市域铁路隔震桥梁的地震响应分析
发布时间：2018-07-21 16:36
【摘要】：地震是日常生活中破坏力最强的自然灾害之一,桥梁在地震作用下发生倒塌的案例屡有发生，因此对桥梁进行抗震设计，必须严格执行的，减隔震技术是近些年来桥梁抗震的新技术之一，在桥墩和上部结构之间设置减隔震支座是最常见的桥梁减隔震技术，，减隔震支座通过延长桥梁的自振周期，避开地震能量集中的范围，从而降低桥梁受到的地震力。减隔震支座同时也可以利用自身材料的特点耗散桥梁的地震总输入能，保证桥梁主体结构的安全性。因此对减隔震支座进行相关研究是非常有必要的。本文利用动力时程分析和能量法原理，利用Ansys有限元软件对三座不同类型的桥梁进行建模和动力分析，重点研究减隔震支座对桥梁抗震的影响，包括以下内容： 1.总结桥梁震害的类型和现象，通过桥梁震害得出启示，介绍几种新的桥梁抗震技术，重点介绍其中的桥梁减隔震技术。 2.介绍了动力时程分析Newmark-β法公式的推导过程和计算方法，又介绍了能量法的产生发展过程和基本原理，推导了单自由度和多自由度下的能量法原理基本方程。详细说明了能量方程中各部分所代表的能量意义。 3.通过Ansys软件对三座不同类型的桥梁进行建模和动力分析，以能量法原理为理论基础，对减隔震支座初始参数设置优化条件，输入不同的地震波，计算出在同一座桥梁在不同支座参数下的地震总输入能，以使地震总输入能最小的支座参数为我们设计所需要的最终支座参数。 4.将已经确定的支座参数作为三座桥梁上应用的减隔震支座的参数，并对非隔震状态下的桥梁进行建模和动力分析，提取同一座桥梁上典型位置的响应，通过对比隔震状态下和非隔震状态下的响应的大小关系，算出隔震率，以此来比较说明隔震支座对于桥梁抗震的影响。 5.介绍了行波效应产生的原因和地震波输入的两种计算方式。通过计算和分析响应结果，比较两种计算方式的对于大跨连续梁桥抗震计算的区别和联系。最后通过延长地震波的输入时间来模拟行波效应对大跨连续梁桥进行动力分析，提取典型位置的响应，通过对比来分析行波效应对于大跨连续梁桥的影响。
[Abstract]:Earthquake is one of the most destructive natural disasters in daily life, and the bridge collapses frequently under the action of earthquake. Therefore, the seismic design of bridges must be strictly carried out. Seismic isolation technology is one of the new seismic techniques in recent years. It is the most common technology to install the isolation support between the pier and the superstructure, which extends the natural vibration period of the bridge. Avoid the range of seismic energy concentration, thus reducing the earthquake force to the bridge. At the same time, the isolation support can dissipate the total seismic input energy of the bridge and ensure the safety of the main structure of the bridge. Therefore, it is necessary to study the isolation bearing. In this paper, the dynamic time-history analysis and energy method are used to model and analyze three different types of bridges by using Ansys finite element software. The influence of the isolation bearing on the seismic resistance of the bridge is studied emphatically, including the following contents: 1. This paper summarizes the types and phenomena of bridge earthquake damage, draws inspiration from bridge earthquake damage, introduces several new bridge seismic techniques, and focuses on the bridge seismic isolation technology. 2. This paper introduces the derivation process and calculation method of Newmark- 尾 method for dynamic time history analysis, introduces the development process and basic principle of energy method, and deduces the basic equation of energy method principle under single degree of freedom and multiple degrees of freedom. The energy meaning represented by each part of the energy equation is explained in detail. 3. Three different types of bridges are modeled and analyzed by Ansys software. Based on the theory of energy method, the initial parameters of isolation support are optimized and different seismic waves are input. The total seismic input energy of the same bridge under different support parameters is calculated, so that the bearing parameters with the smallest total seismic input energy are the final support parameters that we need to design. The determined support parameters are taken as the parameters of the isolation bearings applied on three bridges, and the model and dynamic analysis of the bridges in non-isolated state are carried out to extract the response of the typical position on the same bridge. The isolation rate is calculated by comparing the response size relationship between the isolated state and the non-isolated state, and the effect of the isolation support on the seismic resistance of the bridge is compared. 5. The cause of traveling wave effect and two calculating methods of seismic wave input are introduced. By calculating and analyzing the response results, the difference and relation between the two calculation methods for seismic calculation of long-span continuous beam bridges are compared. Finally, the dynamic analysis of long-span continuous beam bridge is simulated by prolonging the input time of seismic wave, and the response of typical position is extracted, and the effect of traveling wave effect on long-span continuous beam bridge is analyzed by comparison.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55
本文编号：2136133
[Abstract]:Earthquake is one of the most destructive natural disasters in daily life, and the bridge collapses frequently under the action of earthquake. Therefore, the seismic design of bridges must be strictly carried out. Seismic isolation technology is one of the new seismic techniques in recent years. It is the most common technology to install the isolation support between the pier and the superstructure, which extends the natural vibration period of the bridge. Avoid the range of seismic energy concentration, thus reducing the earthquake force to the bridge. At the same time, the isolation support can dissipate the total seismic input energy of the bridge and ensure the safety of the main structure of the bridge. Therefore, it is necessary to study the isolation bearing. In this paper, the dynamic time-history analysis and energy method are used to model and analyze three different types of bridges by using Ansys finite element software. The influence of the isolation bearing on the seismic resistance of the bridge is studied emphatically, including the following contents: 1. This paper summarizes the types and phenomena of bridge earthquake damage, draws inspiration from bridge earthquake damage, introduces several new bridge seismic techniques, and focuses on the bridge seismic isolation technology. 2. This paper introduces the derivation process and calculation method of Newmark- 尾 method for dynamic time history analysis, introduces the development process and basic principle of energy method, and deduces the basic equation of energy method principle under single degree of freedom and multiple degrees of freedom. The energy meaning represented by each part of the energy equation is explained in detail. 3. Three different types of bridges are modeled and analyzed by Ansys software. Based on the theory of energy method, the initial parameters of isolation support are optimized and different seismic waves are input. The total seismic input energy of the same bridge under different support parameters is calculated, so that the bearing parameters with the smallest total seismic input energy are the final support parameters that we need to design. The determined support parameters are taken as the parameters of the isolation bearings applied on three bridges, and the model and dynamic analysis of the bridges in non-isolated state are carried out to extract the response of the typical position on the same bridge. The isolation rate is calculated by comparing the response size relationship between the isolated state and the non-isolated state, and the effect of the isolation support on the seismic resistance of the bridge is compared. 5. The cause of traveling wave effect and two calculating methods of seismic wave input are introduced. By calculating and analyzing the response results, the difference and relation between the two calculation methods for seismic calculation of long-span continuous beam bridges are compared. Finally, the dynamic analysis of long-span continuous beam bridge is simulated by prolonging the input time of seismic wave, and the response of typical position is extracted, and the effect of traveling wave effect on long-span continuous beam bridge is analyzed by comparison.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55
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