本文關(guān)鍵詞：帶協(xié)作跨預應力混凝土斜拉橋裂縫成因分析及防治對策　出處：《長安大學》2016年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 協(xié)作體系混凝土斜拉橋 有限元 溫度荷載 收縮徐變 車輛作用 裂縫成因

【摘要】：帶協(xié)作跨的預應力混凝土斜拉橋由于其良好的經(jīng)濟性、穩(wěn)定性以及施工便利性在工程中得到廣泛的應用,而在施工、運營過程中的開裂問題一直是困擾工程界的重要問題。文章以某帶協(xié)作跨的預應力混凝土斜拉橋為工程背景,采用有限元分析軟件Midas Civil和Midas FEA建立全橋的整體有限元模型和局部有限元模型,對其裂縫成因進行了仿真分析,主要完成了以下工作:(1)通過試驗檢測,對該橋在檢測過程中發(fā)現(xiàn)的裂縫進行統(tǒng)計,發(fā)現(xiàn)兩側(cè)協(xié)作跨以及主跨無索區(qū)開裂較為嚴重,主要表現(xiàn)為腹板開裂以及少數(shù)底板裂縫。腹板斜裂縫較多,尤其在21#墩兩側(cè)的分布較為規(guī)律,主跨無索區(qū)和西側(cè)協(xié)作跨的腹板裂縫在墩截面兩側(cè)基本呈現(xiàn)對稱分布規(guī)律。(2)采用有限元分析軟件Midas Civil建立全橋模型,模擬其施工階段,對其成橋受力狀態(tài)和運營階段的受力狀態(tài)進行了分析,研究表明:協(xié)作跨以及主跨無索區(qū)的壓應力要小于有索區(qū)的壓應力,在其他不利因素的作用下,容易導致協(xié)作跨和主跨無索區(qū)產(chǎn)生裂縫。(3)利用整體有限元模型詳細分析由于溫度、基礎(chǔ)沉降、收縮徐變、車輛荷載等因素對裂縫成因的貢獻作用,得出其主要影響因素。研究結(jié)果表明:兩側(cè)協(xié)作跨的超載和溫度作用是導致該協(xié)作體系斜拉橋產(chǎn)生裂縫的主要因素。(4)采用有限元分析軟件Midas FEA建立局部有限元模型,考慮了混凝土和鋼筋的材料非線性,對荷載作用下主梁的受力狀態(tài)進行分析,研究結(jié)果表明:在溫度和超載作用下,主梁的腹板在橋墩截面兩側(cè)出現(xiàn)了較大的主拉應力,開裂位置與實際檢測結(jié)果基本吻合。本文的研究對于協(xié)作體系混凝土斜拉橋的裂縫成因及裂縫控制具有重要的參考意義。
[Abstract]:Prestressed concrete cable-stayed bridge with cooperative span is widely used in construction because of its good economy, stability and construction convenience. The cracking problem in operation is always an important problem in the engineering field. This paper takes a prestressed concrete cable-stayed bridge with cooperative span as the engineering background. The integral finite element model and local finite element model of the whole bridge are established by using the finite element analysis software Midas Civil and Midas FEA, and the causes of the cracks are simulated and analyzed. Mainly completed the following work: 1) through the test of the bridge in the process of detection of cracks found in statistics, found that the two sides of the cooperative span and the main span without cable cracking is more serious. The main manifestations are web cracking and a few cracks in the bottom plate. There are more inclined cracks in the web, especially on the two sides of the 21# pier. The web crack of the main span without cable and the west side cooperative span basically presents the symmetrical distribution law on both sides of the pier section.) the finite element analysis software Midas Civil is used to establish the full bridge model. The stress state of the bridge and the operation stage are analyzed. The results show that the compressive stress of the cooperative span and the main span is smaller than that of the cable zone. Under the action of other unfavorable factors, it is easy to cause cracks in the non-cable zone of cooperative span and main span.) the integral finite element model is used to analyze in detail the shrinkage and creep due to temperature, foundation settlement and creep. The contribution of vehicle load and other factors to the cause of cracks. The main influencing factors are obtained. The results show that the overloading and temperature action of the bilateral cooperative span are the main factors leading to the cracks of the cable-stayed bridge. The local finite element model is established by using the finite element analysis software Midas FEA. Considering the material nonlinearity of concrete and steel bar, the stress state of the main beam under load is analyzed. The results show that: under the action of temperature and overload. The web plate of the main beam has a large main tensile stress on both sides of the section of the pier. The crack location is basically consistent with the actual detection results. The research in this paper has important reference significance for the crack formation and crack control of the concrete cable-stayed bridge with cooperative system.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U445.57;U448.27

【參考文獻】

相關(guān)期刊論文 前10條

1 金衛(wèi)兵;胡洋;彭德運;;某PC斜拉橋錨塊及斜腹板裂縫成因分析[J];中外公路;2011年05期

2 杜在松;;某斜拉橋現(xiàn)澆預應力箱梁裂縫產(chǎn)生原因分析及對策[J];北方交通;2010年08期

3 荊國強;李欣然;陳德偉;;預應力混凝土斜拉橋塔梁臨時固結(jié)構(gòu)造空間受力分析[J];橋梁建設(shè);2009年06期

4 王國亮;謝峻;傅宇方;;在用大跨度預應力混凝土箱梁橋裂縫調(diào)查研究[J];公路交通科技;2008年08期

5 溫慶杰;葉見曙;;新舊混凝土梁橫向拼接的收縮徐變效應[J];中國公路學報;2007年04期

6 劉桂生;劉慧敏;;大跨徑箱梁橋裂縫成因分析及控制措施[J];公路;2006年08期

7 陳明憲;;斜拉橋的發(fā)展與展望[J];中外公路;2006年04期

8 余報楚;張哲;張洪金;;金馬大橋主梁橫隔梁受力分析與預應力施工技術(shù)[J];公路交通科技;2006年01期

9 王斐峰,葉見曙,鄧學鈞,孫獻國,安長軍,鐘原;預應力混凝土斜拉橋主梁邊箱足尺模型試驗[J];公路交通科技;2005年07期

10 王毅,葉見曙,顧祥峰;橫梁預應力束的平彎對混凝土斜拉橋邊箱斜腹板的影響[J];交通運輸工程學報;2005年02期

，

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