本文選題：高速鐵路 + 矮塔斜拉橋��； 參考：《西南交通大學》2017年碩士論文

【摘要】：矮塔斜拉橋在我國是一種較晚出現(xiàn)的橋型,但因為施工方便、剛度大、抗震性能良好等優(yōu)點,在我國得到了快速發(fā)展,尤其是在高速鐵路橋中,既滿足了剛度的需求又增加了橋梁的跨度。我國是地震多發(fā)區(qū),加上矮塔斜拉橋出現(xiàn)較晚,故對于該橋型的研究還不夠全面和深入,本論文以沅江矮塔斜拉橋為工程背景,利用有限元軟件MIDAS/CIVIL建立三維模型,對結(jié)構(gòu)進行靜力和動力特性兩個方面進行研究,得到如下結(jié)論:(1)模擬橋梁整個施工過程,對橋梁最大懸臂階段和成橋階段進行內(nèi)力和應力分析,驗算在成橋運營階段結(jié)構(gòu)應力分布、驗算列車活載下主梁撓度情況,均滿足規(guī)范要求。(2)選取在施工和成橋階段的十種參數(shù)變量,研究各參數(shù)對結(jié)構(gòu)主梁的位移、內(nèi)力以及索力影響,得到各參數(shù)對橋梁結(jié)構(gòu)的影響主次情況,保證施工安全可靠。(3)通過對橋梁進行反應譜分析,對比了歐洲規(guī)范和國內(nèi)規(guī)范對地震效應的組合方式,發(fā)現(xiàn)兩種組合的結(jié)果非常接近,在計算時可相互驗證結(jié)果的準確性。(4)將反應譜和時程的結(jié)果進行分析對比,得到兩種方法的優(yōu)缺點和使用范圍。采用相對位移法對結(jié)構(gòu)進行非一致激勵,發(fā)現(xiàn)在行波效應中,隨著波速的增大,其位移和內(nèi)力的結(jié)果趨近于一致激勵的結(jié)果。(5)對邊界條件進行非線性分析,確定摩擦減震支座的最優(yōu)參數(shù)為R=6m、u=0.07,發(fā)現(xiàn)設置減震支座時,橋墩位移和內(nèi)力有較大的減少,隔震性能良好;采用減震支座對橋梁結(jié)構(gòu)進行全橋隔震和連續(xù)墩隔震兩種方式進行布置,在考慮經(jīng)濟性時,可采用只在連續(xù)墩設置減震支座的方式。(6)通過對橋墩進行材料非線性分析,計算橋墩在最不利荷載下的屈服狀態(tài),得到橋墩在設計地震下均處于彈性狀態(tài),在罕遇地震下中墩底截面屈服,在設置減隔震支座后,橋墩不會發(fā)生大的破壞。
[Abstract]:The low tower cable-stayed bridge is a late type of bridge in our country, but it has been developed rapidly in our country, especially in high-speed railway bridge, because of the advantages of convenient construction, large stiffness and good seismic performance. It not only meets the demand of stiffness but also increases the span of bridge. China is an earthquake prone area, and the cable-stayed bridge with low tower appears late, so the research on this bridge is not comprehensive and deep enough. This paper takes Yuanjiang low tower cable-stayed bridge as the engineering background, using finite element software MIDAS/CIVIL to establish three-dimensional model. The static and dynamic characteristics of the structure are studied. The conclusions are as follows: 1) the whole construction process of the bridge is simulated, and the internal forces and stresses of the maximum cantilever stage and the completion stage of the bridge are analyzed. The structural stress distribution in the operation stage of the bridge is checked, and the deflection of the main beam under the live load of the train meets the requirements of the specification.) Ten parameter variables are selected in the construction and completion stages to study the displacement of each parameter to the main beam of the structure. Under the influence of internal force and cable force, the influence of each parameter on bridge structure is obtained, which ensures the safety and reliability of construction. By analyzing the response spectrum of bridge, the combination mode of seismic effect between European code and domestic code is compared. It is found that the results of the two combinations are very close. The accuracy of the results can be verified by each other in the calculation. (4) the results of the reaction spectrum and the time history are analyzed and compared, and the advantages and disadvantages of the two methods and the scope of their application are obtained. The relative displacement method is applied to the non-uniform excitation of the structure. It is found that in the traveling wave effect, with the increase of the velocity of the wave, the results of displacement and internal force approach to the result of uniform excitation. The optimum parameter of frictional shock absorber is R ~ (6) m ~ (U) ~ (0. 07). It is found that the displacement and internal force of bridge pier are greatly reduced and the isolation performance is good. The whole bridge isolation method and the continuous pier isolation method are used to arrange the bridge structure. When considering the economy, the method of setting the shock absorber support only in the continuous pier can be used to analyze the material nonlinearity of the bridge pier. By calculating the yield state of the pier under the most unfavorable load, it is concluded that the pier is elastic under the design earthquake, and the bottom section of the pier is yielding under the rare earthquake, and the pier will not be destroyed greatly after the isolation support is installed.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U448.27

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