【摘要】：隨著我國(guó)經(jīng)濟(jì)科學(xué)技術(shù)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(jì)錄，結(jié)構(gòu)造型也越來越新穎，同時(shí)對(duì)施工技術(shù)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(duì)于各種難以預(yù)料的風(fēng)險(xiǎn)要給予高度的重視，否則工程建設(shè)中一旦發(fā)生事故，將帶來一系列的損失。因此，構(gòu)建一套完善的橋梁工程風(fēng)險(xiǎn)評(píng)估體制，分析研究橋梁施工期間各種風(fēng)險(xiǎn)行為，從總體上把握風(fēng)險(xiǎn)，進(jìn)而制定具有針對(duì)性的有效措施，以保障工程建設(shè)的安全順利進(jìn)行，很有必要。 本文以重慶東水門長(zhǎng)江大橋的建設(shè)為背景，采用定性和定量?jī)煞N方法對(duì)公軌兩用單索面鋼桁梁斜拉橋結(jié)構(gòu)風(fēng)險(xiǎn)分析理論和方法及對(duì)策開展系統(tǒng)和全面的研究分析。首先在研究橋梁工程風(fēng)險(xiǎn)評(píng)估的國(guó)內(nèi)外現(xiàn)狀的基礎(chǔ)上，綜述了對(duì)橋梁進(jìn)行風(fēng)險(xiǎn)評(píng)估的必要性和意義。通過統(tǒng)計(jì)分析橋梁施工期間安全事故，總結(jié)出橋梁風(fēng)險(xiǎn)事態(tài)類型，利用定性分析方法結(jié)合德爾菲法進(jìn)行風(fēng)險(xiǎn)識(shí)別，列出風(fēng)險(xiǎn)源調(diào)查表。利用層次分析法結(jié)合模糊綜合評(píng)判法，對(duì)各風(fēng)險(xiǎn)因素權(quán)值進(jìn)行計(jì)算排序，識(shí)別出施工過程中的主要安全風(fēng)險(xiǎn)因素并對(duì)風(fēng)險(xiǎn)事態(tài)進(jìn)行模糊綜合評(píng)價(jià)，判斷出風(fēng)險(xiǎn)等級(jí)水平。其次應(yīng)用有限元軟件Midas/civil對(duì)架梁吊機(jī)傾覆事故進(jìn)行風(fēng)險(xiǎn)場(chǎng)景模擬，對(duì)橋梁結(jié)構(gòu)在事故中的內(nèi)力位移變化作仿真分析，分析此項(xiàng)風(fēng)險(xiǎn)事態(tài)對(duì)結(jié)構(gòu)的影響。最后，對(duì)架梁吊機(jī)傾覆事故所引起的損失，建立后果估計(jì)模型，引入后果當(dāng)量法對(duì)橋梁施工風(fēng)險(xiǎn)損失進(jìn)行量化估計(jì)，對(duì)風(fēng)險(xiǎn)進(jìn)行評(píng)價(jià)并提出相應(yīng)的控制措施。 論文對(duì)東水門長(zhǎng)江大橋的施工風(fēng)險(xiǎn)分析結(jié)果與實(shí)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(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.27;U445

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