悬浮隧道管体及锚索耦合作用的涡激动力响应  

Vortex-induced dynamic response for combined action of tube and cable of submerged floating tunnel

作　　者：项贻强 晁春峰[1] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2012年第3期409-415,共7页Journal of Zhejiang University：Engineering Science

摘　　要：为了解决悬浮隧道在水流作用下的动力响应问题,对管体及锚索系统的参数振动和涡激振动进行了研究.利用Hamilton原理,通过综合考虑悬浮隧道管体和锚索系统的耦合振动效应,推导了锚索-管体耦合系统运动的微分方程组,采用变量分离及振型叠加法对其进行求解简化,同时对5种典型工况和参数设置下的锚索跨中位置和管体跨中位置的位移时程曲线进行了计算和比较,分析了悬浮隧道锚索-管体耦合系统振动的非线性特性.结果表明:锚索与管体之间耦合振动呈现"拍"的特征,管体的初始扰动对锚索瞬态振幅有很大影响,锚索的涡激振动能激发系统的参数振动,系统稳态振幅取决于涡激力的大小,锚索合理倾斜角在45o～60o之间.The vortex-induced vibration and parametric vibration of tube and cables were studied in order to solve the dynamic response of submerged floating tunnel（SFT） under current.The differential equations of tube and cables coupled motion were set up using Hamilton principle,taking the coupling effect between cable lateral vibration and tube vertical vibration into account.The semi-analytical solution was presented by using the variable separation approach and the modal superposition method.The displacement curves at the mid-span section of cables and tube were calculated under five kinds of typical work conditions and parameter settings.The nonlinear vibration characteristics about cable and tube coupling system of SFT were analyzed.The results show that the coupling vibration between cable and tube is obvious,the cable transient amplitude is significantly affected by the initial disturbance of tube,the parametric vibration of the whole system can be induced by the vortex-induced vibration of cables,the steady-state amplitude of SFT depends on the vortex-induced vibration,and the cable reasonable angle is between 45° and 60°.

关 键 词：悬浮隧道 涡激振动 振型叠加法 NEWMARK法 

分 类 号：U459[建筑科学—桥梁与隧道工程]