考虑管段连接作用下悬浮隧道的动力行为研究
发布时间：2018-10-04 20:40
【摘要】：水中悬浮隧道（Submerged Floating Tunnel,简称“SFT”），又名阿基米德桥，是跨越深水域的新交通方式。它固定在水面以下，借助浮力、张力腿拉力和自重悬浮在水底和两岸，，以防浮出水面，桥顶距水面保持20米以上的距离，以便大吨位船只通行。一般由浮在水中一定深度的管状结构、锚固在水下基础的锚固系统或水上的浮箱装置及与两岸相连的构筑物组成。它是一种新的跨越海峡、大江湖泊、水道的交通结构物。 在过去数年里，众多科研工作者已经对悬浮隧道管体、锚固系统、管体和锚索耦合模型的动力响应做了研究。很少有将将悬浮隧道简化成一个两端支座处带有弹簧和阻尼的弹性支撑梁来进行研究。在此篇论文中，主要的研究工作集中于稳定流中涡激振动和移动荷载作用下的弹性支撑的悬浮隧道的动力响应。在这个过程中，悬浮隧道被简化成一个简支弹性梁和一个具有弹簧和阻尼支撑的刚性梁的叠加。通过数值模拟来研究弹性支撑的弹簧刚度和阻尼，以及移动荷载大小和移动速度对悬浮隧道动力特性的影响。 本文的主要具体的研究内容如下： (1)考虑均匀流中涡激振动作用下，将悬浮隧道简化成一个两端支座处带有弹簧和阻尼的弹性支撑梁，建立悬浮隧道在涡激振动作用下的结构动力方程。通过伽辽金法和模态叠加法求解方程，利用Matlab工具数值模拟得到了悬浮隧道的时程位移图形。通过对悬浮隧道的时程位移图形分析获得涡激振动作用下水中悬浮隧道管体的动力特性，以弹性支撑的弹簧刚度和阻尼对其位移的影响作用。 (2)仍以管体系统为研究对象，建立了管体在移动荷载作用下的的振动模型。通过伽辽金法和模态叠加法求解系统的振动微分方程，利用Matlab工具对悬浮隧道的位移进行数值模拟，分析得出悬浮隧道在不同大小和不同速度荷载，以及弹性支撑的刚度和阻尼对其位移的影响。
[Abstract]:Underwater suspended Tunnel (Submerged Floating Tunnel,), also known as Archimedes Bridge, is a new mode of transportation across deep waters. It is fixed below the water surface, with the aid of buoyancy, tension leg pull force and weight suspended in the bottom and the banks, in case of surfacing, the top of the bridge keeps a distance of more than 20 meters from the water surface for the passage of large tonnage ships. Generally, it consists of pipe structure of certain depth, anchoring system of underwater foundation, floating box device and structure connected with both sides. It is a new traffic structure across straits, rivers, lakes and waterways. In the past few years, many researchers have studied the dynamic response of suspended tunnel tube, anchoring system, pipe and cable coupling model. It is rare to simplify the suspension tunnel into an elastic beam with spring and damping at both ends of the support. In this paper, the main work is focused on the dynamic response of a suspended tunnel supported by elastic braces under vortex-induced vibration and moving load in a steady flow. In this process, the suspended tunnel is simplified as a superposition of a simply supported elastic beam and a rigid beam with spring and damping support. The spring stiffness and damping of elastic braces and the effects of moving load and moving velocity on the dynamic characteristics of suspension tunnel are studied by numerical simulation. The main contents of this paper are as follows: (1) considering the vortex-induced vibration in uniform flow, the suspension tunnel is simplified into an elastic supporting beam with spring and damping at both ends of the support. The structure dynamic equation of suspension tunnel under vortex-induced vibration is established. By Galerkin method and modal superposition method, the time-history displacement pattern of the suspended tunnel is obtained by using the Matlab tool. By analyzing the time-history displacement pattern of the suspension tunnel, the dynamic characteristics of the tube body under the vortex-induced vibration are obtained, and the effects of spring stiffness and damping of elastic support on the displacement are obtained. (2) the vibration model of pipe body under moving load is established. By Galerkin method and modal superposition method, the vibration differential equation of the system is solved, and the displacement of the suspended tunnel is simulated by Matlab tool. The results show that the suspension tunnel is loaded with different sizes and velocities. And the influence of stiffness and damping of elastic bracing on its displacement.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U459.5
本文编号：2251810
[Abstract]:Underwater suspended Tunnel (Submerged Floating Tunnel,), also known as Archimedes Bridge, is a new mode of transportation across deep waters. It is fixed below the water surface, with the aid of buoyancy, tension leg pull force and weight suspended in the bottom and the banks, in case of surfacing, the top of the bridge keeps a distance of more than 20 meters from the water surface for the passage of large tonnage ships. Generally, it consists of pipe structure of certain depth, anchoring system of underwater foundation, floating box device and structure connected with both sides. It is a new traffic structure across straits, rivers, lakes and waterways. In the past few years, many researchers have studied the dynamic response of suspended tunnel tube, anchoring system, pipe and cable coupling model. It is rare to simplify the suspension tunnel into an elastic beam with spring and damping at both ends of the support. In this paper, the main work is focused on the dynamic response of a suspended tunnel supported by elastic braces under vortex-induced vibration and moving load in a steady flow. In this process, the suspended tunnel is simplified as a superposition of a simply supported elastic beam and a rigid beam with spring and damping support. The spring stiffness and damping of elastic braces and the effects of moving load and moving velocity on the dynamic characteristics of suspension tunnel are studied by numerical simulation. The main contents of this paper are as follows: (1) considering the vortex-induced vibration in uniform flow, the suspension tunnel is simplified into an elastic supporting beam with spring and damping at both ends of the support. The structure dynamic equation of suspension tunnel under vortex-induced vibration is established. By Galerkin method and modal superposition method, the time-history displacement pattern of the suspended tunnel is obtained by using the Matlab tool. By analyzing the time-history displacement pattern of the suspension tunnel, the dynamic characteristics of the tube body under the vortex-induced vibration are obtained, and the effects of spring stiffness and damping of elastic support on the displacement are obtained. (2) the vibration model of pipe body under moving load is established. By Galerkin method and modal superposition method, the vibration differential equation of the system is solved, and the displacement of the suspended tunnel is simulated by Matlab tool. The results show that the suspension tunnel is loaded with different sizes and velocities. And the influence of stiffness and damping of elastic bracing on its displacement.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U459.5
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