摘要
随着现代交通网络的发展,桥梁已经充当该生命线工程中的枢纽角色。近些年来,随着桥梁设计和建造技术的发展,大跨度斜拉桥和悬索桥已经成为一种主要的桥梁结构形式。桥塔作为斜拉桥和悬索桥的主要结构部分,也伴随材料和施工技术的进步,变的越来越高和越来越柔,其施工过程中的风激振动已经成为影响结构安全的重要方面。
调频质量阻尼器(TMD)是一种抑制桥塔等高耸结构风激振动的,具有优良控制效果的控制装置。然而,TMD的控制性能与结构的频率特性密切相关。目前,大多数高耸结构的TMD控制在设计过程中,都假定结构底部与基础固结,没有考虑土-结构相互作用。因此,为了提高和保障TMD的控制效果,有必要分析桩-土结构相互作用对结构频率特性以及TMD控制系统的影响。
本文以南京三桥为工程背景,研究了该桥桥塔的风激振动,以及桩-土相互作用对TMD控制效果的影响。主要研究内容包括:
1.利用ANSYS有限元分析软件建立塔底固结的桥塔模型,分析结构在脉动风作用下的结构响应,从探讨桥塔结构的风振影响。
2.针对南京三桥桥塔,设计了TMD控制系统,并对安装TMD控制系统的桥塔结构进行了分析。
3.利用集中质量法建立考虑层间相互作用的桩-土-桥塔模型,对该有限元模型进行风振响应分析,研究和比较了桩-土相互作用对TMD控制效果的影响。
With the development of the modern traffic network, bridge has played the important role in the whole lifeline of the society. Recentiy, long-span cable-stayed bridge and suspension bridge have become the popular bridges with the development of bridge design and construction technology. The pylon tower of those bridges is sensitive to the wind in construction stage, as the structure of pylon tower has been changed taller and more flexible with.the advancement of material and construction technology,
TMD is an effective control device to suspress the wind-induced vibration of the taller structures, such as pylon tower. However, the TMD system is sensitive to the frequency variation. At present, it is generally assumed that the base is fixed in the grond in the design of the system, without regarding to the pile-soli interaction. To make the system effectiveness, it is necessary to analyze the effect of the pile-soil-structure interaction to the performance of the TMD system.
This paper investigates the wind-induced vibration responses of the pylon tower of the Third Nanjing Yangtse Cable-stayed Bridge, and the effects of pile-soil interaction on wind-induced vibration control of the structure with TMD system.The following items will be investigated:
1. The ANSYS finite element code is utilized for establishing the pylon tower model with bottom fixed in the ground. The wind-induced vibration response of the pylon tower and the effects of the wind-induced vibration of the pylon tower are analyzed.
2. The TMD control system of the Third Nanjing Yangtse Bridge is designed. The performance of the TMD system for suppressing the wind-induced vibration of the pylon tower is also investigated.
3. The pile-soil-tower interaction model with the Concentration Mass Method is established. The wind-induced vibration of the structural considering the pile-soil-tower interaction is also conducted.
引文
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