本文選題：預(yù)應(yīng)力混凝土箱梁　切入點(diǎn)：結(jié)構(gòu)損傷　出處：《長(zhǎng)安大學(xué)》2014年碩士論文

【摘要】：預(yù)應(yīng)力混凝土箱形梁以其價(jià)廉、美觀、抗彎扭性能好等優(yōu)點(diǎn)在橋梁工程中得到廣泛應(yīng)用，在對(duì)已建成的橋梁進(jìn)行普查中，我國(guó)大多數(shù)橋梁都不同程度的出現(xiàn)過(guò)(主梁跨中位置下?lián)�，跨中正彎矩�(cái)嗝娉霈F(xiàn)下緣裂縫等)病害，造成了重大的經(jīng)濟(jì)損失和不利的社會(huì)影響，其中由預(yù)應(yīng)力引起箱梁開(kāi)裂的比例也較高，為此，本文針對(duì)縱向預(yù)應(yīng)力引起懸澆混凝土箱梁損傷及防治措施展開(kāi)研究。 首先，介紹了利用桿系計(jì)算軟件橋梁博士和精細(xì)化計(jì)算軟件MIDAS FEA等分析箱梁損傷的方法以及箱梁損傷檢測(cè)方法。在箱梁分析中整體計(jì)算采用桿系有限元模型，局部分析采用實(shí)體有限元模型。通過(guò)采用強(qiáng)大的有限元模型進(jìn)行箱梁分析，使得理論計(jì)算結(jié)果趨于精準(zhǔn)化。在混凝土箱梁施工過(guò)程中進(jìn)行損傷檢測(cè)，可以獲得箱梁內(nèi)部力學(xué)響應(yīng)即實(shí)測(cè)值。通過(guò)理論值和實(shí)測(cè)值對(duì)比，可以直觀明了的了解箱梁內(nèi)部力學(xué)響應(yīng)。 其次，研究了縱向預(yù)應(yīng)力引起腹板混凝土損傷的原因及防治措施，選擇一座案例橋進(jìn)行分析研究。調(diào)查箱梁腹板混凝土損傷結(jié)果，并對(duì)損傷的發(fā)展過(guò)程進(jìn)行數(shù)值模擬，得到引起損傷的敏感性參數(shù)及主要原因，并提出針對(duì)性的腹板損傷防治措施。 然后，研究了縱向預(yù)應(yīng)力引起底板混凝土損傷的原因及防治措施，結(jié)合一座案例橋進(jìn)行分析研究。調(diào)查箱梁底板混凝土損傷形式，并對(duì)設(shè)計(jì)方案和施工過(guò)程進(jìn)行數(shù)值模擬，得到引起損傷的敏感性參數(shù)及主要原因，并提出針對(duì)性的底板損傷防治措施。 最后，根據(jù)研究成果，在東吳大橋進(jìn)行成果運(yùn)用。 總之，本文研究縱向預(yù)應(yīng)力引起懸澆混凝土箱梁損傷的機(jī)理，并提出防治措施和建議，可有效解決懸澆混凝土箱梁損傷的典型病害問(wèn)題，對(duì)保障橋梁結(jié)構(gòu)的安全，，延長(zhǎng)橋梁的使用壽命，降低養(yǎng)護(hù)、維修、加固費(fèi)用，具有重要的意義。
[Abstract]:Prestressed concrete box girder has been widely used in bridge engineering with its advantages of low price, beautiful appearance and good flexural and torsional properties.Most bridges in our country have been damaged to some extent (the main beam deflection in the middle position and the lower edge crack in the middle moment section of the span), which has caused great economic loss and adverse social impact.The cracking rate of box girder caused by prestress is also high. Therefore, the damage caused by longitudinal prestress and the preventive measures are studied in this paper.Firstly, the methods to analyze the damage of box girder and the damage detection method of box girder are introduced, such as the bridge calculation software doctor and the refined calculation software MIDAS FEA.In the box girder analysis, the whole calculation adopts the finite element model of the bar system, and the local analysis adopts the solid finite element model.By using a powerful finite element model for box girder analysis, the theoretical results tend to be accurate.In the process of concrete box girder construction damage detection can obtain the internal mechanical response of box girder that is the measured value.By comparing the theoretical value with the measured value, the internal mechanical response of box girder can be understood intuitively and clearly.Secondly, the causes of web concrete damage caused by longitudinal prestress and the prevention measures are studied, and a case bridge is selected to analyze and study.The damage results of box girder web concrete were investigated and the damage development process was simulated numerically. The sensitive parameters and main causes of the damage were obtained and the corresponding measures for preventing and treating web damage were put forward.Then, the causes and prevention measures of concrete damage caused by longitudinal prestress are studied, and a case study is carried out.The concrete damage form of bottom slab of box girder is investigated, and the design scheme and construction process are numerically simulated. The sensitive parameters and main causes of the damage are obtained, and the corresponding measures to prevent and cure the damage of bottom slab are put forward.Finally, according to the research results, the results are applied in Soochow Bridge.In a word, this paper studies the mechanism of damage caused by longitudinal prestressed concrete box girder, and puts forward some preventive measures and suggestions, which can effectively solve the problem of typical damage of suspended concrete box girder and ensure the safety of bridge structure.It is of great significance to prolong the service life of bridges and reduce the maintenance, repair and reinforcement costs.
【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
【分類號(hào)】：U445.7

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