特大跨度斜拉桥地震反应分析与振动控制
发布时间：2019-06-13 13:02
【摘要】：大跨度缆索体系桥梁以其强大的跨越能力而成为许多重要交通干线的枢纽,而这些重要的交通干线往往是关系国民经济的生命线工程。我国是一个地震频发的国家,保障大跨度桥梁在地震作用下的安全是非常重要的。截止目前,我国兴建了许多大跨度桥梁,结构越来越柔,周期越来越长,传统的抗震方法已经难以应付,如何能够既保证大跨度桥梁的结构安全,又能使设计不致于过分保守,成为目前大跨度桥梁领域的重要课题。本文以苏通大桥主桥——1088米跨度斜拉桥为研究对象,基于SAP2000有限元程序,对大跨度斜拉桥在地震作用下的地震反应、减隔震方法进行了研究。主要研究内容如下:1.大跨度斜拉桥动力特性研究。根据特征值理论,建立有限元模型,分析大跨度斜拉桥自由振动规律,根据模态分析结果预测地震反应。2.搜集桥址处地质资料,按规范确定加速度设计反应谱,根据人工合成地震波理论,以三角级数法编制相应程序合成人工地震波,并进行多维、多角度地震动输入下大跨度斜拉桥线性及非线性动力时程分析,总结此类桥梁的地震反应规律。3.考虑地震动空间差异的影响,对大跨度斜拉桥进行考虑行波效应的动力时程分析,并与一致激励情况对比,研究行波效应对此类桥梁地震反应的影响。4.分析并选择大跨度斜拉桥的合理抗震措施,分别进行纵向安装粘滞阻尼器,横向安装TMD减震控制系统的动力时程分析,研究其减震效果,并对大跨度斜拉桥的减震措施给出评价。
[Abstract]:Long-span cable system bridge has become the hub of many important traffic trunk lines because of its strong leapfrogging ability, and these important traffic trunk lines are often lifeline projects related to the national economy. China is a country with frequent earthquakes, so it is very important to ensure the safety of long-span bridges under earthquake action. Up to now, many long-span bridges have been built in our country, the structure is more and more flexible, the period is longer and longer, the traditional seismic method has been difficult to cope with. How to not only ensure the structural safety of long-span bridges, but also make the design not too conservative, has become an important topic in the field of long-span bridges. In this paper, the 1088 m span cable-stayed bridge, the main bridge of Sutong Bridge, is taken as the research object, and the seismic response and isolation method of long-span cable-stayed bridge under earthquake are studied based on SAP2000 finite element program. The main research contents are as follows: 1. Study on dynamic characteristics of long-span cable-stayed bridge. According to the eigenvalue theory, the finite element model is established to analyze the free vibration law of long-span cable-stayed bridge, and the seismic response is predicted according to the results of modal analysis. According to the theory of synthetic seismic wave, the corresponding program is compiled to synthesize artificial seismic wave, and the linear and nonlinear dynamic time history analysis of long-span cable-stayed bridge under multi-dimensional and multi-angle ground motion input is carried out, and the seismic response law of this kind of bridge is summarized. Considering the influence of spatial difference of ground motion, the dynamic time history analysis of long-span cable-stayed bridge considering traveling wave effect is carried out, and compared with the uniform excitation, the influence of traveling wave effect on seismic response of this kind of bridge is studied. 4. The reasonable seismic measures of long-span cable-stayed bridge are analyzed and selected, and the dynamic time history analysis of longitudinal installation of viscous dampers and transverse installation of TMD damping control system are carried out, the damping effect is studied, and the damping measures of long-span cable-stayed bridge are evaluated.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.27
本文编号：2498545
[Abstract]:Long-span cable system bridge has become the hub of many important traffic trunk lines because of its strong leapfrogging ability, and these important traffic trunk lines are often lifeline projects related to the national economy. China is a country with frequent earthquakes, so it is very important to ensure the safety of long-span bridges under earthquake action. Up to now, many long-span bridges have been built in our country, the structure is more and more flexible, the period is longer and longer, the traditional seismic method has been difficult to cope with. How to not only ensure the structural safety of long-span bridges, but also make the design not too conservative, has become an important topic in the field of long-span bridges. In this paper, the 1088 m span cable-stayed bridge, the main bridge of Sutong Bridge, is taken as the research object, and the seismic response and isolation method of long-span cable-stayed bridge under earthquake are studied based on SAP2000 finite element program. The main research contents are as follows: 1. Study on dynamic characteristics of long-span cable-stayed bridge. According to the eigenvalue theory, the finite element model is established to analyze the free vibration law of long-span cable-stayed bridge, and the seismic response is predicted according to the results of modal analysis. According to the theory of synthetic seismic wave, the corresponding program is compiled to synthesize artificial seismic wave, and the linear and nonlinear dynamic time history analysis of long-span cable-stayed bridge under multi-dimensional and multi-angle ground motion input is carried out, and the seismic response law of this kind of bridge is summarized. Considering the influence of spatial difference of ground motion, the dynamic time history analysis of long-span cable-stayed bridge considering traveling wave effect is carried out, and compared with the uniform excitation, the influence of traveling wave effect on seismic response of this kind of bridge is studied. 4. The reasonable seismic measures of long-span cable-stayed bridge are analyzed and selected, and the dynamic time history analysis of longitudinal installation of viscous dampers and transverse installation of TMD damping control system are carried out, the damping effect is studied, and the damping measures of long-span cable-stayed bridge are evaluated.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.27
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