本文選題：四線重載 + 鋼桁斜拉橋��； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：隨著國(guó)家高鐵網(wǎng)建設(shè)步伐的加快,斜拉橋成為跨越江河峽谷的合理選擇。斜拉橋作為一種柔性結(jié)構(gòu)如何適應(yīng)鐵路活載大的特點(diǎn)從而保證列車運(yùn)行安全性與平穩(wěn)性成為日益重要的研究課題。論文以國(guó)內(nèi)某四線高速鐵路重載鋼桁梁斜拉橋?yàn)楸尘?此橋是國(guó)內(nèi)首座采用兩片主桁的四線大跨度寬桁鐵路斜拉橋。論文結(jié)合設(shè)計(jì)進(jìn)行靜力分析與動(dòng)力分析,主要對(duì)結(jié)構(gòu)受力特性、靜活載作用下的結(jié)構(gòu)受力與變形情況、結(jié)構(gòu)自振特性和地震荷載作用下的結(jié)構(gòu)響應(yīng)及靜風(fēng)荷載、列車荷載作用下結(jié)構(gòu)的穩(wěn)定性進(jìn)行相關(guān)研究。研究?jī)?nèi)容主要包括以下幾個(gè)方面：(1)運(yùn)用計(jì)算軟件Midas Civil 2012建立基于梁?jiǎn)卧�、索單元和板單元的全橋三維有限元模型；計(jì)算分析橋梁施工階段的受力和變形,分析中考慮混凝土收縮徐變因素的影響。(2)計(jì)算分析四線鐵路活載、風(fēng)荷載、溫度荷載與基礎(chǔ)不均勻沉降等各單獨(dú)工況與不同組合工況作用下橋塔、鋼主梁和拉索受力狀況,提出優(yōu)化構(gòu)件受力狀態(tài)的建議。(3)利用子空問迭代法計(jì)算結(jié)構(gòu)自振特性,運(yùn)用反應(yīng)譜和時(shí)程分析兩種方法對(duì)結(jié)構(gòu)進(jìn)行地震響應(yīng)計(jì)算分析；(4)計(jì)算分析施工階段和運(yùn)營(yíng)階段橋梁的彈性穩(wěn)定性,得出了橋梁從施工到運(yùn)營(yíng)階段橋梁結(jié)構(gòu)穩(wěn)定性均滿足要求的結(jié)論。
[Abstract]:With the acceleration of national high-speed rail network construction, cable-stayed bridges become a reasonable choice across river canyons. As a flexible structure, cable-stayed bridge has become an increasingly important research topic how to adapt to the characteristics of large live load of railway and ensure the safety and stability of train operation. In this paper, a four-line high speed railway heavy load steel truss cable-stayed bridge is taken as the background. This bridge is the first four-line large-span girder cable-stayed bridge with two main trusses in our country. Based on the static and dynamic analysis of the design, this paper mainly deals with the structural stress characteristics, the structure stress and deformation under the static and live load, the structure natural vibration characteristics and the structural response and static wind load under the earthquake load. The stability of the structure under train load is studied. The main contents of the research include the following aspects: 1) using the software Midas Civil 2012 to establish the 3D finite element model of the whole bridge based on the beam element, cable element and plate element, and to calculate and analyze the force and deformation of the bridge during the construction stage. In the analysis, considering the influence of concrete shrinkage and creep factors, the calculation and analysis of the stress condition of bridge tower, steel main beam and cable under the action of single working condition, wind load, temperature load and uneven settlement of foundation, etc. The suggestion of optimizing the stress state of the structure is put forward. The subspace iterative method is used to calculate the natural vibration characteristics of the structure, and the response spectrum and time history analysis are used to calculate and analyze the seismic response of the structure. Finally, the elastic stability of the bridge in the construction and operation stages is analyzed, and the conclusion is drawn that the stability of the bridge structure meets the requirements from the construction stage to the operation stage.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441;U448.27

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