随机地震激励下水中悬浮隧道的动力响应  

Dynamic Response of the Submerged Floating Tunnel Under Random Seismic Excitation

作　　者：董满生[1,2] 李满[1] 林志[2] 唐飞[1] 蒋树屏[2] 

机构地区：[1]合肥工业大学交通运输工程学院,合肥230009 [2]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《应用数学和力学》2014年第12期1320-1329,共10页Applied Mathematics and Mechanics

基　　金：交通运输部建设科技项目(2013318740050);中国博士后科学基金(20110490833)~~

摘　　要：将张力腿定位的水中悬浮隧道结构简化为弹性简支梁和弹性支撑刚性梁的叠加,基于Euler(欧拉)梁理论给出悬浮隧道管段受迫振动时的运动方程,等效线性化处理动力方程非线性项;采用虚拟激励模拟随机地震输入,数值模拟平稳随机地震下水中悬浮隧道管体的动力响应,给出管段的位移功率谱.通过位移功率谱分析表明:随着消能连接装置阻尼系数和张力腿弹簧系数的增大,管段的动力响应减弱,其中张力腿的刚度对悬浮隧道管体的震动影响较为显著.The submerged floating tunnel stayed by tension legs was simplified as the superpo- sition of an elastic beam and an elastically supported rigid beam, the motion equations of forced vibration for the floating tunnel tube based on the Bernoulli-Euler beam theory were presented, then the nonlinear term of the dynamic equations was linearized equivalently. The pseudo excitation was input to simulate the random seismic impact and study the response of the submerged floating tunnel tube, with the displacement power spectrum at the middle point given and discussed detailedly. The displacement power spectrum analysis indicates that the displace- ment response of the tube decreases with the spring stiffness of the supporting tension legs and the damping coefficient of the energy dissipation devices, of which the former is of much higher significance.

关 键 词：水中悬浮隧道 管体 随机振动 虚拟激励法 动力响应 

分 类 号：U495.5[交通运输工程—交通运输规划与管理]