固定支承式悬浮隧道在洋流涡激作用下的动力响应研究  

Dynamic response analysis of submerged floating tunnel supported on columns in vortex-induced vibration

作　　者：范泽旭 袁勇[1] 何任飞[1] 张金伟 贺维国 FAN Zexu;YUAN Yong;HE Renfei;ZHANG Jinwei;HE Weiguo(College of Civil Engineering,Tongji University,Shanghai 200092,China;China Railway Liuyuan Group Co.,Ltd,Tianjin 300308,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]中铁第六勘察设计院集团有限公司,天津300308

出　　处：《铁道科学与工程学报》2020年第3期653-659,共7页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51478343)。

摘　　要：以某拟建跨海铁路隧道工程为背景,研究单跨悬浮隧道在洋流涡激作用下的共振响应问题。将隧道结构简化为两端简支的欧拉-伯努利梁,流体阻尼力和拖曳力采用Morison公式计算,采用一种基于Vanderpol方程的尾流振子模型表述尾流涡街和结构的耦合作用。通过振型分解法和龙格-库塔法对偏微分方程组进行计算,分析结果表明:在某一洋流速度范围下,考虑流固耦合效应及非线性特征对结构涡激动力响应结果有显著影响。改变悬浮隧道单跨长是解决结构涡激共振问题最为有效的办法,在某些情况下,改变结构截面尺寸及结构阻尼比也能在一定程度下控制共振响应幅度。In the context of a planned tunnel project,this study focused on the dynamic response of single-span submerged floating tunnel(SFT)in resonance with vortex shedding.Tunnel tube was simplified as a simply supported Euler-Bernoulli beam.Drag force and damping force were calculated using Morison formula.By introducing a wake oscillator based on van der pol equation,the coupling between structure and wake could be thoroughly analyzed.Mode analysis method and Runge-Kutta method were adopted in solving differential equations.The results show that structural-wake coupling and nonlinearity have a significant influence on dynamic response of SFT.Changing span length is the most effective way in avoiding resonance problem.And under certain circumstance,the resonance response can also be restricted by optimizing sectional dimension and structural damping.

关 键 词：悬浮隧道 Morison公式 尾流振子 流固耦合 振型分解法 龙格-库塔方法 

分 类 号：U451.3[建筑科学—桥梁与隧道工程]