空间扭转索面独塔斜拉桥的抗震研究
发布时间：2018-08-07 16:38
【摘要】：大跨度斜拉桥是交通工程的重要枢纽,也是生命线工程,一旦地震作用破坏了桥梁,抗震救灾工作将被严重的影响。而且我国又是地震多发国家,因此,全面、系统的研究斜拉桥的抗震性能是刻不容缓的。本文以主跨为钢箱梁的单塔斜拉桥为研究对象,对斜拉桥的自振特性进行了分析,对粘滞阻尼器的减震性能以及斜拉桥的主梁与桥台地震耦合关系进行了研究,主要工作包括以下几个方面:(1)总结国内外对结构振动控制的研究理论,介绍被动控制用的各种阻尼器及其耗能原理,其中重点介绍了阻尼器参数在实验室的调节方法。(2)运用有限元软件,对斜拉桥的各个组成部分(如斜拉索、桥塔、主梁桥墩、桩基础和支座等)采用合理的方式进行模拟,建立了有、无阻尼器的斜拉桥模型,对无阻尼器的斜拉桥的自振特性进行分析。(3)对有阻尼器和无阻尼器两个斜拉桥模型进行非线性时程分析,通过选取不同的粘滞阻尼器参数,分析比较斜拉桥在地震波三向输入下的桥塔和主梁位移、塔底弯矩和剪力,经过比选,得到一组最合理的阻尼参数,确定为阻尼器的设计参数。(4)在EI Centro Site地震波作用下,对斜拉桥的主梁与桥台进行碰撞分析。在设置具有最优阻尼参数的粘滞阻尼器作用下,分析主梁与桥台的碰撞耦合性,研究阻尼器对主梁与桥台之间碰撞的影响。
[Abstract]:Long-span cable-stayed bridge is an important hub of traffic engineering and also a lifeline project. Once the bridge is damaged by earthquake, the earthquake relief work will be seriously affected. Since China is an earthquake-prone country, it is urgent to study the seismic behavior of cable-stayed bridges in a comprehensive and systematic way. In this paper, the self-vibration characteristics of cable-stayed bridge with single tower cable-stayed bridge with main span as steel box girder are analyzed, and the damping performance of viscous damper and the seismic coupling relationship between main girder and abutment of cable-stayed bridge are studied. The main work includes the following aspects: (1) summing up the research theories of structural vibration control at home and abroad, introducing various dampers and their energy dissipation principles used in passive control. The adjustment method of damper parameters in laboratory is introduced emphatically. (2) various components of cable-stayed bridge (such as cable-stayed cable, bridge tower, pier of main beam, pile foundation and support etc.) are simulated by using finite element software. A cable-stayed bridge model with and without dampers is established, and the natural vibration characteristics of cable-stayed bridges without dampers are analyzed. (3) nonlinear time-history analysis of two cable-stayed bridge models with and without dampers is carried out, and different viscous damper parameters are selected. This paper analyzes and compares the displacement of tower and main beam, the bending moment and shear force of tower bottom of cable-stayed bridge under the three-direction input of seismic wave. Through comparison and selection, a group of most reasonable damping parameters are obtained, which are determined as the design parameters of damper. (4) under the action of EI Centro Site seismic wave, Collision analysis of main girder and abutment of cable-stayed bridge is carried out. Under the action of viscous dampers with optimal damping parameters, the collision coupling between girder and abutment is analyzed, and the effect of dampers on the collision between girder and abutment is studied.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.27
本文编号：2170675
[Abstract]:Long-span cable-stayed bridge is an important hub of traffic engineering and also a lifeline project. Once the bridge is damaged by earthquake, the earthquake relief work will be seriously affected. Since China is an earthquake-prone country, it is urgent to study the seismic behavior of cable-stayed bridges in a comprehensive and systematic way. In this paper, the self-vibration characteristics of cable-stayed bridge with single tower cable-stayed bridge with main span as steel box girder are analyzed, and the damping performance of viscous damper and the seismic coupling relationship between main girder and abutment of cable-stayed bridge are studied. The main work includes the following aspects: (1) summing up the research theories of structural vibration control at home and abroad, introducing various dampers and their energy dissipation principles used in passive control. The adjustment method of damper parameters in laboratory is introduced emphatically. (2) various components of cable-stayed bridge (such as cable-stayed cable, bridge tower, pier of main beam, pile foundation and support etc.) are simulated by using finite element software. A cable-stayed bridge model with and without dampers is established, and the natural vibration characteristics of cable-stayed bridges without dampers are analyzed. (3) nonlinear time-history analysis of two cable-stayed bridge models with and without dampers is carried out, and different viscous damper parameters are selected. This paper analyzes and compares the displacement of tower and main beam, the bending moment and shear force of tower bottom of cable-stayed bridge under the three-direction input of seismic wave. Through comparison and selection, a group of most reasonable damping parameters are obtained, which are determined as the design parameters of damper. (4) under the action of EI Centro Site seismic wave, Collision analysis of main girder and abutment of cable-stayed bridge is carried out. Under the action of viscous dampers with optimal damping parameters, the collision coupling between girder and abutment is analyzed, and the effect of dampers on the collision between girder and abutment is studied.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.27
【参考文献】
相关硕士学位论文 前1条
1 李波;大跨度斜拉桥抗震性能及两种减震措施的研究[D];湖南大学;2008年
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