發(fā)布時(shí)間：2018-03-19 18:21

  本文選題：鋼拱橋　切入點(diǎn)：抗震分析　出處：《蘭州交通大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：進(jìn)入二十一世紀(jì)以來(lái),隨著我國(guó)拱橋施工技術(shù)的日益成熟及鋼鐵冶煉技術(shù)的迅猛發(fā)展,我國(guó)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(shí)由于具有較高的強(qiáng)度比,因此能夠設(shè)計(jì)成大跨度橋梁。鋼拱橋還有結(jié)構(gòu)形式優(yōu)美的特點(diǎn),因此在橋梁建設(shè)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(yīng)用。本論文依托蘭州市一座下承式鋼拱橋?yàn)楣こ瘫尘?懫用MIDAS/CIVIL有限元軟件建立全橋空間模型,研究其地震反應(yīng)。主要研究?jī)?nèi)容有以下幾個(gè)方面:(1)首先介紹了國(guó)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(diǎn)。其次根據(jù)目前橋梁抗震設(shè)計(jì)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(yīng)分析提供了一定的理論基礎(chǔ)。(2)根據(jù)結(jié)構(gòu)動(dòng)力學(xué)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(jì)算模型,對(duì)該橋自振特性進(jìn)行研究。分析過(guò)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(duì)該橋動(dòng)力特性的影響。(3)在動(dòng)力特性分析的基礎(chǔ)上,依據(jù)該橋安評(píng)報(bào)告確定反應(yīng)譜曲線(xiàn),并采用反應(yīng)譜分析方法進(jìn)行抗震計(jì)算。在E1地震動(dòng)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(yīng)分析對(duì)比,探討不同地震動(dòng)輸入方式及拱肋傾角對(duì)大跨度鋼拱橋反應(yīng)譜分析結(jié)果的影響。(4)在罕遇地震下,采用非線(xiàn)性動(dòng)力時(shí)程分析法,對(duì)該橋在一致激勵(lì)下分別按縱向和橫向兩種輸入方式輸入三條強(qiáng)震記錄地震波,進(jìn)行不同輸入方式下的地震反應(yīng)分析對(duì)比。結(jié)合摩擦擺支座(FPB)的相關(guān)力學(xué)模型及計(jì)算參數(shù),對(duì)使用了摩擦擺支座的模型進(jìn)行時(shí)程分析,探討了FPB支座的減隔震效果。通過(guò)對(duì)以上問(wèn)題的分析研究,對(duì)該鋼拱橋的動(dòng)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(rèn)識(shí),并對(duì)類(lèi)似橋型的抗震薄弱環(huán)節(jié)提出合理化的設(shè)計(jì)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(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U442.55

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本文編號(hào)：1635454