【摘要】：對于大跨度斜拉橋而言，風荷載和車輛荷載是引起其振動的主要因素，由此導致橋梁構件的疲勞，降低行車舒適度，必須對其振動進行控制。目前，TMD/MTMD是橋梁振動控制所采用的主要技術之一。但鑒于風致抖振與車橋耦合振動分析的復雜性，加之MTMD的參數優(yōu)化具有一定難度，MTMD減振設計并不易為工程設計人員掌握。本文對港珠澳大橋上的青州航道橋和九州航道橋進行風致抖振和車橋耦合振動分析，并對基于MTMD的減振方法進行了研究，通過大量的數值計算和分析，給出了便于工程設計參考的MTMD控制方案。本文的主要工作包括： (1)系統地總結和回顧了TMD/MTMD的振動控制原理及其參數優(yōu)化問題，分析比較TMD及MTMD的魯棒性及控制效率。MTMD的魯棒性和控制效率均優(yōu)于TMD；在5種頻率分布模式的MTMD中，Model-1有著最好的控制性能和工程實用性。 (2)利用ANSYS建立了青州航道橋有限元模型，采用頻域方法對青州航道橋進行抖振分析，給出了MTMD系統的最優(yōu)參數；采用時域方法計算并對比斜拉橋控制前后的響應，驗證了MTMD對風致抖振控制的有效性。 (3)對車橋耦合振動響應的計算方法進行了研究，在傳統分離迭代法的基礎上，提出基于模態(tài)分析的分離迭代法；給出了在車輛荷載作用下MTMD系統的最優(yōu)參數；并用自編程序對控制前后的車橋耦合振動經行分析，驗證了MTMD對車橋耦合振動控制的有效性。 (4)以青州航道橋和九州航道橋為對象，通過數值計算和分析，討論各因素對風致抖振及車橋耦合振動MTMD減振系統最優(yōu)參數的影響，給出了便于工程應用的MTMD最優(yōu)參數統一表達式。提出“相對效率”的概念，用于衡量橋梁在風荷載和車輛荷載共同作用下MTMD系統的綜合控制效果，并給出了在基準條件下，，MTMD系統的最優(yōu)參數。
[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.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441.3

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本文編號：2151941