非对称高墩连续刚构桥的地震反应分析与减震措施
发布时间：2018-09-09 08:42
【摘要】：本文利用大型结构分析软件Midas/Civil对非对称高墩大跨连续刚构桥建立有限元模型，并对结构的地震反应做了一些研究。本人主要研究内容如下： ①利用Midas/Civil对高墩大跨连续刚构桥梁建立有限元模型，进行特征值分析，得出它的自振频率与周期，以及振型，并分析其自振特点。 ②在不同地震荷载工况作用下，采用反应谱法和时程分析法对结构的地震反应进行分析；结构在相同荷载工况作用下，对桥梁关键截面反应谱法分析结果与时程分析法的结果进行了对比，，并得出结构在抗震设计时应如何有效的选取抗震计算方法。 ③建立四种不同桥墩高度的模型，采用反应谱法对结构在不同荷载工况的地震反应进行分析，通过关键截面的内力值，研究内力分布的规律。 ④在两端桥台上设置铅芯橡胶减震支座，运用非线性时程分析法，通过对结构减震前和减震后支座处截面内力对比，了解到通过安装减震支座，支座处截面在地震荷载作用时受力更合理。
[Abstract]:In this paper, the finite element model of continuous rigid frame bridge with asymmetric high pier and long span is established by using the large structure analysis software Midas/Civil, and the seismic response of the structure is studied. The main contents of my research are as follows: 1 the finite element model of long-span continuous rigid frame bridge with high piers and long span is established by Midas/Civil, and the eigenvalue analysis is carried out, and the natural frequency, period and mode shape of the bridge are obtained. And the characteristics of its natural vibration are analyzed. 2 the response spectrum method and time-history analysis method are used to analyze the seismic response of the structure under different seismic load conditions, and the structure is subjected to the same load condition. The analysis results of critical section response spectrum method and time history analysis method are compared, and how to select the seismic calculation method effectively in seismic design of the bridge is obtained. 3. Four models of different pier heights are established. The response spectrum method is used to analyze the seismic response of the structure under different load conditions. Through the internal force value of the key section, the law of internal force distribution is studied. By using nonlinear time history analysis method, by comparing the internal forces of the bearing sections before and after the shock absorption, it is found that the section of the bearing is more reasonable when the seismic load is applied through the installation of the shock absorber support.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.23;U442.55
本文编号：2231882
[Abstract]:In this paper, the finite element model of continuous rigid frame bridge with asymmetric high pier and long span is established by using the large structure analysis software Midas/Civil, and the seismic response of the structure is studied. The main contents of my research are as follows: 1 the finite element model of long-span continuous rigid frame bridge with high piers and long span is established by Midas/Civil, and the eigenvalue analysis is carried out, and the natural frequency, period and mode shape of the bridge are obtained. And the characteristics of its natural vibration are analyzed. 2 the response spectrum method and time-history analysis method are used to analyze the seismic response of the structure under different seismic load conditions, and the structure is subjected to the same load condition. The analysis results of critical section response spectrum method and time history analysis method are compared, and how to select the seismic calculation method effectively in seismic design of the bridge is obtained. 3. Four models of different pier heights are established. The response spectrum method is used to analyze the seismic response of the structure under different load conditions. Through the internal force value of the key section, the law of internal force distribution is studied. By using nonlinear time history analysis method, by comparing the internal forces of the bearing sections before and after the shock absorption, it is found that the section of the bearing is more reasonable when the seismic load is applied through the installation of the shock absorber support.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.23;U442.55
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本文编号：2231882
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