本文關(guān)鍵詞： 寬翼緣箱梁 應(yīng)力 裂縫成因分析 加固方法 體外預(yù)應(yīng)力　出處：《長(zhǎng)安大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：預(yù)應(yīng)力混凝土連續(xù)箱梁橋由于其諸多優(yōu)點(diǎn)被廣泛應(yīng)用于國(guó)內(nèi)外橋梁中，但是隨著我國(guó)交通量的急劇增加，，該橋型出現(xiàn)病害的現(xiàn)象越來(lái)越普遍，其中尤以裂縫問(wèn)題最為突出。本文主要以某寬翼緣預(yù)應(yīng)力混凝土連續(xù)箱梁為工程背景，進(jìn)行結(jié)構(gòu)計(jì)算分析其裂縫成因，同時(shí)對(duì)裂縫的維修加固方案進(jìn)行研究。本文主要研究?jī)?nèi)容如下： （1）對(duì)箱梁的計(jì)算理論進(jìn)行了研究分析,詳細(xì)論述了箱梁力學(xué)特性及分析方法,然后對(duì)寬翼緣箱梁的彎曲應(yīng)力、剪力滯效應(yīng)、剛性扭轉(zhuǎn)、畸變效應(yīng)、溫度效應(yīng)及收縮徐變效應(yīng)的計(jì)算分別進(jìn)行了理論分析研究。 （2）采用Midas/Civil的剪力—柔性梁格法并考慮剪力滯后效應(yīng)，按照B類(lèi)預(yù)應(yīng)力構(gòu)件計(jì)算原則，對(duì)該橋進(jìn)行模擬計(jì)算分析。分別從恒載、活載、溫度效應(yīng)、收縮徐變作用等方面來(lái)分析其控制截面的應(yīng)力結(jié)果，計(jì)算結(jié)果表明主梁的應(yīng)力均符合規(guī)范要求。 （3）考慮舊橋修正系數(shù)、部分預(yù)應(yīng)力管道壓漿不飽滿(mǎn)、鋼筋上浮及鋼絞線松弛等因素的影響，截面計(jì)算偏安全地按照對(duì)其鋼絞線設(shè)計(jì)強(qiáng)度進(jìn)行20%折減進(jìn)行修正計(jì)算。計(jì)算結(jié)果表明：在主跨跨中截面下緣產(chǎn)生最大的法向拉應(yīng)力和最大主拉應(yīng)力，嚴(yán)重超出規(guī)范限值。結(jié)合計(jì)算結(jié)果分析頂、底板和腹板裂縫產(chǎn)生的原因。最后對(duì)底板結(jié)構(gòu)性橫向裂縫提出兩種加固方案，并對(duì)既定方案—體外預(yù)應(yīng)力加固法進(jìn)行加固后的結(jié)構(gòu)計(jì)算分析，結(jié)果表明加固后的主梁的應(yīng)力情況得到很大改善，最大主拉應(yīng)力提高34.2%，應(yīng)力曲線變化較為均勻，且均滿(mǎn)足規(guī)范要求。 本文對(duì)具有斜交跨的寬翼緣預(yù)應(yīng)力混凝土連續(xù)箱梁橋的裂縫成因及加固方法做了初步的分析研究，對(duì)其它同類(lèi)型橋梁的維修加固具有現(xiàn)實(shí)的借鑒意義。
[Abstract]:Prestressed concrete continuous box girder bridge is widely used in bridges at home and abroad because of its many advantages. However, with the rapid increase of traffic volume in China, the phenomenon of bridge type disease is becoming more and more common. The crack problem is the most prominent one. In this paper, the structural calculation and analysis of the causes of the crack are carried out, taking the prestressed concrete continuous box girder with a wide flange as the engineering background. The main contents of this paper are as follows:. 1) the calculation theory of box girder is studied and analyzed, and the mechanical characteristics and analysis method of box girder are discussed in detail. Then, the bending stress, shear lag effect, rigid torsion and distortion effect of wide flange box girder are analyzed. The calculation of temperature effect and shrinkage creep effect are studied theoretically. (2) adopting Midas/Civil 's shear flexible beam method and considering the lag effect of shear force, the bridge is simulated and analyzed according to the calculation principle of class B prestressed members. The effects of dead load, live load and temperature are analyzed respectively. The stress results of the control section are analyzed from the aspects of shrinkage and creep. The calculation results show that the stress of the main beam meets the requirements of the code. (3) considering the influence of the correction coefficient of the old bridge, the partial prestressing pipe grouting is not full, the steel bar floats and the steel strands are relaxed and so on, The section calculation is calculated safely according to the 20% reduction of the design strength of the steel strand. The calculation results show that the maximum normal tensile stress and the maximum main tensile stress are produced at the lower edge of the middle section of the main span. The causes of cracks in top, bottom and web are analyzed in combination with the calculation results. Finally, two kinds of reinforcement schemes are proposed for structural transverse cracks of floor. The results show that the stress of the strengthened main beam is greatly improved, the maximum principal tensile stress is increased by 34.2%, and the stress curve is more uniform. And all meet the specification requirements. In this paper, the causes of cracks and reinforcement methods of prestressed concrete continuous box girder bridge with wide flange with skew span are analyzed and studied, which is of practical significance for the maintenance and reinforcement of other bridges of the same type.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U445.7

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本文編號(hào)：1511136