地震荷载作用下粘弹性地基上桥梁结构特性分析
发布时间：2018-10-16 10:13
【摘要】：高速铁路作为一种高标准的铁路客运专线,线路保持平顺性是基本要求,因而大量使用连续梁桥。桥梁作为陆路交通的纽带,使交通路网成为整体,方便出行,地震发生时,桥梁作为生命线,保障了受灾区与外界的联系。因此桥梁的抗震就显得十分重要。本文运用时程分析法,采用有限元单元法进行数值计算,对桥梁结构进行地震载荷作用下时程反应分析。主要研究内容如下:1.本文介绍了结构在地震荷载作用下的几种分析方法以及时程分析法的原理、优点和具体内容。描述了粘弹性地基的麦克斯韦模型和开尔文模型两种模型,并给出桥梁结构在地震荷载作用下的运动方程。2.建立了三跨连续箱式梁桥的有限元模型,并对结构进行动力特性分析,得出结构的自振频率和振型。3.在桥梁顺桥方向和横桥方向分别施加地震荷载,进行地震时程反应分析,给出结构在地震荷载作用下的位移、弯矩、剪力响应及桥墩墩底截面的应力,对比数值模拟结果与铁路抗震规范的简化方法所得结果,表明数值模拟结果更加合理,简化方法所得结果更偏于安全。4.分析地震荷载作用下结构的位移、弯矩、剪力时程响应曲线,对比同一地震波作用下桥墩不同高度、不同方向的位移、弯矩、剪力响应的最大值,不同地震波同一方向作用下位移、弯矩、剪力的响应的最大值。
[Abstract]:As a high standard passenger dedicated railway line, it is a basic requirement for high-speed railway to maintain smooth running, so continuous beam bridges are widely used. Bridge is the link of land transportation, which makes the transportation network become a whole and convenient to travel. When the earthquake occurs, the bridge is the lifeline, which ensures the connection between the disaster area and the outside world. So the earthquake resistance of the bridge is very important. In this paper, time-history analysis method and finite element method are used to calculate the time-history response of bridge structure under seismic load. The main contents are as follows: 1. In this paper, the principle, advantages and concrete contents of the method of time-history analysis for structures under earthquake load are introduced. The Maxwell model and Kelvin model of viscoelastic foundation are described, and the equations of motion of bridge structure under earthquake load are given. The finite element model of the three-span continuous box girder bridge is established, and the dynamic characteristics of the structure are analyzed, and the natural vibration frequency and vibration mode of the structure are obtained. The seismic time response analysis is carried out on the direction of the bridge along the bridge and the direction of the transverse bridge, and the displacement, bending moment, shear response and the stress at the bottom section of the pier are given. The comparison between the numerical simulation results and the simplified method of railway seismic code shows that the numerical simulation results are more reasonable and the simplified method results are more safety. 4. The displacement, bending moment and shear response curve of the structure under seismic load are analyzed, and the maximum values of displacement, bending moment and shear response of pier under the same seismic wave are compared. The maximum response of displacement, bending moment and shear force under the same direction of different seismic waves.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441
本文编号：2274032
[Abstract]:As a high standard passenger dedicated railway line, it is a basic requirement for high-speed railway to maintain smooth running, so continuous beam bridges are widely used. Bridge is the link of land transportation, which makes the transportation network become a whole and convenient to travel. When the earthquake occurs, the bridge is the lifeline, which ensures the connection between the disaster area and the outside world. So the earthquake resistance of the bridge is very important. In this paper, time-history analysis method and finite element method are used to calculate the time-history response of bridge structure under seismic load. The main contents are as follows: 1. In this paper, the principle, advantages and concrete contents of the method of time-history analysis for structures under earthquake load are introduced. The Maxwell model and Kelvin model of viscoelastic foundation are described, and the equations of motion of bridge structure under earthquake load are given. The finite element model of the three-span continuous box girder bridge is established, and the dynamic characteristics of the structure are analyzed, and the natural vibration frequency and vibration mode of the structure are obtained. The seismic time response analysis is carried out on the direction of the bridge along the bridge and the direction of the transverse bridge, and the displacement, bending moment, shear response and the stress at the bottom section of the pier are given. The comparison between the numerical simulation results and the simplified method of railway seismic code shows that the numerical simulation results are more reasonable and the simplified method results are more safety. 4. The displacement, bending moment and shear response curve of the structure under seismic load are analyzed, and the maximum values of displacement, bending moment and shear response of pier under the same seismic wave are compared. The maximum response of displacement, bending moment and shear force under the same direction of different seismic waves.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441
【参考文献】
相关期刊论文 前10条
1 王天利;李青宁;王敏利;闫雯;;复杂立交时程分析地震输入的选择和人工合成[J];广西大学学报(自然科学版);2014年04期
2 潘旦光;;直接确定Rayleigh阻尼系数的一种优化方法[J];工程力学;2013年09期
3 李青宁;朱坤;高依强;;多点激励下不同墩高对曲线桥地震响应分析[J];交通科技与经济;2013年05期
4 王东升;岳茂光;李晓莉;孙治国;屈浩;;高墩桥梁抗震时程分析输入地震波选择[J];土木工程学报;2013年S1期
5 李建亮;赵晶;李福海;何玉林;亢川川;;结构抗震设计时程分析法的分析研究[J];四川地震;2011年04期
6 王家全;张信贵;易念平;方崇;;场地土卓越周期变化的试验分析[J];广西大学学报(自然科学版);2010年04期
7 易伦雄;;南京大胜关长江大桥大跨度钢桁拱桥设计研究[J];桥梁建设;2009年05期
8 杨志勇;黄吉锋;邵弘;;弹性与弹塑性动力时程分析方法中若干问题探讨[J];建筑结构学报;2009年S1期
9 赵稳;;客运专线大跨度连续梁桥桥墩时程反应分析与研究[J];铁道建筑;2008年09期
10 高宗余;;武汉天兴洲公铁两用长江大桥总体设计[J];桥梁建设;2007年01期
相关硕士学位论文 前2条
1 左振锋;连续梁桥桩柱地震响应分析与抗震设计研究[D];长安大学;2013年
2 王伟;反应谱法和时程分析法在高层抗震计算中的对比分析[D];华南理工大学;2012年
，本文编号：2274032
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2274032.html
