高墩大跨连续刚构桥地震响应研究

发布时间：2018-04-14 10:07

本文选题：高墩大跨连续刚构桥 + 自振特性　；参考：《天津城建大学》2014年硕士论文

【摘要】：近年来，随着我国高速公路建设向山区快速延伸，桥梁结构跨度越来越大，桥墩也变得越来越高，多座桥梁跨度和桥墩高度均超出了现行抗震设计规范所适用的限值。目前高墩大跨度连续刚构桥抗震设计主要还是参照规则桥梁进行，因此，有必要开展对高墩大跨度连续刚构桥地震响应研究，以此来指导该类非规则桥梁抗震设计。本文以城川河特大桥为研究对象，针对高墩大跨连续刚构桥进行地震响应分析，主要内容如下： (1)利用Midas/Civil分析了高墩大跨连续刚构桥自振特性，通过计算其自振频率与振型，总结了其自振规律，并利用正交试验设计思想，，建立16个试验模型，通过改变桥梁结构设计参数（上部结构边中跨比、上部结构梁底幂次、桥墩壁厚、桥墩间距）研究其对结构自振特性影响。 (2)采用反应谱分析法，对采用正交试验设计的16个桥梁模型进行地震响应分析，通过对结果的极差和方差分析，确定结构设计参数对高墩大跨连续刚构桥的敏感程度。 (3)采用线性时程分析法，对高墩大跨连续刚构桥在不同地震波下各控制截面的位移和内力进行比较分析，选取各地震波作用下地震响应结果中最大值，并将其结果与相应的反应谱分析结果比较，验证选取地震波是否满足规范要求。 (4)考虑了行波效应对城川河大桥的影响，并与一致激励下结果进行对比，总结了行波效应下高墩大跨连续刚构桥地震响应的特点，并研究了行波效应下桥墩壁厚变化时对该连续刚构桥的影响程度。 (5)采用非线性时程分析法，考虑材料非线性，研究墩高对高墩大跨连续刚构桥非线性地震响应影响。
[Abstract]:In recent years, with the rapid extension of highway construction to mountainous areas in China, the span of bridge structure becomes larger and larger, and the pier becomes higher and higher. Many bridges span and pier height exceed the limits applicable to the current seismic design code.At present, the seismic design of long-span continuous rigid frame bridges with high piers is mainly carried out with reference to regular bridges. Therefore, it is necessary to study the seismic response of long-span continuous rigid frame bridges with high piers so as to guide the seismic design of this kind of irregular bridges.This paper takes Chengchuan River Bridge as the research object, carries on the seismic response analysis for the high-pier long-span continuous rigid frame bridge, the main content is as follows:1) the natural vibration characteristics of long-span continuous rigid frame bridges with high piers and long spans are analyzed by using Midas/Civil. By calculating their natural frequencies and modes, the natural vibration laws are summarized, and 16 test models are established by using the idea of orthogonal test design.By changing the design parameters of bridge (middle span ratio of superstructure, power of bottom of superstructure, thickness of pier wall and distance between piers), the influence of the parameters on the natural vibration characteristics of the structure is studied.The seismic response of 16 bridge models designed by orthogonal test is analyzed by using response spectrum analysis. The sensitivity of structural design parameters to continuous rigid frame bridges with high piers and long spans is determined by the analysis of the range and variance of the results.In this paper, the displacement and internal force of the control section of the continuous rigid frame bridge with high piers and long span under different seismic waves are compared and analyzed by linear time-history analysis, and the maximum value of the seismic response results under the action of each seismic wave is selected.The results are compared with the corresponding response spectrum analysis results to verify whether the selected seismic waves meet the requirements of the code.(4) considering the effect of traveling wave effect on Chengchuan River Bridge, and comparing with the results under uniform excitation, the characteristics of seismic response of long-span continuous rigid frame bridge with high piers under traveling wave effect are summarized.The influence of pier wall thickness on the continuous rigid frame bridge is also studied.The influence of pier height on nonlinear seismic response of long-span continuous rigid frame bridge with high piers is studied by using nonlinear time-history analysis method and considering material nonlinearity.
【学位授予单位】：天津城建大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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