内波和海流联合作用下水中悬浮隧道动力响应及振动控制分析

发布时间：2018-01-28 17:13

本文关键词： 水中悬浮隧道内波海流 Morison公式动力响应振动控制　出处：《合肥工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：水中悬浮隧道是一种创新型交通跨越方式,在深海、超长距离、环境敏感等特殊水域地区,能有效的解决环境问题、降低工程造价以及具有优越的抗震特性。尽管目前全世界仍没有一座悬浮隧道建成,但其设计理念早已成为与传统交通方式(如跨海桥梁、沉管隧道和海底隧道)相竞争的一种富有吸引力的技术选择。作为一种创新技术,其借助水的浮力使封闭的管体结构悬浮在水中,并通过张力腿系统锚固在海床上,在海洋结构工程中悬浮隧道具有独特的优势。本文针对这一新型结构物,考虑了海洋环境内的两种典型荷载(内波和海流)的联合作用,分析研究了组合荷载作用下水中悬浮隧道的动力特性和力学行为,并以拟建工程为背景,对悬浮隧道进行了振动响应及控制分析,具体开展的工作包括：(1)基于势流函数理论建立了层化海洋内波流场,叠加海流流场形成联合作用场,采用Morison公式考虑内波和海流联合作用力,建立悬浮隧道-流体相互作用非线性振动数学物理模型。运用Galerkin法数值求解结构的振动方程,研究了海洋内波和海流共同作用及海流单独作用下水中悬浮隧道的多模态动力响应行为。(2)根据悬浮隧道拟建工程在联合作用下的动力响应特性,结合隧道结构本身和联合荷载的固有特性,提出了有效的减振措施。首先建立隧道管体的梁模型,将隧道模拟为简单梁和刚性梁的叠加梁,即振型近似为一个弯曲正弦模态和一个刚体模态的叠加；然后建立隧道结构与联合荷载之间的减振关系,控制由联合荷载导致的悬浮隧道的自由振动而非受迫振动来减小隧道的振动幅值,从而实现振动控制的目标：最后,通过对悬浮隧道拟建工程的减振响应的分析,验证和评价了减振措施的有效性,并对悬浮隧道的结构设计提出了参考性建议。
[Abstract]:Underwater suspended tunnel is an innovative way of traffic crossing. It can effectively solve environmental problems in special water areas such as deep sea, ultra-long distance, sensitive environment and so on. Although no suspension tunnel has been built in the world at present, its design concept has already become the traditional mode of transportation (such as bridge across the sea). As an innovative technology, the closed tube structure suspends in water by means of the buoyancy of water. And the tension leg system anchoring on the seabed, in the marine structure engineering suspension tunnel has a unique advantage. This paper aims at this new structure. Considering the combined action of two typical loads (internal wave and current) in the marine environment, the dynamic characteristics and mechanical behavior of underwater suspended tunnel under combined loads are analyzed and studied. The vibration response and control of suspended tunnel are analyzed. The specific work includes: 1) based on the theory of potential current function, the wave current field in stratified ocean is established, and the superposition current field forms the joint action field. The combined forces of internal wave and current are considered by Morison formula. A mathematical and physical model of nonlinear vibration of suspension tunnel-fluid interaction is established, and the Galerkin method is used to numerically solve the vibration equation of the structure. The multi-modal dynamic response behavior of underwater suspended tunnel under the interaction of ocean internal wave and current and the single action of ocean current is studied. (2) according to the dynamic response characteristics of the proposed project of the suspended tunnel under the combined action. Combined with the inherent characteristics of tunnel structure and combined load, the effective vibration reduction measures are put forward. Firstly, the beam model of tunnel tube body is established, and the tunnel is simulated as a superimposed beam of simple beam and rigid beam. That is, the mode shape is approximately a superposition of a bending sinusoidal mode and a rigid body mode. Then the vibration reduction relationship between the tunnel structure and the combined load is established to reduce the vibration amplitude of the tunnel by controlling the free vibration rather than the forced vibration of the suspended tunnel caused by the combined load. Finally, through the analysis of the vibration absorption response of the proposed project of suspension tunnel, the effectiveness of the vibration reduction measures is verified and evaluated, and the reference suggestions for the structure design of the suspension tunnel are put forward.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451

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