【摘要】：我國位于世界兩大地震帶之間,受太平洋板塊、印度板塊以及菲律賓海板塊的擠壓,地震斷裂帶十分發(fā)育,地震災(zāi)害嚴(yán)重。橋梁作為交通網(wǎng)絡(luò)的組成部分,在生命線抗震防災(zāi)體系中起著至關(guān)重要的作用,且大跨度橋梁與傳統(tǒng)橋梁相比,其投資更大、成本更高、施工過程也更加復(fù)雜,因此抗震要求也更高。滬通公鐵兩用長江大橋是一座正在建設(shè)的公鐵兩用大跨度斜拉橋,為中國沿海鐵路的過江通道。上層六車道公路為錫通高速公路,最大時(shí)速100 km/h,下層四線鐵路為通蘇嘉城際鐵路和滬通鐵路,最大時(shí)速200 km/h。該橋全長2300 m,跨徑達(dá)1092 m,建成后將成為世界最大跨度的公鐵兩用斜拉橋。一旦大橋受損坍塌,不但導(dǎo)致交通受阻,更會(huì)對(duì)災(zāi)后救援工作產(chǎn)生極不利影響,因此,對(duì)該橋進(jìn)行地震反應(yīng)分析具有十分重要的意義。本論文借助有限元軟件Midas Civil 2015,對(duì)滬通公鐵兩用長江大橋的抗震性能進(jìn)行分析,主要研究內(nèi)容包括:(1)建立了全橋空間有限元模型,對(duì)其自振特性進(jìn)行了分析。(2)確定了反應(yīng)譜參數(shù),對(duì)大橋進(jìn)行反應(yīng)譜分析計(jì)算。分析了在四種荷載工況(縱向輸入、橫向輸入、縱向+豎向輸入、橫向+豎向輸入)作用下的結(jié)構(gòu)響應(yīng),并著重討論了反應(yīng)譜進(jìn)行長周期修正后對(duì)結(jié)構(gòu)位移及內(nèi)力的影響。(3)選取了三組適合場地特征的地震波(EL Centro波、Taft波及人工模擬地震波),對(duì)大橋進(jìn)行一致地震時(shí)程分析,得到了結(jié)構(gòu)在縱向+豎向輸入、橫向+豎向輸入地震波作用下的地震響應(yīng),并與反應(yīng)譜法得到的結(jié)果進(jìn)行比較。(4)討論了非一致地震激勵(lì)下行波效應(yīng)對(duì)結(jié)構(gòu)地震響應(yīng)的影響,得到了不同視波速下結(jié)構(gòu)關(guān)鍵位置的位移及內(nèi)力響應(yīng),并與一致時(shí)程的結(jié)果進(jìn)行了比較。
[Abstract]:China is located between the two major seismic zones in the world. Due to the compression of the Pacific plate, the Indian plate and the Philippine sea plate, the seismic fault zone is well developed and the earthquake disaster is serious. As a part of traffic network, bridge plays an important role in lifeline seismic disaster prevention system. Compared with traditional bridges, long-span bridges have more investment, higher cost and more complex construction process. Therefore, the seismic requirements are also higher. Shanghai Stock Connect Bridge is a large span cable-stayed bridge which is under construction and is the crossing channel of China's coastal railway. The top six-lane highway is the Sitong Expressway, the maximum speed is 100 km/h, per hour, the lower four-lane railway is the Sujia Intercity Railway and the Shanghai Stock Connect Railway, the maximum speed is 200 km/h. per hour. The bridge is 2300 m in length and 1092 m in span. When completed, it will become the world's largest span of dual purpose cable-stayed bridge. Once the bridge is damaged and collapsed, it will not only cause traffic obstruction, but also have a very adverse impact on the rescue work after the disaster. Therefore, it is of great significance to analyze the seismic response of the bridge. With the help of the finite element software Midas Civil 2015, this paper analyzes the seismic behavior of the Shanghai-Stock Bridge, the main contents of which are as follows: (1) the spatial finite element model of the bridge is established. The natural vibration characteristics of the bridge are analyzed. (2) the parameters of the response spectrum are determined and the response spectrum of the bridge is calculated. The structural responses under four load conditions (longitudinal input, transverse input, longitudinal vertical input, transverse vertical input) are analyzed. The effects of long-period correction of response spectrum on the displacement and internal force of the structure are discussed. (3) three groups of seismic waves, (EL Centro wave, Taft wave and artificial simulated wave, are selected. The seismic response of the bridge subjected to vertical input and vertical input is obtained by means of uniform seismic time history analysis. And compared with the results obtained by response spectrum method. (4) the effect of traveling wave effect on structural seismic response under non-uniform earthquake excitation is discussed, and the displacement and internal force responses at different apparent wave velocities are obtained. The results are compared with the results of the same time course.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U442.55;U448.27

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本文編號(hào)：2389348