基底摇摆隔震桥墩的地震反应研究

发布时间：2018-02-24 18:51

本文关键词： 空心高墩摇摆隔震碰撞效应地震反应　出处：《兰州交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：在罕遇地震下，基底摇摆隔震桥墩可在桥墩与基础的分离面处发生摆动，，由摆动过滤部分地震能量，以达到在地震中不仅可以保护基础，同时又保护桥墩的目的。本文对基底摇摆隔震桥墩的地震反应进行研究，主要研究工作如下： (1)介绍了国内外学者对基底隔震的研究成果，总结了减隔震控制类型及各自的特点。 (2)阐述了减隔震装置的基本原理，介绍了减隔震体系的优点，在强震来临时，通过隔震层降低了地震动对上部结构的影响，上部结构可以正常使用，确保建筑物在地震中的安全和震后无需修复，经济可行等特点。 (3)介绍了几种主要碰撞模型的优缺点，采用可以考虑碰撞过程中能量损失的Kelvin模型和Maxwell模型。建立了考虑碰撞效应的基底摇摆隔震桥墩的计算模型及运动方程。分析了模型中连接弹簧刚度以及阻尼系数的计算方法与取值范围。 (4)以新建铁路大理至瑞丽线漾濞1号特大桥为工程背景，采用midas-civil有限元软件建立了单墩分析模型，计算了结构自振特性。 (5)对考虑碰撞效应的基底摇摆隔震桥墩，进行了罕遇地震作用下的非线性时程反应分析，并分别与不考虑碰撞效应的两弹簧模型以及传统的高墩模型进行了比较。 (6)重点研究了Kelvin模型和Maxwell模型中弹簧刚度和阻尼系数的取值对摇摆隔震桥墩地震反应的影响，分析了两种模型在强震下地震反应的差异。在两弹簧模型的基础上，提出了考虑碰撞效应的基底摇摆隔震桥墩合理的减隔震分析模型。
[Abstract]:Under the rare earthquake, the base rocking isolated bridge pier can swing at the separate surface of the bridge pier and the foundation, and some seismic energy can be filtered by the swing, so that not only the foundation can be protected in the earthquake, At the same time, the purpose of protecting the pier is to study the seismic response of the base rocking isolated pier. The main research work is as follows:. 1) the research results of base isolation are introduced, and the control types and characteristics of base isolation are summarized. (2) the basic principle of the isolation device is expounded, and the advantages of the isolation system are introduced. When the strong earthquake comes, the influence of ground motion on the superstructure is reduced through the isolation layer, and the superstructure can be used normally. To ensure the safety of buildings in the earthquake and the characteristics of no need to repair after the earthquake, economic feasibility and so on. The advantages and disadvantages of several main collision models are introduced. Using Kelvin model and Maxwell model which can consider energy loss during collision, the calculation model and motion equation of base rocking isolated pier considering collision effect are established. The stiffness and damping system of connecting spring in the model are analyzed. The method of calculating the number and the range of the value. Taking Yangbi No. 1 Bridge from Dali to Ruili Line as the engineering background, the analysis model of single pier is established by using midas-civil finite element software, and the natural vibration characteristics of the structure are calculated. The nonlinear time-history response of the base rocking isolated pier considering the impact effect is analyzed and compared with the two spring model without collision effect and the traditional high pier model. (6) the influence of spring stiffness and damping coefficient on seismic response of rocking isolated bridge pier in Kelvin model and Maxwell model is studied, and the difference between the two models under strong earthquake is analyzed. A reasonable shock isolation analysis model for base rocking isolated bridge pier considering collision effect is proposed.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3

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