influence of different design wind speeds and wind attack angles on the buffeting responses of the continuous girder bridge at the longest double cantilever state was investigated by the time-domain buffeting analysis method.The results show that under the design wind speeds of 50 a,the peak value of the vertical displacement response of the cantilever end reaches 1/1110 of the length of the main span.The peak value of the displacement response increases rapidly with the increase of the wind speed.Compared with the zero attack angle and the negative attack angle,the buffeting response of the cantilever end under strong wind with the positive attack angle increases significantly,which should be considered in construction design.

关 键 词：高铁连续梁桥 最大双悬臂 动力特性 抖振 

分 类 号：U24[交通运输工程—道路与铁道工程]