【摘要】：人行天橋是城市交通工程的重要組成部分,是生命線工程的重要環(huán)節(jié)。近年來,為了緩解交通壓力,城市中建立了大量跨越交通主干道或快速路的人行天橋。由于構(gòu)造比較簡單,人行天橋的抗震問題沒有引起足夠重視,而且目前國內(nèi)外關(guān)于人行天橋的研究多集中于車橋和人橋引起的震動以及這種振動對人行天橋舒適性的影響;人行天橋的抗震研究尚屬空白,相關(guān)設(shè)計(jì)都是借鑒的常規(guī)橋梁的研究成果,忽略了人行天橋自身特性帶來的差異。為了探究人行天橋地震響應(yīng)特性,揭示其地震響應(yīng)機(jī)理,分析其結(jié)構(gòu)參數(shù)對其地震響應(yīng)的影響規(guī)律,本文以不同結(jié)構(gòu)形式的人行天橋?yàn)檠芯繉ο?通過非線性時(shí)程分析系統(tǒng)地研究了它們的地震響應(yīng)特性;針對人行天橋在地震中容易發(fā)生落梁這一問題,為不同結(jié)構(gòu)形式的人行橋設(shè)計(jì)了防落梁裝置,通過非線性時(shí)程分析詳細(xì)研究了防落裝置的防落效果和它們的影響因素。本文的主要工作如下:1.在查閱大量文獻(xiàn)的基礎(chǔ)上,回顧生命線工程和人行天橋工程的發(fā)展和研究現(xiàn)狀,分析人行天橋自身特點(diǎn)及其在地震中可能存在的問題,總結(jié)常規(guī)橋梁的地震響應(yīng)及防落梁措施研究進(jìn)展和現(xiàn)狀;2.對常規(guī)橋梁地震分析理論和方法進(jìn)行回顧和總結(jié),包括靜力分析法、反應(yīng)譜分析法和動力時(shí)程分析法;總結(jié)橋梁分析中存在的非線性問題,分析不同結(jié)構(gòu)形式人行天橋的地震分析要點(diǎn);詳細(xì)介紹人行天橋各單元在Sap2000中的模擬;3.以某簡支梁人行天橋工程為研究對象,運(yùn)用Sap2000建立該人行天橋的空間動力計(jì)算模型,通過非線性時(shí)程分析方法探究簡支梁人行天橋三維地震響應(yīng)特性及各影響因素的影響規(guī)律;4.以某梁拱組合人行天橋工程為研究對象,運(yùn)用Sap2000建立該人行天橋的空間動力計(jì)算模型,通過非線性時(shí)程分析方法探究梁拱組合人行天橋三維地震響應(yīng)特性及各影響因素的影響規(guī)律;5.針對選擇的典型簡支梁人行天橋和梁拱組合人行天橋的地震響應(yīng)特性設(shè)計(jì)防落梁措施;分別建立設(shè)置防落梁措施的人行天橋空間動力計(jì)算模型,詳細(xì)探究防落梁裝置的防落效果;以梁拱組合人行天橋?yàn)槔?通過建立不同參數(shù)的動力計(jì)算模型探討各參數(shù)對防落效果的影響規(guī)律。最后,對本文的研究內(nèi)容進(jìn)行總結(jié),對需要進(jìn)一步開展的工作進(jìn)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.
【學(xué)位授予單位】：北京工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U442.55;U448.11
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本文編號：2420796