【摘要】：隨著我國經(jīng)濟科學技術的快速發(fā)展，大跨度斜拉橋陸續(xù)出現(xiàn)�？鐝皆诓粩嗨⑿录o錄，結構造型也越來越新穎，同時對施工技術提出更高的要求，伴隨斜拉橋發(fā)展而來的是一系列的施工不確定性。對于各種難以預料的風險要給予高度的重視，否則工程建設中一旦發(fā)生事故，將帶來一系列的損失。因此，構建一套完善的橋梁工程風險評估體制，分析研究橋梁施工期間各種風險行為，從總體上把握風險，進而制定具有針對性的有效措施，以保障工程建設的安全順利進行，很有必要。 本文以重慶東水門長江大橋的建設為背景，采用定性和定量兩種方法對公軌兩用單索面鋼桁梁斜拉橋結構風險分析理論和方法及對策開展系統(tǒng)和全面的研究分析。首先在研究橋梁工程風險評估的國內(nèi)外現(xiàn)狀的基礎上，綜述了對橋梁進行風險評估的必要性和意義。通過統(tǒng)計分析橋梁施工期間安全事故，總結出橋梁風險事態(tài)類型，利用定性分析方法結合德爾菲法進行風險識別，列出風險源調(diào)查表。利用層次分析法結合模糊綜合評判法，對各風險因素權值進行計算排序，識別出施工過程中的主要安全風險因素并對風險事態(tài)進行模糊綜合評價，判斷出風險等級水平。其次應用有限元軟件Midas/civil對架梁吊機傾覆事故進行風險場景模擬，對橋梁結構在事故中的內(nèi)力位移變化作仿真分析，分析此項風險事態(tài)對結構的影響。最后，對架梁吊機傾覆事故所引起的損失，建立后果估計模型，引入后果當量法對橋梁施工風險損失進行量化估計，對風險進行評價并提出相應的控制措施。 論文對東水門長江大橋的施工風險分析結果與實際情況相符合，可為工程管理者提供重要的決策參考。
[Abstract]:With the rapid development of economic science and technology, long-span cable-stayed bridges appear one after another. With the development of cable-stayed bridges, a series of construction uncertainties have been brought forward with the continuous breaking of the track record, the structural modeling is becoming more and more novel, and the higher requirements for construction technology are put forward at the same time. A great deal of attention should be paid to all kinds of unpredictable risks, otherwise, a series of losses will be caused in the event of accidents in engineering construction. Therefore, to construct a set of perfect bridge engineering risk assessment system, analyze and study all kinds of risk behaviors during bridge construction, grasp the risk in general, and then formulate effective and targeted measures to ensure the safety and smooth progress of the project construction. It is necessary. Based on the construction of Dongshuimen Yangtze River Bridge in Chongqing, this paper makes a systematic and comprehensive study on the theory, method and countermeasure of structural risk analysis of steel truss girder cable-stayed bridge with common rail and single cable plane by using qualitative and quantitative methods. Firstly, on the basis of studying the present situation of bridge engineering risk assessment at home and abroad, the necessity and significance of bridge risk assessment are summarized. Through statistical analysis of bridge safety accidents during construction, the types of bridge risk situation are summarized, and risk identification is carried out by qualitative analysis method combined with Delphi method, and the risk source questionnaire is listed. By using AHP and fuzzy comprehensive evaluation method, the weights of each risk factor are calculated and sorted, the main safety risk factors in the construction process are identified and the risk situation is evaluated by fuzzy comprehensive evaluation, and the level of risk grade is judged. Secondly, the finite element software Midas/civil is used to simulate the risk scene of the crane overturning accident, and the internal force and displacement of the bridge structure in the accident are simulated and analyzed, and the influence of the risk state on the structure is analyzed. Finally, the damage caused by the overturning accident of girder crane is analyzed, the model of consequence estimation is established, the risk loss of bridge construction is estimated quantitatively by the method of consequence equivalent, the risk is evaluated and the corresponding control measures are put forward. The result of construction risk analysis of Dongshuimen Yangtze River Bridge is consistent with the actual situation, which can provide important decision reference for project manager.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.27;U445

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