【摘要】：隨著大跨橋梁結(jié)構(gòu)的應(yīng)用與發(fā)展,其耐久性成為人們關(guān)注的焦點。斜拉橋因其造型美觀、受力合理而被廣泛建造。在建成多年的大跨斜拉橋中,鋼筋銹蝕、拉索腐蝕等是此類結(jié)構(gòu)耐久性失效形式中最為嚴(yán)重的類型,也是其破壞的主要原因。因此,定期檢測大跨預(yù)應(yīng)力混凝土斜拉橋顯得尤為重要。目前已有的檢測技術(shù)主要有破損檢測技術(shù)、半破損檢測技術(shù)和無損檢測技術(shù)三大類。本文著重詳細(xì)地介紹了預(yù)應(yīng)力混凝土斜拉橋混凝土強度和拉索索力檢測的方法,包括回彈法、超聲回彈綜合法、鉆芯法檢測混凝土的強度;基頻法、千斤頂壓力表測定法測斜拉索的索力。論文以重慶某斜拉橋為例,完成了斜拉橋混凝土強度檢測以及恒載下索力檢測,然后將這些方法的檢測結(jié)果進行對比分析,擬合出一個公式使檢測值更接近于真實值,并根據(jù)檢測結(jié)果對在役斜拉橋的運營狀況進行評估,再針對評估結(jié)果提出相應(yīng)的加固養(yǎng)護建議,為后續(xù)預(yù)應(yīng)力混凝土斜拉橋檢測提供了參考。
[Abstract]:With the application and development of long span bridge structure, its durability has become the focus of attention. The cable-stayed bridge is widely built because of its beautiful shape and reasonable force. In the long-span cable-stayed bridge which has been built for many years the corrosion of steel bars and cables is the most serious type of durability failure of this kind of structure and the main reason of its failure. Therefore, it is very important to detect long-span prestressed concrete cable-stayed bridge regularly. At present, there are three kinds of detection techniques: damage detection, semi-damage detection and non-destructive testing. In this paper, the testing methods of concrete strength and cable force of prestressed concrete cable-stayed bridge are introduced in detail, including springback method, ultrasonic springback synthesis method, drill core method to detect concrete strength, fundamental frequency method, and so on. Determination of cable force of stay cables by Jack pressure gauge. Taking a cable-stayed bridge in Chongqing as an example, the concrete strength detection of cable-stayed bridge and cable force detection under dead load are completed. Then the test results of these methods are compared and analyzed, and a formula is fitted to make the detection value closer to the real value. According to the test results, the operation condition of the cable-stayed bridge in service is evaluated, and the corresponding reinforcement and maintenance suggestions are put forward in view of the evaluation result, which provides a reference for the subsequent detection of the prestressed concrete cable-stayed bridge.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U446;U448.27

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