深水高桩承台连续梁桥地震反应分析及抗震性能评估

发布时间：2018-04-09 07:50

本文选题：高桩承台连续梁桥　切入点：动水压力　出处：《兰州交通大学》2015年硕士论文

【摘要】：随着我国经济的迅速发展,桥梁建设在向大跨度发展的同时,也出现了许多深水桥梁。由于深水桥梁都面临较深的河水和软弱的沉积岩,而桩基础能够穿透土层而达到较深的持力层,同时连续梁桥具有刚度大、变形小、行车平稳舒适等突出优点,故深水高桩承台连续梁桥被广泛应用到深水桥梁建设中。由于深水高桩承台连续梁桥地震反应的复杂性以及震后修复困难,因此对其进行研究十分必要。本文以某深水高桩承台连续梁桥为工程背景,考虑动水压力效应,对其进行地震反应分析及抗震性能评估。主要研究工作如下:(1)通过查阅大量国内外桥梁结构与水相互作用的文献,详细介绍了深水桥梁的地震震害;水对桥梁下部结构的动水压力作用采用Morison方程等效为附加质量考虑。(2)对深水高桩承台连续梁桥进行模态分析,讨论动水压力作用对深水高桩承台连续梁桥动力特性的影响,并给出其在考虑动水压力作用下的前七阶自振频率及振型。(3)在E1地震下,对深水高桩承台连续梁桥进行反应谱分析,讨论动水压力作用对非水中桥墩和水中桥墩及桩身弯矩的影响,并对非水中桥墩和水中桥墩及桩基础的抗震性能进行评估。(4)在E2地震下,对深水高桩承台连续梁桥进行弹塑性时程分析,并对非水中桥墩和水中桥墩及桩基础的抗震性能进行评估。(5)采用摩擦摆减隔震支座对深水高桩承台连续梁桥进行减隔震设计,通过对摩擦摆减隔震支座进行参数分析,研究了摩擦摆减隔震支座滑动曲面半径、摩擦系数对墩底峰值弯矩、支座位移的影响。研究了摩擦摆减隔震支座的减震效果,并对非水中桥墩和水中桥墩及桩基础的抗震性能进行评估。
[Abstract]:With the rapid development of China's economy, many deep-water bridges have emerged while the bridge construction is developing to a large span.Because deep-water bridges are faced with deeper river water and weak sedimentary rock, pile foundation can penetrate the soil layer to reach deeper bearing layer, and continuous beam bridge has many outstanding advantages, such as high stiffness, small deformation, smooth and comfortable running, etc.Therefore, deep-water continuous beam bridge with high pile cap is widely used in deep water bridge construction.Because of the complexity of seismic response and the difficulty of post-earthquake repair of continuous beam bridge with high pile cap in deep water, it is necessary to study it.In this paper, the seismic response analysis and seismic performance evaluation of a continuous beam bridge with high pile cap in deep water are carried out considering the effect of hydrodynamic pressure.The main research work is as follows: (1) the earthquake damage of deep water bridge is introduced in detail by consulting a large number of literatures on the interaction between bridge structure and water at home and abroad.The effect of water on the dynamic water pressure of the bridge understructure is equivalent to the consideration of additional mass by Morison equation. The modal analysis of deep water high pile cap continuous beam bridge is carried out, and the effect of dynamic water pressure on the dynamic characteristics of deep water high pile cap continuous beam bridge is discussed.The first seven natural frequencies and vibration modes of the bridge under dynamic water pressure are given. Under E1 earthquake, the response spectrum of continuous beam bridge with high pile cap in deep water is analyzed.This paper discusses the effect of hydrodynamic pressure on bending moment of bridge pier and bridge pier and pile body in water, and evaluates the seismic behavior of bridge pier and bridge pier and pile foundation under E _ 2 earthquake.The elastoplastic time history analysis of deep water continuous beam bridge with high pile cap is carried out, and the seismic performance of non-water pier and water pier and pile foundation are evaluated.The influence of sliding surface radius and friction coefficient on the peak bending moment and displacement of the base of the abutment are studied by analyzing the parameters of the frictional pendulum isolation bearing.In this paper, the seismic absorption effect of friction pendulum abutment is studied, and the seismic performance of non-water piers, underwater piers and pile foundations is evaluated.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55

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