本文關(guān)鍵詞： 鐵路橋 特大跨度 施工 頂推 力學(xué)分析 監(jiān)控　出處：《合肥工業(yè)大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著鐵路運(yùn)輸?shù)陌l(fā)展和橋梁施工技術(shù)的提高，大跨度鐵路橋也隨之得到越來(lái)越多的應(yīng)用。為了保證橋梁結(jié)構(gòu)在施工過(guò)程中的安全以及成橋線形與設(shè)計(jì)很好的吻合，施工監(jiān)控受到越來(lái)越多的重視。南淝河特大跨度鐵路橋（114.75m+229.5m+114.75m）為下承式、連續(xù)鋼桁梁柔性拱橋，采用單邊帶拱頂推、拱腳合龍的新施工方案。本文以南淝河特大跨度鐵路橋施工為研究背景，通過(guò)建立該橋梁施工過(guò)程中各施工階段的空間結(jié)構(gòu)力學(xué)模型，采用有限元法對(duì)結(jié)構(gòu)應(yīng)力、線形以及穩(wěn)定性等進(jìn)行力學(xué)分析，由此對(duì)施工過(guò)程提供安全性預(yù)測(cè)和監(jiān)控實(shí)施。依據(jù)計(jì)算結(jié)果對(duì)危險(xiǎn)施工工況的超應(yīng)力桿件提出了加固措施，確保了橋梁結(jié)構(gòu)滿(mǎn)足應(yīng)力強(qiáng)度和穩(wěn)定性的安全要求。對(duì)施工過(guò)程的重點(diǎn)關(guān)注構(gòu)件進(jìn)行了應(yīng)力監(jiān)測(cè)，各施工工況中較大應(yīng)力桿件的實(shí)測(cè)值和有限元計(jì)算值較吻合，，成橋線形符合設(shè)計(jì)與規(guī)范要求，表明本文工作對(duì)特大跨度鋼橋施工過(guò)程的力學(xué)分析和監(jiān)控實(shí)施的效果良好，可為同類(lèi)型橋梁的施工提供技術(shù)參考。
[Abstract]:With the development of railway transportation and the improvement of bridge construction technology. In order to ensure the safety of the bridge structure in the construction process and the bridge alignment with the design is very good. More and more attention has been paid to construction monitoring. Nanfeihe River large span railway bridge (114.75m 229.5m 114.75m) is a through, continuous steel truss flexible arch bridge. This paper takes the construction of Nanfeihe River large span railway bridge as the research background and establishes the spatial structural mechanics model of each construction stage of the bridge. The finite element method is used to analyze the stress, linear and stability of the structure. According to the calculation results, the reinforcement measures for the overstress members in dangerous construction conditions are put forward. It ensures that the bridge structure meets the safety requirements of stress intensity and stability. The stress monitoring of the key members in the construction process is carried out. The measured values of the larger stress members in each construction condition are in good agreement with the finite element calculation values. The alignment of the completed bridge meets the requirements of the design and code, which indicates that the work in this paper has a good effect on the mechanical analysis and monitoring of the construction process of the long-span steel bridge, and can provide a technical reference for the construction of the same type of bridge.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U448.22

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