人行天桥三维地震响应特性及防落梁措施研究

发布时间：2019-02-12 21:16

【摘要】：人行天桥是城市交通工程的重要组成部分,是生命线工程的重要环节。近年来,为了缓解交通压力,城市中建立了大量跨越交通主干道或快速路的人行天桥。由于构造比较简单,人行天桥的抗震问题没有引起足够重视,而且目前国内外关于人行天桥的研究多集中于车桥和人桥引起的震动以及这种振动对人行天桥舒适性的影响;人行天桥的抗震研究尚属空白,相关设计都是借鉴的常规桥梁的研究成果,忽略了人行天桥自身特性带来的差异。为了探究人行天桥地震响应特性,揭示其地震响应机理,分析其结构参数对其地震响应的影响规律,本文以不同结构形式的人行天桥为研究对象,通过非线性时程分析系统地研究了它们的地震响应特性;针对人行天桥在地震中容易发生落梁这一问题,为不同结构形式的人行桥设计了防落梁装置,通过非线性时程分析详细研究了防落装置的防落效果和它们的影响因素。本文的主要工作如下:1.在查阅大量文献的基础上,回顾生命线工程和人行天桥工程的发展和研究现状,分析人行天桥自身特点及其在地震中可能存在的问题,总结常规桥梁的地震响应及防落梁措施研究进展和现状;2.对常规桥梁地震分析理论和方法进行回顾和总结,包括静力分析法、反应谱分析法和动力时程分析法;总结桥梁分析中存在的非线性问题,分析不同结构形式人行天桥的地震分析要点;详细介绍人行天桥各单元在Sap2000中的模拟;3.以某简支梁人行天桥工程为研究对象,运用Sap2000建立该人行天桥的空间动力计算模型,通过非线性时程分析方法探究简支梁人行天桥三维地震响应特性及各影响因素的影响规律;4.以某梁拱组合人行天桥工程为研究对象,运用Sap2000建立该人行天桥的空间动力计算模型,通过非线性时程分析方法探究梁拱组合人行天桥三维地震响应特性及各影响因素的影响规律;5.针对选择的典型简支梁人行天桥和梁拱组合人行天桥的地震响应特性设计防落梁措施;分别建立设置防落梁措施的人行天桥空间动力计算模型,详细探究防落梁装置的防落效果;以梁拱组合人行天桥为例,通过建立不同参数的动力计算模型探讨各参数对防落效果的影响规律。最后,对本文的研究内容进行总结,对需要进一步开展的工作进行展望。
[Abstract]:Pedestrian overpass is an important part of urban traffic engineering and an important link of lifeline engineering. In recent years, in order to relieve traffic pressure, a large number of pedestrian overpasses have been built across main roads or expressways in cities. Because of the simple structure, the aseismic problem of footbridge is not paid enough attention to, and the research on pedestrian overpass at home and abroad focuses on the vibration caused by vehicle-bridge and man-bridge and the influence of this vibration on the comfort of footbridge. The seismic research of footbridge is still blank, and the related design is the research result of conventional bridge, ignoring the difference caused by the characteristics of footbridge itself. In order to explore the seismic response characteristics of footbridge, reveal its seismic response mechanism and analyze the influence of its structural parameters on its seismic response, this paper takes the pedestrian flyover with different structural forms as the research object. Their seismic response characteristics are systematically studied by nonlinear time-history analysis. Aiming at the problem that beam fall is easy to occur in earthquake of pedestrian overpass, the anti-falling beam device is designed for the footbridge with different structure, and the anti-drop effect and its influencing factors are studied in detail through nonlinear time-history analysis. The main work of this paper is as follows: 1. On the basis of consulting a large number of documents, the development and research status of lifeline engineering and footbridge engineering are reviewed, and the characteristics of pedestrian overpass and its possible problems in earthquake are analyzed. The research progress and present situation of seismic response and anti-falling beam measures of conventional bridges are summarized. 2. The theories and methods of conventional bridge seismic analysis are reviewed and summarized, including static analysis, response spectrum analysis and dynamic time-history analysis. This paper summarizes the nonlinear problems existing in bridge analysis, analyzes the main points of seismic analysis for different structural types of footbridge, introduces in detail the simulation of each element of pedestrian bridge in Sap2000, and 3. Taking a simple beam footbridge project as the research object, the spatial dynamic calculation model of the footbridge is established by using Sap2000, and the three-dimensional seismic response characteristics of the footbridge with simply supported beam and the influence law of the influencing factors are studied by nonlinear time-history analysis method. 4. The spatial dynamic calculation model of a beam-arch composite footbridge is established by using Sap2000. Through nonlinear time-history analysis method, the three-dimensional seismic response characteristics of beam-arch composite footbridge and the influence law of various influencing factors are studied. 5. Aiming at the seismic response characteristics of the typical simple supported beam pedestrian overpass and the combined beam and arch footbridge, the anti-falling beam measures are designed. The spatial dynamic calculation model of pedestrian overpass with anti-drop measures was established, and the anti-drop effect of anti-falling beam device was discussed in detail. Taking the beam-arch composite footbridge as an example, the influence of each parameter on the anti-drop effect is discussed by establishing the dynamic calculation model with different parameters. Finally, the research content of this paper is summarized, and the work that needs to be further developed is prospected.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.11
，

本文编号：2420796