本文選題：鋼拱橋　切入點：抗震分析　出處：《蘭州交通大學》2015年碩士論文　論文類型：學位論文

【摘要】：進入二十一世紀以來,隨著我國拱橋施工技術的日益成熟及鋼鐵冶煉技術的迅猛發(fā)展,我國修建的鋼拱橋在數(shù)量和跨徑兩方面都出現(xiàn)了飛躍式的發(fā)展。鋼拱橋不僅具有很高的承載力,同時由于具有較高的強度比,因此能夠設計成大跨度橋梁。鋼拱橋還有結(jié)構(gòu)形式優(yōu)美的特點,因此在橋梁建設中備受青睞,目前在鐵路、公路和市政橋梁中都得到廣泛的應用。本論文依托蘭州市一座下承式鋼拱橋為工程背景,懫用MIDAS/CIVIL有限元軟件建立全橋空間模型,研究其地震反應。主要研究內(nèi)容有以下幾個方面:(1)首先介紹了國內(nèi)外鋼拱橋的發(fā)展現(xiàn)狀、抗震研究現(xiàn)狀及震害特點。其次根據(jù)目前橋梁抗震設計的發(fā)展概況,介紹了橋梁抗震分析的基本方法,為城市大跨度鋼拱橋的地震反應分析提供了一定的理論基礎。(2)根據(jù)結(jié)構(gòu)動力學理論,利用空間有限元分析軟件MIDAS/CIVIL建立鋼拱橋的全橋空間有限元計算模型,對該橋自振特性進行研究。分析過程中考慮了樁土相互作用以及主拱外傾角度的變化,研究了拱肋傾角對該橋動力特性的影響。(3)在動力特性分析的基礎上,依據(jù)該橋安評報告確定反應譜曲線,并采用反應譜分析方法進行抗震計算。在E1地震動作用下,考慮主拱傾斜角度變化及大橋在縱向、橫向、縱+豎、橫+豎四種不同輸入方式下的地震反應分析對比,探討不同地震動輸入方式及拱肋傾角對大跨度鋼拱橋反應譜分析結(jié)果的影響。(4)在罕遇地震下,采用非線性動力時程分析法,對該橋在一致激勵下分別按縱向和橫向兩種輸入方式輸入三條強震記錄地震波,進行不同輸入方式下的地震反應分析對比。結(jié)合摩擦擺支座(FPB)的相關力學模型及計算參數(shù),對使用了摩擦擺支座的模型進行時程分析,探討了FPB支座的減隔震效果。通過對以上問題的分析研究,對該鋼拱橋的動力特性、該橋的抗震最不利地震波輸入組合以及摩擦擺支座的隔震性能有了更為深刻的認識,并對類似橋型的抗震薄弱環(huán)節(jié)提出合理化的設計建議。
[Abstract]:Since 21th century, with the maturation of arch bridge construction technology and the rapid development of iron and steel smelting technology in China, The steel arch bridges built in China have developed rapidly in both quantity and span. The steel arch bridges not only have high bearing capacity, but also have high strength ratio. So it can be designed to be a long span bridge. Steel arch bridge also has the characteristics of beautiful structure, so it is very popular in bridge construction. At present, it is on the railway. Both highway and municipal bridges are widely used. Based on the engineering background of a through steel arch bridge in Lanzhou City, this paper uses MIDAS/CIVIL finite element software to establish the spatial model of the whole bridge. The main research contents are as follows: firstly, the development status, seismic research status and earthquake damage characteristics of steel arch bridges at home and abroad are introduced. Secondly, according to the development situation of aseismic design of bridges at present, This paper introduces the basic method of seismic analysis of bridges, which provides a theoretical basis for seismic response analysis of large span steel arch bridges in cities. The spatial finite element model of the steel arch bridge is established by using the spatial finite element analysis software MIDAS/CIVIL, and the natural vibration characteristics of the bridge are studied. The pile-soil interaction and the variation of the angle of inclination outside the main arch are taken into account in the analysis. The influence of arch rib inclination angle on the dynamic characteristics of the bridge is studied. Based on the analysis of the dynamic characteristics, the response spectrum curve is determined according to the bridge safety evaluation report, and the seismic calculation is carried out by using the response spectrum analysis method. Considering the variation of the inclination angle of the main arch and the analysis and comparison of the seismic response of the bridge under four different input modes: longitudinal, transverse, vertical and vertical, The influence of different input modes of ground motion and the inclination of arch rib on the results of response spectrum analysis of long-span steel arch bridges is discussed. The nonlinear dynamic time-history analysis method is used in rare earthquakes. Under uniform excitation, three strong earthquake recorded seismic waves were inputted into the bridge under the same excitation, and the seismic response of the bridge was analyzed and compared under different input modes. In combination with the relevant mechanical model and calculation parameters of the friction pendulum bearing FPBs, the seismic response of the bridge was analyzed and compared. In this paper, the time history analysis of the model of friction pendulum bearing is carried out, and the seismic isolation effect of FPB bearing is discussed. The dynamic characteristics of the steel arch bridge are studied through the analysis of the above problems. The most unfavorable seismic wave input combination of the bridge and the seismic isolation performance of the friction pendulum bearing have a deeper understanding, and some reasonable design suggestions for the seismic weak link similar to the bridge type are put forward.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U442.55

【相似文獻】

相關期刊論文 前10條

1 楊賀先,曹喜;天津乙烯工程大跨度管廊過河鋼拱橋設計[J];內(nèi)蒙古工業(yè)大學學報(自然科學版);2001年03期

2 程進,江見鯨,肖汝誠,項海帆;不同加載方式對大跨度鋼拱橋極限承載力的影響[J];公路交通科技;2003年01期

3 陳玲;;既有鋼拱橋混凝土超聲探測技術與評價[J];西部探礦工程;2007年12期

4 賴五照,張荻薇,曾榮川;雙層鋼拱橋的設計研究[J];福州大學學報(自然科學版);1997年S1期

5 程進,江見鯨,肖汝誠,項海帆;靜風荷載作用下大跨度鋼拱橋極限承載力分析[J];計算力學學報;2003年04期

6 程進,肖汝誠,夏e，

本文編號：1635454