斜拉桥风致抖振与车桥耦合振动的MTMD减振方法研究

发布时间：2018-07-29 07:23

【摘要】：对于大跨度斜拉桥而言，风荷载和车辆荷载是引起其振动的主要因素，由此导致桥梁构件的疲劳，降低行车舒适度，必须对其振动进行控制。目前，TMD/MTMD是桥梁振动控制所采用的主要技术之一。但鉴于风致抖振与车桥耦合振动分析的复杂性，加之MTMD的参数优化具有一定难度，MTMD减振设计并不易为工程设计人员掌握。本文对港珠澳大桥上的青州航道桥和九州航道桥进行风致抖振和车桥耦合振动分析，并对基于MTMD的减振方法进行了研究，通过大量的数值计算和分析，给出了便于工程设计参考的MTMD控制方案。本文的主要工作包括： (1)系统地总结和回顾了TMD/MTMD的振动控制原理及其参数优化问题，分析比较TMD及MTMD的鲁棒性及控制效率。MTMD的鲁棒性和控制效率均优于TMD；在5种频率分布模式的MTMD中，Model-1有着最好的控制性能和工程实用性。 (2)利用ANSYS建立了青州航道桥有限元模型，采用频域方法对青州航道桥进行抖振分析，给出了MTMD系统的最优参数；采用时域方法计算并对比斜拉桥控制前后的响应，验证了MTMD对风致抖振控制的有效性。 (3)对车桥耦合振动响应的计算方法进行了研究，在传统分离迭代法的基础上，提出基于模态分析的分离迭代法；给出了在车辆荷载作用下MTMD系统的最优参数；并用自编程序对控制前后的车桥耦合振动经行分析，验证了MTMD对车桥耦合振动控制的有效性。 (4)以青州航道桥和九州航道桥为对象，通过数值计算和分析，讨论各因素对风致抖振及车桥耦合振动MTMD减振系统最优参数的影响，给出了便于工程应用的MTMD最优参数统一表达式。提出“相对效率”的概念，用于衡量桥梁在风荷载和车辆荷载共同作用下MTMD系统的综合控制效果，并给出了在基准条件下，，MTMD系统的最优参数。
[Abstract]:For a long-span cable-stayed bridge, wind load and vehicle load are the main factors causing its vibration, which leads to the fatigue of the bridge members and reduces the driving comfort, so the vibration must be controlled. At present, TMD / MTMD is one of the main techniques used in bridge vibration control. But in view of the complexity of wind-induced buffeting and vehicle-bridge coupling vibration analysis, and the difficulty of MTMD parameter optimization, the design of MTMD damping is not easy to be grasped by engineering designers. In this paper, the wind-induced buffeting and vehicle-bridge coupling vibration of Qingzhou Waterway Bridge and Jiuzhou Waterway Bridge on Hongkong-Zhuhai-Macao Bridge are analyzed, and the vibration reduction method based on MTMD is studied. The MTMD control scheme which is convenient for engineering design is given. The main work of this paper is as follows: (1) the vibration control principle and parameter optimization of TMD/MTMD are summarized and reviewed systematically. The robustness and control efficiency of TMD and MTMD are compared and compared. Among the five frequency distribution modes of MTMD, Model 1 has the best control performance and engineering practicability. (2) the finite element model of Qingzhou Waterway Bridge is established by using ANSYS, and the chattering analysis of Qingzhou Waterway Bridge is carried out by frequency domain method. The optimal parameters of MTMD system are given, and the response of cable-stayed bridge before and after control is calculated and compared with time domain method, which verifies the effectiveness of MTMD in wind-induced buffeting control. (3) the calculation method of vehicle-bridge coupling vibration response is studied. On the basis of the traditional separation iteration method, the separation iteration method based on modal analysis is proposed, the optimal parameters of MTMD system under vehicle load are given, and the longitudinal analysis of vehicle-bridge coupling vibration before and after control is carried out with a self-compiled program. The effectiveness of MTMD in controlling vehicle-bridge coupling vibration is verified. (4) taking Qingzhou Waterway Bridge and Jiuzhou Waterway Bridge as objects, numerical calculation and analysis are carried out. The influence of various factors on the optimal parameters of wind-induced buffeting and vehicle-bridge coupled vibration MTMD damping system is discussed. The unified expression of MTMD optimal parameters for engineering application is given. This paper presents the concept of "relative efficiency", which is used to measure the comprehensive control effect of MTMD system under the combined action of wind load and vehicle load, and gives the optimal parameters of the system under the condition of reference.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3

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