张力腿型悬浮隧道涡激响应影响因素分析  

Analysis of the Influencing Factors of Vortex-induced Vibration Response of the Submerged Floating Tunnel Supported by Tension Leg

作　　者：秦银刚[1] 周晓军[1] 

机构地区：[1]西南交通大学,成都610031

出　　处：《铁道工程学报》2009年第1期77-81,共5页Journal of Railway Engineering Society

基　　金：国家自然科学基金资助项目(10572121);霍英东教育基金资助项目(94024)

摘　　要：研究目的:将多跨悬浮隧道管段简化为作用在锚索端部的集中质量。根据舒适性要求,假定悬浮隧道是小振幅运动。不考虑悬浮隧道张力腿自身的涡激振动对悬浮隧道管段的影响时,在横流向涡激升力作用下建立悬浮隧道垂直于流向的振动方程。将倾斜式张力腿等效成水平张力腿和垂直张力腿。仅考虑悬浮隧道做垂直于流向振动,对于作用于悬浮隧道上的张力腿作用力。将作用于悬浮隧道上的涡激作用力简化为简谐荷载。采用龙格-库塔积分法对振动方程进行了数值求解,并利用MATLAB程序对不同参数情况进行模拟。着重研究了张力腿结构性质的变化对悬浮隧道动力响应的影响。研究结论:研究结果表明,张力腿与海底水平面的夹角对响应影响并不大,张力腿的轴向刚度和初始张力对响应有相同的规律。Research purposes： This paper studies the effect of property change of tension leg structure on the dynamic response of submerged floating tunnel with the following methods： It is to simplify the multi - span submerged floating tunnel into the concentrated mass which acts at the end of the anchor cable, supposing the submerged floating tunnel has a little amplitude dynamic vibration for meeting the need of usage comfortableness. When the effect of the vortex - induced vibration of tension leg on submerged floating tunnel structure is not taken into account, the equation for submerged floating tunnel vibration is established under the effect of cross current vortex - induced vibration and the slope tension leg is equalized into horizontal tension leg and vertical tension leg. If it only considers the submerged floating tunnel vibration crosses the current and the load acts at the anchor cable, it is to simplify the fluid force into tune load. Using Runge- Kutta numerical method solves the vibration equation and the different cases are simulated with MATLAB program. Research conclusions：The study result shows that the angle between the anchor cable and the bottom of the ocean has little effect on the dynamic response, and the response law of the tension leg＇s axis stiff is the same as initial tension.

关 键 词：悬浮隧道 张力腿 涡激 响应 数值 

分 类 号：U45[建筑科学—桥梁与隧道工程]