随机地震激励作用下水中悬浮隧道锚索的动力响应  

Dynamic response of submerged floating tunnel's anchor cable to random seismic excitation

作　　者：董满生[1,2,3] 赵佳佳[2] 牛忠荣[1] 耿淑伟[1] 

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]合肥工业大学交通运输工程学院,安徽合肥230009 [3]上海交通大学海洋工程国家重点实验室,上海200240

出　　处：《合肥工业大学学报（自然科学版）》2013年第1期74-78,共5页Journal of Hefei University of Technology：Natural Science

基　　金：中国博士后科学基金特别资助项目(201003274);中国博士后科学基金资助项目(20110490833)

摘　　要：文章采用Morison公式,考虑水体对结构动力响应的影响,建立地震作用下水中悬浮隧道锚索的非线性动力方程;运用振型分解法求解结构动力方程系列解,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,数值模拟随机地震下水中悬浮隧道锚索的动力响应,给出锚索的位移和速度功率谱;通过位移和速度功率谱分析可得随机地震激励作用下水中悬浮隧道锚索的动力行为。Nonlinear dynamic equation of anchor cable of submerged floating tunnel（SFT） was estab- lished, where Morison formula was applied to taking the influence of water upon structure dynamic response into consideration. The series solutions of structure dynamic equation were obtained based on modal decomposition method, and the nonlinear terms of dynamic equation were simplified by e- quivalent linearization method. The dynamic response of SFT＇s anchor cable to random seismic excita- tion was simulated by virtual and motivating method, and the displacement and velocity power spec- trums of anchor cable were presented. The dynamic behavior of SFT＇s anchor cable under random seismic excitation was achieved by analyzing the displacement and the velocity power spectra.

关 键 词：水中悬浮隧道 锚索 随机地震 虚拟激励 几何非线性 

分 类 号：U459.5[建筑科学—桥梁与隧道工程]