大跨曲线连续梁桥地震响应及参数分析
发布时间：2018-08-12 11:53
【摘要】：曲线梁桥不仅满足道路整体线形的平顺和连续性,而且能很好的克服地形和地物的制约,因此该种桥型在国内外得到了广泛的应用。但在近些年来多次大地震中,曲线梁桥依然有着较为严重的破坏,所以,研究不同参数下的大跨曲线梁桥在地震作用下的响应规律意义重大。本文以大跨径曲线连续梁桥为研究对象,对其在不同参数下的地震响应规律进行研究,其内容如下:(1)运用有限元分析软件建立不同参数下大跨曲线连续梁桥的有限元分析模型,研究曲率半径与桩土相互作用对桥梁结构自振特性的影响以得到相应变化规律。(2)基于反应谱分析方法,分别从顺桥向激励和横桥向激励两个方面考虑地震作用下桥梁位移、主梁内力和桥墩内力,以研究曲率半径对大跨曲线连续梁桥地震响应的影响,得到不同曲率半径下地震反应的变化规律。(3)选取曲率半径为300m的大跨曲线连续梁桥,通过变化激励的角度以研究激励方向对其地震响应的影响,得出不同激励方向下地震响应的变化规律。(4)基于动态时程分析方法,选择曲率半径为300m的桥梁,通过变化墩高和相对墩高差,以研究墩高和墩高差对大跨曲线连续梁桥地震反应的影响,得出不同等墩高和不同相对墩高差下的地震响应规律。根据数值分析得到的规律,针对于大跨曲线连续梁桥抗震设计时选定合理设计参数提出一些有益的建议。
[Abstract]:Curved girder bridge can not only satisfy the smooth and continuity of the whole road, but also overcome the constraints of terrain and features, so the bridge is widely used at home and abroad. However, in recent years, the curved girder bridges still have serious damage, so it is of great significance to study the response law of the long-span curved bridges under the earthquake action with different parameters. In this paper, the seismic response of long-span curved continuous beam bridge under different parameters is studied. The main contents are as follows: (1) the finite element analysis model of long-span curved continuous beam bridge with different parameters is established by using finite element analysis software. The influence of radius of curvature and pile-soil interaction on the natural vibration characteristics of bridge structure is studied in order to obtain the corresponding variation law. (2) based on the response spectrum analysis method, the bridge displacement under seismic action is considered from the two aspects of forward bridge excitation and transverse bridge excitation, respectively. In order to study the influence of curvature radius on seismic response of long-span curved continuous beam bridge, the variation law of seismic response under different curvature radii is obtained. (3) large span curved continuous beam bridge with curvature radius of 300 m is selected. By studying the influence of the direction of excitation on the seismic response, the variation law of seismic response under different excitation directions is obtained. (4) based on the dynamic time-history analysis method, a bridge with a curvature radius of 300 m is selected. By changing the pier height and the relative pier height difference, the influence of pier height and pier height difference on the seismic response of long-span curved continuous beam bridge is studied, and the seismic response law under different pier height and different relative pier height difference is obtained. According to the law obtained by numerical analysis, some useful suggestions are put forward for selecting reasonable design parameters in seismic design of long-span curved continuous beam bridges.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55
本文编号：2178979
[Abstract]:Curved girder bridge can not only satisfy the smooth and continuity of the whole road, but also overcome the constraints of terrain and features, so the bridge is widely used at home and abroad. However, in recent years, the curved girder bridges still have serious damage, so it is of great significance to study the response law of the long-span curved bridges under the earthquake action with different parameters. In this paper, the seismic response of long-span curved continuous beam bridge under different parameters is studied. The main contents are as follows: (1) the finite element analysis model of long-span curved continuous beam bridge with different parameters is established by using finite element analysis software. The influence of radius of curvature and pile-soil interaction on the natural vibration characteristics of bridge structure is studied in order to obtain the corresponding variation law. (2) based on the response spectrum analysis method, the bridge displacement under seismic action is considered from the two aspects of forward bridge excitation and transverse bridge excitation, respectively. In order to study the influence of curvature radius on seismic response of long-span curved continuous beam bridge, the variation law of seismic response under different curvature radii is obtained. (3) large span curved continuous beam bridge with curvature radius of 300 m is selected. By studying the influence of the direction of excitation on the seismic response, the variation law of seismic response under different excitation directions is obtained. (4) based on the dynamic time-history analysis method, a bridge with a curvature radius of 300 m is selected. By changing the pier height and the relative pier height difference, the influence of pier height and pier height difference on the seismic response of long-span curved continuous beam bridge is studied, and the seismic response law under different pier height and different relative pier height difference is obtained. According to the law obtained by numerical analysis, some useful suggestions are put forward for selecting reasonable design parameters in seismic design of long-span curved continuous beam bridges.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55
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1 杨风利;铁路桥梁减隔震设计方法及设计参数研究[D];北京交通大学;2007年
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