【摘要】：隨著城市交通行業(yè)的高速發(fā)展，，軌道交通逐漸成為城市交通系統(tǒng)不可分割的一部分，鋼桁架主梁斜拉橋逐漸在大跨度公軌兩用橋型中受到青睞。城市建設發(fā)展對橋梁外形景觀要求的新標準，使得嚴重阻擋城市視野的常規(guī)密索體系斜拉橋實用性降低，因此單索面部分斜拉橋形式在增加橋梁結構的通透性方面顯得更為合理。這種新橋型在復雜城市交通運營環(huán)境中的運營風險問題也日漸被人們所重視。 本文即是在已有的橋梁風險評估理論體系研究的基礎上，結合重慶東水門長江大橋的具體特征及其特殊的運營環(huán)境，對單索面雙桁片主梁斜拉橋運營期的風險評估方法進行研究。主要研究工作如下： ①基于橋梁工程風險評估的基礎理論方法、基本工作流程，結合橋梁設計、使用材料、施工工藝、運營狀態(tài)監(jiān)測、養(yǎng)護管理等多種因素的影響，建立基于多源信息的單索面公軌兩用鋼桁梁斜拉橋運營期安全風險評估體系與方法。 ②理清風險源的的主要特征及風險源識別的一般步驟，重點研究了基于事故樹的層次分析法的原理和計算方法。通過調查統(tǒng)計國內外橋梁發(fā)生的各類風險事故，建立了橋梁風險事故數(shù)據(jù)庫。根據(jù)重慶東水門長江大橋的具體運營環(huán)境及橋梁特征，利用層次分析法識別出其運營期間的主要風險源。 ③文章對橋梁結構進行了運營期典型風險場景下的易損性和強健性分析，給出了單索面雙桁片主梁斜拉橋運營期結構的易損性評價依據(jù)及方法，利用有限元計算工具找尋結構的易損部位，結合結構強健性分析的幾項指標重點研究了東水門長江大橋在典型風險場景下結構的強健性表現(xiàn)。 ④從運營期橋梁風險概率估測的基本模型入手，分析了風險的基礎概率計算方法以及風險事故造成損失的概率計算方法。將風險損失分為結構損傷損失、通行延誤損失、人員傷亡損失、環(huán)境及社會損失，并對這幾類風險損失的估測模型做了相應的研究。 ⑤分析了橋梁結構運營期安全風險接受準則，結合風險矩陣與ALAPR準則制定了運營期橋梁安全風險接受準則，給出了相應的風險事故概率和損失等級評定標準。
[Abstract]:With the rapid development of urban transportation industry, rail transit has gradually become an integral part of urban transportation system, and steel truss girder cable-stayed bridge is gradually favored in the large-span common-rail bridge type. The development of urban construction requires the new standard of bridge landscape, which reduces the practicability of conventional cable system cable-stayed bridge, which seriously blocks the city view. Therefore, partial cable-stayed bridge with single cable plane is more reasonable in increasing the permeability of bridge structure. The operation risk of this new bridge in complex urban traffic environment has been paid more and more attention. This paper is based on the existing theoretical system of bridge risk assessment, combined with the specific characteristics of Chongqing Dongshuimen Yangtze River Bridge and its special operating environment. The risk assessment method of single cable plane double truss girder cable-stayed bridge is studied. The main research work is as follows: 1 based on the basic theory and method of bridge engineering risk assessment, basic work flow, combined with bridge design, using materials, construction technology, operation condition monitoring, maintenance management and other factors, The safety risk assessment system and method of steel truss girder cable-stayed bridge with single cable plane and common rail are established based on multi-source information. (2) the main characteristics of the risk source and the general steps of identifying the risk source are clarified, and the principle and calculation method of the AHP based on the accident tree are studied emphatically. Through the investigation and statistics of all kinds of bridge accidents at home and abroad, the database of bridge risk accidents is established. According to the specific operating environment and bridge characteristics of Dongshuimen Yangtze River Bridge in Chongqing, the main risk sources during the operation period are identified by using the Analytic hierarchy process (AHP). In this paper, the vulnerability and robustness of bridge structure under typical risk scenarios during operation period are analyzed, and the basis and method for evaluating the vulnerability of cable-stayed bridge with single cable plane and double truss plate are given. The finite element method is used to find the vulnerable parts of the structure, and the structural robustness of the Dongshuimen Yangtze River Bridge under typical risk scenarios is studied in combination with several indexes of structural robustness analysis. 4 starting with the basic model of bridge risk probability estimation in operation period, the basic probability calculation method of risk and the probability calculation method of loss caused by risk accident are analyzed. The risk loss is divided into structural damage loss, traffic delay loss, casualty loss, environmental and social loss, and the estimation models of these kinds of risk losses are studied. (5) the safety risk acceptance criterion of bridge structure during operation period is analyzed, the risk acceptance criterion of bridge safety risk is established by combining the risk matrix with ALAPR criterion, and the corresponding risk accident probability and loss grade evaluation criteria are given.
【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

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