【摘要】：公路混凝土橋梁使用期間在內外各種因素的相互作用和影響下,可能會產生病害,影響橋梁的正常使用。本論文對混凝土橋梁的病害進行了詳細的調查,將混凝土舊橋的病害分為由環(huán)境作用引起的橋梁病害和由荷載或設計、施工不當引起的橋梁病害。由環(huán)境作用引起的橋梁病害分為混凝土的碳化、氯離子的侵蝕、凍融循環(huán)破壞和鋼筋的銹蝕。由荷載或設計、施工引起的混凝土舊橋病害分為橋梁設計荷載偏低、結構不合理或施工原因引起的病害。針對混凝土橋梁結構出現的各種病害的原因,病害發(fā)生的機理以及對橋梁結構的危害進行了系統(tǒng)總結,在此基礎了給出了各類病害防治的措施。采用我國《公路橋梁養(yǎng)護規(guī)范》給出了基于層次分析的橋梁評估方法,對依托工程進行了現場病害調查和橋梁技術狀況評定,得到了橋梁病害的分布以及橋梁的健康狀況。采用橋梁靜力荷載試驗的方法,對某鋼筋混凝土簡支T梁的承載能力進行了評估。設計了相關試驗方案并進行了現場實施,試驗結果表明,橋梁總體承載能力不滿足設計荷載的要求,據此對該橋進行了加固設計,達到了提載加固的目的。
[Abstract]:Under the interaction and influence of various internal and external factors during the use of highway concrete bridges, diseases may occur, which may affect the normal use of bridges. In this paper, the diseases of concrete bridges are investigated in detail. The diseases of old concrete bridges are divided into two categories: those caused by environmental action and those caused by improper load or design and construction. The bridge diseases caused by environmental action can be divided into concrete carbonation, chloride ion erosion, freeze-thaw cycle failure and steel bar corrosion. According to the load or design, the damage caused by the construction of the old concrete bridge can be divided into the diseases caused by the low design load of the bridge, the unreasonable structure or the construction reason. In this paper, the causes of various diseases in concrete bridge structure, the mechanism of disease occurrence and the damage of bridge structure are summarized systematically. On the basis of this, the measures for prevention and cure of various diseases are given. In this paper, the method of bridge evaluation based on AHP is presented by using the "Highway Bridge maintenance Code" in China. The field disease investigation and bridge technical condition evaluation are carried out on the supporting engineering, and the distribution of bridge diseases and the health status of the bridge are obtained. The bearing capacity of a reinforced concrete simply supported T beam is evaluated by static load test method. The experimental results show that the overall bearing capacity of the bridge does not meet the requirements of the design load. Based on this, the bridge is strengthened and designed to achieve the purpose of lifting and strengthening.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.71

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本文編號：2210866