固定支承式悬浮隧道在列车荷载下的竖向动力响应研究  

Dynamic response analysis of submerged floating tunnel supported on columns under train load

作　　者：何任飞[1] 袁勇[1] 贺维国 张金伟 HE Renfei;YUAN Yong;HE Weiguo;ZHANG Jinwei(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1期167-173,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：为了研究列车荷载下固定支撑式悬浮隧道的动力响应问题,以一拟建铁路隧道工程为背景,将水中隧道简化为两端简支的欧拉-伯努利梁,列车荷载简化为一系列移动集中力,建立列车荷载下隧道管体振动微分方程,并通过振型叠加法和隐式数值积分方法求解。以模态分析和时程分析为基础,探讨荷载列速度、水体对动力响应的影响。研究结果表明:移动荷载列通过悬浮隧道时,管体跨中位移放大系数在共振速度处出现了极大值。数据对比表明,水体惯性力相当于增加了隧道管体的附加质量,使其自振频率有所减小,进而减小了荷载列的共振速度,但水体会放大隧道管体共振时的位移响应。In order to study the dynamic response of submerged floating tunnel(SFT) supported on columns under train load, in the context of a planned tunnel project, the tunnel tube was simplified as a simply supported Euler-Bernoulli beam, and the train load was simplified as a series of moving concentrated forces. The differential equation for the vibration of the tunnel tube under train load was deduced. Mode superposition method and implicit numerical integration method were adopted to solve the equations. Based on modal analysis and time-history analysis, the effects of load velocity and water body on dynamic response were discussed. The results show that the maximum of displacement amplification factor at the mid-span appears at the resonance velocity when moving loads pass through the SFT. Data comparison indicates that the inertial force of water body provides the additional mass for the tunnel tube. So the natural frequency of the tube decreases and the resonance speed of the moving loads is reduced. However, the displacement response when resonance occurs will be amplified by the water body.

关 键 词：悬浮隧道 固定支承式 列车荷载 动力响应 振型叠加法 

分 类 号：U451.3[建筑科学—桥梁与隧道工程]