连续刚构桥抗震影响分析

发布时间：2018-03-15 04:16

本文选题：连续刚构桥　切入点：地震响应　出处：《武汉理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：伴随着我国经济迈入高速发展的轨道,我国交通网络的发展也迅猛起来。现在大批桥梁正在国内建造,连续刚构桥因其独有的特点成为很多桥梁设计首选桥型。我国所处地理环境决定了其地震情况的复杂性。中国的地震活动特点是广分布、大强度、高频率、浅震源,一旦发生地震灾害,损害将会非常严。桥梁工程作为生命线工程,其抗震能力应该引起我们足够的重视。本文以正在建设中的某高速公路大桥为依据,建立该连续刚构桥的结构计算模型,分析该连续刚构桥的地震响应特性。按照我国先行实施的抗震设计规范对该桥在E1和E2地震作用下地震响应进行分析,得出大跨径连续刚构桥的地震响应特点。分析对比反应谱法和时程分析法两者的运算结果,得出哪一种模拟方法对抗震分析更有参考价值。本文的主要内容如下:1、概括了包括静力法、反应谱法和动态时程分析法桥梁结构分析方法,阐述了桥梁结构抗震设计流程、基本思想方法以及地震输入过程中要注意的事项;2、计算该桥在E1和E2地震作用下地震响应,并提取前30阶振型进行分析。通过对所得桥梁阵型分析可知:前两阶阵型对该桥影响比较大,其第一阶阵型以纵向漂移为主,第二阶阵型以横弯为主;3、采用反应谱法计算该桥在E1和E2地震作用下地震响应,得出结构分别在E1、E2地震作用下主梁、桥墩各控制截面内力和各墩顶位移。比较结构在E1、E2地震作用下产生的内力和位移大小;4、根据大桥所在地区的特征周期,选取了三条周期与场区特征周期相近的地震波进行反应时程分析。并且通过结构抗震设防烈度和E2地震作用下反应谱最大加速度峰值对地震波进行一个系数调整。利用Midas软件分别用三种地震波对结构进行地震剪力、弯矩、位移以及变形等分析;5、分析对比结构分别在反应谱法和时程反应分析法两种计算方法得出的各控制截面内力和位移。最后经过对比选取两者之间的较大值或者是两者的平均值。
[Abstract]:Along with China's economy entered a rapid development track, the development of China's transportation network is also rapidly. Now a large number of bridges are domestic construction, the continuous rigid frame bridge because of its unique features as the preferred bridge design many bridges. China's geographical environment determines the complexity of the earthquake. The seismic activity characteristics of Chinese is widely distributed high strength, high frequency, light source, once the earthquake occurred, the damage will be very strict. Bridges are lifeline engineering, its seismic capacity should arouse our attention. In this paper, a highway bridge under construction is on the basis of the model structure for the establishment of the continuous rigid frame bridge, analysis of the response characteristics of the continuous rigid frame bridge according to the China earthquake. The seismic design specification of the first implementation of the bridge seismic response in E1 and E2 seismic analysis, the long-span continuous rigid frame bridge The seismic response characteristics. The comparative analysis of response spectrum method and time history analysis method the calculation results, which reached a simulation method to analyze more reference value for the earthquake. The main contents of this paper are as follows: 1. Summarized including static method, response spectrum method and dynamic time history analysis method of bridge structure analysis method, described bridge structure seismic design process should pay attention to the basic idea and method of earthquake input in the process; 2, the calculation of seismic response of the bridge in E1 and E2 under the action of earthquake, and extract the first 30 modes were analyzed. Through the analysis of the bridge can be known before the two formation: the order of formation of the bridge is relatively large. The first order of formation in the longitudinal drift, second order formation in transverse bending; 3, the calculation of seismic response of the bridge in E1 and E2 under the earthquake using the response spectrum method, obtains the structure respectively in E1, E2 under the earthquake of the control section in the main girder, pier The force and displacement of the top of the pier. The structure in E1, internal force and displacement size E2 under earthquake; 4, according to the characteristic period of bridge area, select the three cycle similar to the characteristic period of seismic wave field response time history analysis. And through the seismic fortification intensity and E2 under earthquake the maximum acceleration response spectrum peak is adjusted to a coefficient of seismic wave. With three kinds of seismic waves on the structure of the seismic shear force, bending moment by using Midas software, analysis of displacement and deformation; 5, comparative analysis of structure in each control section internal force and displacement response spectrum method and time history response analysis method of two kinds of calculation methods finally. Through comparison between the two selected larger values or their average value.

【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.23

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