多跨连续刚架拱桥地震反应及加固技术研究

发布时间：2018-02-14 05:31

本文关键词： 多跨连续刚架拱桥地震响应反应谱分析动力时程分析　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：我国地处欧亚地震带和环太平洋地震带之间,破坏性地震频繁,地震损失较为严重。桥梁结构作为生命线工程的重要组成部分,在地震发生后的救援、救灾,和灾后重建中起到了极为重要的作用。近年来,从震害的调查结果来看出,桥梁结构在地震中的毁坏是十分严重的,且由此产生的次生灾害带来了巨大的损失。刚架拱桥由于结构简洁、造型优美等优点,被大量采用。但是对于多跨连续刚架拱桥的动力特性,尤其是其地震反应特点,目前研究的较少。在历次的地震中,都有刚架拱桥破坏的案例。其中在对汶川地震中的震害调查和统计也发现,多跨连续刚架拱桥也是桥梁主要震害之一,很具有代表性。本文在总结桥梁震害多跨连续刚架拱桥抗震研究的基础上,以彭州川西大桥为工程背景,应用大型通用软件ANSYS,建立川西大桥的空间杆系模型,对该桥梁进行了反应谱和动力时程分析,主要研究内容： ①建立空间模型计算了桥梁动力特性,分别进行了反应谱分析和动力时程分析,分别对桥梁进行横桥、顺桥和竖向三向输入方式进行地震分析,比较了反应谱分析和动力时程分析的差异,并讨论多跨连续刚架拱桥地震反应的特点； ②采用汶川地震波针对川西大桥进行了动力时程分析,讨论了在汶川地震作用下多跨连续刚架桥梁的可能破坏位置； ③针对加固后的桥梁建立模型,计算了加固后的桥梁动力特性,并对桥梁进行了反应谱分析；对比了加固前后的川西大桥的动力反应和反应谱分析结果。最后对桥梁的薄弱位置—拱腿、斜撑进行抗弯强度验算,并对多跨连续刚架桥梁加固后的性能进行评价。通过对川西大桥进行地震反应分析,总结了该类桥梁的地震响应特点,为以后该类桥梁的抗震设计提供参考。
[Abstract]:China is located between the Eurasian seismic belt and the Pacific Rim seismic belt, with frequent destructive earthquakes and serious earthquake losses. As an important part of lifeline engineering, bridge structure is an important part of rescue and disaster relief after the earthquake. In recent years, from the survey results of earthquake damage, the damage of bridge structure in the earthquake is very serious, and the resulting secondary disasters have brought huge losses. Rigid arch bridges are widely used because of their simple structure and beautiful shape. However, the dynamic characteristics of multi-span continuous rigid arch bridges, especially their seismic response characteristics, are seldom studied at present. Among them, the investigation and statistics of earthquake damage in Wenchuan earthquake also found that multi-span continuous rigid arch bridge is also one of the main damage of bridge, which is very representative. On the basis of summarizing the seismic research of multi-span continuous rigid frame arch bridge caused by earthquake damage, taking the Pengzhou Western Sichuan Bridge as the engineering background, the spatial bar model of the bridge is established by using the large-scale universal software ANSYS. The response spectrum and dynamic time history of the bridge are analyzed. 1. The dynamic characteristics of the bridge are calculated by establishing the spatial model, and the response spectrum analysis and dynamic time history analysis are carried out respectively, and the seismic analysis of the bridge is carried out in the transverse bridge, the forward bridge and the vertical three direction input mode, respectively. The difference between response spectrum analysis and dynamic time history analysis is compared, and the characteristics of seismic response of multi-span continuous rigid arch bridge are discussed. Using Wenchuan seismic wave to analyze the dynamic time history of the bridge in west Sichuan, the possible damage position of the multi-span continuous rigid frame bridge under the Wenchuan earthquake is discussed. (3) for the strengthened bridge, the dynamic characteristics of the strengthened bridge are calculated, and the response spectrum of the bridge is analyzed. The results of dynamic response and response spectrum analysis of the bridge before and after reinforcement are compared. Finally, the flexural strength of the weak position of the bridge-arch leg and inclined brace is checked, and the performance of the multi-span continuous rigid frame bridge after reinforcement is evaluated. Based on the seismic response analysis of the western Sichuan Bridge, the characteristics of the seismic response of this kind of bridge are summarized, which provides a reference for the seismic design of this kind of bridge in the future.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.72

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