本文選題：預(yù)應(yīng)力混凝土連續(xù)梁橋　切入點(diǎn)：加固　出處：《長安大學(xué)》2015年碩士論文

【摘要】：上世紀(jì)中后期,世界各國建設(shè)了大量的預(yù)應(yīng)力混凝土連續(xù)梁橋。目前,國內(nèi)外建設(shè)的大跨度預(yù)應(yīng)力混凝土連續(xù)梁橋普遍存在梁體開裂和跨中下?lián)系膯栴}。本論文以我國目前現(xiàn)存的預(yù)應(yīng)力混凝土連續(xù)梁橋現(xiàn)狀出發(fā),分析了預(yù)應(yīng)力混凝土連續(xù)梁橋的常見病害,通過有限元軟件對(duì)大跨度預(yù)應(yīng)力混凝土連續(xù)梁橋的跨中下?lián)系挠绊懸蛩剡M(jìn)行分析。針對(duì)預(yù)應(yīng)力混凝土連續(xù)梁橋跨中下?lián)虾土后w開裂,在總結(jié)該類橋梁常見上部結(jié)構(gòu)及下部結(jié)構(gòu)加固方法的基礎(chǔ)上,通過對(duì)河南某預(yù)應(yīng)力混凝土連續(xù)梁橋采用附加拱式加固體系進(jìn)行加固分析,并重點(diǎn)闡述了附加拱式加固方法的基本原理、施工方法、施工關(guān)鍵步驟。具體研究的內(nèi)容主要包括:1)通過對(duì)預(yù)應(yīng)力混凝土連續(xù)梁橋主要病害(箱梁開裂和跨中下?lián)?的成因進(jìn)行詳細(xì)的分析,并對(duì)主要病害提出了相應(yīng)的處理措施。2)本文分析預(yù)應(yīng)力混凝土連續(xù)梁橋的跨中下?lián)系挠绊懸蛩?并重點(diǎn)分析了混凝土的收縮徐變、預(yù)應(yīng)力損失、結(jié)構(gòu)剛度降低對(duì)預(yù)應(yīng)力混凝土連續(xù)梁橋跨中下?lián)线M(jìn)行有限元模擬分析。結(jié)果表明,混凝土收縮徐變、預(yù)應(yīng)力損失以及結(jié)構(gòu)剛度降低是影響預(yù)應(yīng)力混凝土連續(xù)梁橋跨中下?lián)系闹匾蛩亍?)在總結(jié)預(yù)應(yīng)力混凝土連續(xù)梁橋常見加固方法的基礎(chǔ)上,闡述了附加拱式加固法,并通過與其他加固方法作對(duì)比,本研究對(duì)預(yù)應(yīng)力混凝土連續(xù)梁橋的跨中下?lián)蠁栴}采用附加拱式加固方法,并重點(diǎn)介紹該加固方法的基本原理與構(gòu)造理論、有限元模擬過程、施工方法及關(guān)鍵施工工序。4)通過對(duì)某一病害橋梁為工程研究背景,對(duì)其病害采用附加拱式加固法實(shí)現(xiàn)加固,并通過對(duì)其加固前、加固后的模型進(jìn)行靜力分析及動(dòng)力分析,重點(diǎn)分析比較加固前后的應(yīng)力及變形。結(jié)果表明附加拱式加固法可以有效改善橋梁的內(nèi)力狀態(tài),抑制跨中持續(xù)下?lián)?提高橋梁的服務(wù)水平,延長橋梁的使用壽命。
[Abstract]:In the middle and late of last century, a large number of prestressed concrete continuous beam bridges were built around the world. The problems of beam cracking and mid-span deflection are common in long-span prestressed concrete continuous beam bridges built at home and abroad. This paper starts from the existing situation of prestressed concrete continuous beam bridges in China. This paper analyzes the common diseases of prestressed concrete continuous beam bridge, and analyzes the influencing factors of mid-span deflection of long-span prestressed concrete continuous beam bridge by finite element software, aiming at the mid-span deflection and beam body cracking of prestressed concrete continuous beam bridge. On the basis of summing up the common superstructure and substructure reinforcement method of this kind of bridge, the reinforcement analysis of a prestressed concrete continuous beam bridge in Henan Province is carried out by using additional arch reinforcement system. The basic principle and construction method of the additional arch reinforcement method are expounded in detail. The key steps of construction. The specific research contents mainly include: 1) through the detailed analysis of the causes of the main diseases of prestressed concrete continuous beam bridge (box girder cracking and mid-span deflection), In this paper, the influencing factors of the deflection of prestressed concrete continuous beam bridge are analyzed, and the shrinkage and creep of concrete and the loss of prestressing force are analyzed. The finite element simulation analysis of the deflection of prestressed concrete continuous beam is carried out by reducing the stiffness of the structure. The results show that the shrinkage and creep of concrete are obtained. The loss of prestress and the reduction of structural stiffness are the important factors affecting the deflection of prestressed concrete continuous beam bridge span. 3) on the basis of summing up the common reinforcement methods of prestressed concrete continuous beam bridge, the additional arch reinforcement method is expounded. By comparing with other reinforcement methods, this study adopts the additional arch reinforcement method for the deflection problem of prestressed concrete continuous beam bridge, and introduces the basic principle and construction theory of the reinforcement method and the process of finite element simulation. Construction method and key construction procedure .4) through the engineering research background of a diseased bridge, the additional arch reinforcement method is used to reinforce the disease, and the static and dynamic analysis of the model before and after reinforcement is carried out. The stress and deformation of the bridge before and after reinforcement are analyzed and compared. The results show that the additional arch reinforcement method can effectively improve the internal force state of the bridge, restrain the continuous deflection in the span, improve the service level of the bridge, and prolong the service life of the bridge.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U445.72

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本文編號(hào)：1689786