本文選題：PC連續(xù)箱梁　切入點：日照溫度　出處：《長安大學》2014年碩士論文　論文類型：學位論文

【摘要】：現階段高速公路及城市立交高速發(fā)展，橋梁工程建設工程也隨之進入到一個突飛猛進的發(fā)展階段。由于箱梁橋具有抗扭剛度大、在一定的截面面積下能獲得較大的抗彎慣矩的優(yōu)勢，，在近幾十年新建的橋梁結構形式中占了絕大多數。為適應我國交通事業(yè)的發(fā)展進步，越來越多的大跨徑橋梁如雨后春筍般出現，箱梁橋也成為大跨度連續(xù)梁橋和一些異形橋梁的主要結構形式。然而通過大量的調查研究表明，由太陽照射產生的溫度應力嚴重影響連續(xù)箱型梁橋的使用壽命，溫度在短時間內急劇變化是日照輻射溫度場的主要特點，這種急劇的溫度變化趨勢勢必會引起結構物表面和內部的溫度不均勻分布，將對結構物本身的耐久性和安全性產生重大的影響。本文以河北地區(qū)邢衡高速公路坂上互通AK0+315.2立交橋為工程實例，對該橋的溫度場進行觀測以期得到能較為精確反映該橋溫度場的試驗結果。 首先，本文系統全面地介紹了國內外專家學者對于溫度場及溫度效應的研究歷史和現狀，并詳細論述了溫度場研究過程中用到的理論知識和計算方法，針對PC連續(xù)箱梁橋溫度應力的求解計算也做了相關的闡述。 其次，根據現場的PC連續(xù)箱梁橋溫度場試驗數據，分析并總結了日照溫度作用下的PC連續(xù)箱梁各部位溫度場及PC連續(xù)箱梁結構內部水化熱溫度場的分布規(guī)律。在現場試驗的基礎上，運用Midas FEA結構分析軟件對該工程實例進行數值仿真分析，并將現場實測的反映結構溫度效應的應力應變值與軟件計算值進行比較分析，進一步驗證了前一階段提出的溫度場規(guī)律及溫度實測值的準確性。 針對PC連續(xù)箱梁橋施工過程中溫度效應對工程實際產生的裂縫影響，結合研究分析過程，在總結PC連續(xù)箱梁橋溫度場分布規(guī)律的基礎上，提出了一系列PC連續(xù)箱梁橋防止溫度裂縫形成發(fā)展的控制措施，對今后施工過程提供依據，有一定的參考價值。
[Abstract]:With the rapid development of expressway and urban interchange, the bridge construction project has entered a rapid development stage. Because of the large torsional stiffness of box girder bridge, In order to adapt to the development and progress of China's transportation industry, the advantage of obtaining greater bending inertia moment can be obtained under a certain cross-sectional area, which accounts for the vast majority of the newly built bridge structure forms in recent decades. More and more long-span bridges are springing up, and box girder bridges have become the main structural forms of long-span continuous girder bridges and some special-shaped bridges. The temperature stress caused by solar radiation seriously affects the service life of continuous box girder bridge, and the sharp change of temperature in a short time is the main characteristic of the temperature field of sunshine radiation. This sharp trend of temperature change will inevitably lead to uneven distribution of temperature on the surface and inside of the structure. It will have a great influence on the durability and safety of the structure itself. This paper takes the AK0 315.2 overpass of Xingheng Expressway in Hebei as an engineering example. The temperature field of the bridge is observed in order to obtain the experimental results which can accurately reflect the temperature field of the bridge. First of all, this paper systematically introduces the history and present situation of domestic and foreign experts and scholars on temperature field and temperature effect, and discusses in detail the theoretical knowledge and calculation method used in the research process of temperature field. The calculation of temperature stress of PC continuous box girder bridge is also discussed. Secondly, according to the temperature field test data of PC continuous box girder bridge, The distribution of temperature field of PC continuous box girder and the temperature field of hydration heat in PC continuous box girder structure under sunshine temperature are analyzed and summarized. The Midas FEA structural analysis software is used to simulate and analyze the engineering example, and the stress-strain values which reflect the temperature effect of the structure are compared with the calculated values of the software. Furthermore, the temperature field law and the accuracy of temperature measurement are verified. In view of the effect of temperature effect on the actual cracks of PC continuous box girder bridge during construction, combined with the research and analysis process, the temperature field distribution law of PC continuous box girder bridge is summarized. A series of control measures for PC continuous box girder bridge to prevent the formation and development of temperature cracks are put forward, which can provide the basis for the construction process in the future and have certain reference value.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441.5;U443.31

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