基于ABAQUS的上承式钢桁架拱桥地震响应分析
发布时间：2019-04-07 16:18
【摘要】：随着国家的改革建设,道路建设的总长度越来越大,桥梁的建设也愈发重要,各种结构类型的桥梁应用而生。钢桁架结构拱桥以其材料用量少、结构自重轻、受力鲜明以及美观大方等特点广受工程师采纳。地震的强大破坏力不仅给国民经济造成巨大损失,对人类生命安全也造成伤害。当前的桥梁工程研究学者们的主要课题目标是探究如何提高桥梁的抗震能力。因此,钢桁架对于上承式钢拱桥的地震反应分析具有明显的工程实用价值和意义。本论文研究的工程案例是一座上承式钢桁架拱桥,基于ABAQUS有限元软件对其建立空间模型,研究在强震下的反应。文中的主要研究内容概述如下:(1)利用有限元软件建立模型,得出钢桁架拱桥在十二阶振动模态中的振型,研究分析得出该拱桥的第一阶振型均为全桥的竖向反对称挠曲振动,高阶振型对该类桥梁的影响不可忽略,尤其在对这一类型桥梁进行反应谱抗震设计时需要谨慎注意;(2)对拱桥进行地震波反应谱分析以及罕遇地震动作用下的纵桥向和横桥向的弹塑性时程分析,从研究中得知,纵向地震作用下的拱桥整体结构基本属于弹性阶段,横桥向地震作用下,拱桥的地震响应比纵桥向大很多,且桥边墩间的支撑处于弹性阶段或出现屈曲现象,滞回性能较差;(3)以JRT-NS波为例,对文中案例拱桥进行纵桥向+2/3竖向和横桥向+2/3竖向地震动输入,研究探讨了案例钢拱桥在竖向地震输入时的抗震性能影响;再进行纵桥向+竖向地震激励作用下和纵桥向地震激励下的关于拱脚轴力、拱肋截面、拱顶以及梁跨中截面处的增加幅度比较;行波效应下分析得知增加幅度较大处是拱肋轴力。以上问题的分析研究,清楚认识到上承式钢桁架拱桥的振动模态中的振型、地震波下时程分析反应以及最不利地震波的输入,得出结论并对类似的桥梁结构的抗震设计给予合理的设计建议。
[Abstract]:With the reform and construction of our country, the total length of road construction becomes larger and larger, and the construction of bridges becomes more and more important. Steel truss arch bridge is widely accepted by engineers because of its few materials, light weight, bright force and beautiful appearance and so on. The strong destructive power of the earthquake not only causes huge losses to the national economy, but also damages the safety of human life. At present, the main task of bridge engineering researchers is to explore how to improve the anti-seismic ability of bridges. Therefore, steel trusses have obvious practical value and significance for seismic response analysis of steel arch bridges. The project case studied in this paper is a steel truss arch bridge. Based on the finite element software ABAQUS, the spatial model of the arch bridge is established and the response to strong earthquakes is studied. The main research contents in this paper are summarized as follows: (1) the model of steel truss arch bridge is established by finite element software, and the vibration modes of steel truss arch bridge in twelve-order vibration modes are obtained. The results show that the first vibration mode of the arch bridge is vertical anti-symmetric flexure vibration of the whole bridge, and the influence of higher-order vibration mode on this kind of bridge can not be ignored, especially in the seismic design of this type of bridge with response spectrum. (2) the seismic wave response spectrum analysis of arch bridge and elastic-plastic time history analysis of longitudinal bridge direction and transverse bridge direction under rare ground motion show that the whole structure of arch bridge under longitudinal earthquake basically belongs to elastic stage. Under transverse earthquake, the seismic response of arch bridge is much larger than that of longitudinal bridge, and the bracing between piers on the side of bridge is in elastic stage or buckling phenomenon, so the hysteretic performance of arch bridge is poor. (3) taking the JRT-NS wave as an example, the seismic performance of the steel arch bridge in the case is studied by the vertical and transverse seismic input of the case arch bridge in the vertical and transverse direction, and the influence of the steel arch bridge on the seismic performance of the arch bridge under the vertical seismic input is studied. Then, the increases of axial force of arch foot, arch rib section, arch roof and middle section of beam span under longitudinal and longitudinal seismic excitation are compared. According to the analysis of traveling wave effect, the axial force of arch rib is the main part of the increase. The analysis and research of the above problems have clearly recognized the vibration modes in the vibration mode of the steel truss arch bridge, the response of the time history analysis under the seismic wave and the input of the most unfavorable seismic wave. The conclusion is drawn and reasonable design suggestions for similar bridge structures are given.
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55;U448.22
[Abstract]:With the reform and construction of our country, the total length of road construction becomes larger and larger, and the construction of bridges becomes more and more important. Steel truss arch bridge is widely accepted by engineers because of its few materials, light weight, bright force and beautiful appearance and so on. The strong destructive power of the earthquake not only causes huge losses to the national economy, but also damages the safety of human life. At present, the main task of bridge engineering researchers is to explore how to improve the anti-seismic ability of bridges. Therefore, steel trusses have obvious practical value and significance for seismic response analysis of steel arch bridges. The project case studied in this paper is a steel truss arch bridge. Based on the finite element software ABAQUS, the spatial model of the arch bridge is established and the response to strong earthquakes is studied. The main research contents in this paper are summarized as follows: (1) the model of steel truss arch bridge is established by finite element software, and the vibration modes of steel truss arch bridge in twelve-order vibration modes are obtained. The results show that the first vibration mode of the arch bridge is vertical anti-symmetric flexure vibration of the whole bridge, and the influence of higher-order vibration mode on this kind of bridge can not be ignored, especially in the seismic design of this type of bridge with response spectrum. (2) the seismic wave response spectrum analysis of arch bridge and elastic-plastic time history analysis of longitudinal bridge direction and transverse bridge direction under rare ground motion show that the whole structure of arch bridge under longitudinal earthquake basically belongs to elastic stage. Under transverse earthquake, the seismic response of arch bridge is much larger than that of longitudinal bridge, and the bracing between piers on the side of bridge is in elastic stage or buckling phenomenon, so the hysteretic performance of arch bridge is poor. (3) taking the JRT-NS wave as an example, the seismic performance of the steel arch bridge in the case is studied by the vertical and transverse seismic input of the case arch bridge in the vertical and transverse direction, and the influence of the steel arch bridge on the seismic performance of the arch bridge under the vertical seismic input is studied. Then, the increases of axial force of arch foot, arch rib section, arch roof and middle section of beam span under longitudinal and longitudinal seismic excitation are compared. According to the analysis of traveling wave effect, the axial force of arch rib is the main part of the increase. The analysis and research of the above problems have clearly recognized the vibration modes in the vibration mode of the steel truss arch bridge, the response of the time history analysis under the seismic wave and the input of the most unfavorable seismic wave. The conclusion is drawn and reasonable design suggestions for similar bridge structures are given.
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55;U448.22
【参考文献】
相关期刊论文 前10条
1 王占飞;邢宇s，
本文编号：2454221
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