【摘要】：公路橋梁在國民經(jīng)濟、文化、技術(shù)、環(huán)境和國防方面均有著至關(guān)重要的作用，確保橋梁結(jié)構(gòu)安全運營是橋梁工作者必須面對的問題。混凝土橋梁在自然環(huán)境（如洪水、大風(fēng)、凍融等）和人為因素（工程質(zhì)量不佳、超載等）綜合作用下，結(jié)構(gòu)性能會逐漸衰減，造成承載能力不足而影響橋梁的可靠性與安全性。如何確定混凝土橋梁殘余承載能力，對結(jié)構(gòu)工作狀態(tài)進行無損檢測評定，實施必要的維修與加固，是保證結(jié)構(gòu)安全運營、節(jié)約經(jīng)濟投入的關(guān)鍵技術(shù)問題。針對我國公路危橋數(shù)量逐年增加，而交通量與車輛荷載不斷發(fā)生變化的基本趨勢，豐富和完善混凝土梁橋檢測與加固技術(shù)顯得非常必要。 本文針對混凝土小箱梁橋在使用過程中的病害及相應(yīng)處理措施，對檢測與加固方法展開研究，主要研究工作如下： （1）總結(jié)歸納了國內(nèi)外混凝土橋梁檢測與加固技術(shù)研究現(xiàn)狀，指出了對混凝土小箱梁橋進行加固方法研究的必要性和迫切性； （2）深入分析了混凝土橋梁典型病害及其產(chǎn)生原因，介紹了混凝土橋梁的常規(guī)檢測方法和典型病害的處理措施，重點介紹了荷載試驗的目的、內(nèi)容和試驗流程，為混凝土小箱梁橋的加固方法研究奠定基礎(chǔ)； （3）總結(jié)了國內(nèi)外混凝土橋梁常用的加固方法與施工工藝，并對比分析了各自的適用范圍，其中，詳細(xì)論述了粘貼鋼板加固法、粘貼碳纖維加固法和組合加固法的加固原理和施工流程； （4）依托某公路混凝土小箱梁橋工程實例，進行了承載能力檢驗和工作狀態(tài)評估，為該工程加固決策和后期運營管理提供技術(shù)支持；通過粘貼鋼板法、粘貼碳纖維加固法和組合加固法的加固效果、施工難度和經(jīng)濟效益的對比分析研究，得出適合混凝土小箱梁橋加固的最佳技術(shù)方案。
[Abstract]:Highway bridges play an important role in national economy, culture, technology, environment and national defense. Under the combined action of natural environment (such as flood, strong wind, freeze-thaw) and artificial factors (poor engineering quality, overload, etc.), the structural performance of concrete bridges will gradually decline, resulting in insufficient bearing capacity, which will affect the reliability and safety of bridges. How to determine the residual bearing capacity of concrete bridges, evaluate the working state of the structure without damage, and carry out necessary maintenance and reinforcement are the key technical problems to ensure the safe operation of the structure and save economic input. In view of the fact that the number of dangerous bridges in China is increasing year by year and the traffic volume and vehicle load are constantly changing, it is very necessary to enrich and improve the detection and reinforcement technology of concrete beam bridges. Aiming at the disease of concrete small box girder bridge in use and the corresponding treatment measures, the detection and reinforcement methods are studied in this paper. The main research work is as follows: (1) the research status of concrete bridge detection and reinforcement technology at home and abroad is summarized, and the necessity and urgency to study the reinforcement method of concrete small box girder bridge are pointed out. (2) the typical diseases of concrete bridges and their causes are deeply analyzed. The conventional detection methods and treatment measures of typical diseases of concrete bridges are introduced. The purpose, content and test flow of load test are emphatically introduced. It lays a foundation for the study of reinforcement methods of concrete small box girder bridges. (3) summarizes the common reinforcement methods and construction techniques of concrete bridges at home and abroad, and compares and analyzes the respective applicable scope, among which, The reinforcement principle and construction flow of steel plate reinforcement method, carbon fiber reinforced method and composite reinforcement method are discussed in detail. (4) A concrete small box girder bridge project based on a highway is introduced. Carrying capacity inspection and working state evaluation are carried out to provide technical support for the reinforcement decision and later operation management of the project, and the reinforcement effect of the method of bonding steel plate, carbon fiber reinforced and combined reinforcement is obtained. Based on the comparative analysis of construction difficulty and economic benefit, the best technical scheme for strengthening concrete small box girder bridge is obtained.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.72

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本文編號：2257030