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  本文選題：混凝土橋塔 + 豎向裂縫��； 參考：《長安大學》2015年碩士論文

【摘要】：近些年來斜拉橋、懸索橋混凝土橋塔在使用過程中出現(xiàn)了很多裂縫,這些裂縫主要為豎向裂縫。經(jīng)初步判斷,在諸多引起混凝土橋塔產(chǎn)生豎向裂縫的因素中,溫變效應是一個重要的影響因素。國內(nèi)外學者在混凝土橋梁上部結(jié)構(gòu)裂縫與溫變效應方面做了大量的研究工作,提出了一系列有關(guān)混凝土結(jié)構(gòu)裂縫和溫度應力的計算方法,但是在混凝土橋塔豎向裂縫與溫變效應方面的研究還沒有一套完整的理論供實際工程參考,仍存在需要進一步研究的內(nèi)容。本文通過對某一混凝土橋塔溫度場和裂縫變化進行實際觀測并建立有限元模型,對混凝土橋塔的溫度場分布、應力場分布、裂縫分布形態(tài)及其影響因素和防裂修復措施進行了詳細的研究。主要內(nèi)容包括:1、論述了國內(nèi)外混凝土橋梁溫度場分布、溫度應力及裂縫的研究現(xiàn)狀,提出了研究中存在的不足之處,歸納總結(jié)了國內(nèi)外混凝土結(jié)構(gòu)溫變效應和斷裂力學相關(guān)理論。2、以某一混凝土橋塔作為研究對象,觀測了冬春兩季混凝土橋塔的溫度場分布情況及裂縫寬度隨溫度變化的擴展閉合狀態(tài),對溫度場隨時間的變化情況進行了分析。3、建立了橋塔實體模型,對橋塔結(jié)構(gòu)沿高度方向和截面長寬方向的應力分布情況進行了計算分析,驗證了溫變效應是引起混凝土橋塔產(chǎn)生豎向裂縫的重要因素這一判斷。4、基于混凝土結(jié)構(gòu)斷裂力學和溫變效應理論,結(jié)合橋塔豎向裂縫的觀測數(shù)據(jù)建立存在豎向裂縫的混凝土橋塔節(jié)段模型,對裂縫在不同溫差荷載工況下的寬度變化進行計算分析。分析總結(jié)了溫變條件下豎向裂縫寬度值變化情況。5、分析了除溫變效應以外,引起混凝土橋塔產(chǎn)生豎向裂縫的原因并從設(shè)計、施工兩個階段出發(fā)提供了相應的裂縫控制措施。最后根據(jù)裂縫不同的開裂程度,提供了相應的修復方法。
[Abstract]:In recent years, there are many cracks in the concrete tower of suspension bridge, which are mainly vertical cracks. It is preliminarily judged that among the factors causing vertical cracks in concrete bridge towers, temperature variation is an important factor. Scholars at home and abroad have done a lot of research on crack and temperature variation effect of superstructure of concrete bridge, and put forward a series of calculation methods about crack and temperature stress of concrete structure. However, the research on vertical crack and temperature variation of concrete bridge tower is not a complete theory for practical engineering reference, there is still need for further research content. By observing the temperature field and crack change of a concrete bridge tower and establishing the finite element model, the distribution of temperature field and stress field of concrete bridge tower is studied in this paper. The distribution of cracks and its influencing factors and anti-crack repair measures were studied in detail. The main contents include: 1. The research status of temperature field distribution, temperature stress and crack of concrete bridges at home and abroad are discussed, and the shortcomings of the research are put forward. The related theories of temperature variation and fracture mechanics of concrete structures at home and abroad are summarized. A concrete bridge tower is taken as the research object. The distribution of temperature field and the propagation and closing state of crack width with temperature are observed. The variation of temperature field with time is analyzed, and the solid model of bridge tower is established. The stress distribution of the tower structure along the direction of height and length and width of section is calculated and analyzed. Based on the theory of fracture mechanics and temperature variation effect of concrete structure, the conclusion that temperature variation effect is an important factor causing vertical crack in concrete bridge tower is verified. Based on the observation data of vertical cracks of bridge tower, the section model of concrete tower with vertical cracks is established, and the width variation of cracks under different temperature difference load conditions is calculated and analyzed. In this paper, the variation of vertical crack width under the condition of temperature variation is summarized. Besides the temperature variation effect, the causes of vertical crack in concrete bridge tower are analyzed, and the corresponding crack control measures are provided from the two stages of design and construction. Finally, according to the different crack degree, the corresponding repair method is provided.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441;U443.38

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相關(guān)期刊論文 前1條

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本文編號：1918971