单索面双桁片主梁斜拉桥运营风险评估方法研究
发布时间：2018-10-31 08:20
【摘要】：随着城市交通行业的高速发展，，轨道交通逐渐成为城市交通系统不可分割的一部分，钢桁架主梁斜拉桥逐渐在大跨度公轨两用桥型中受到青睐。城市建设发展对桥梁外形景观要求的新标准，使得严重阻挡城市视野的常规密索体系斜拉桥实用性降低，因此单索面部分斜拉桥形式在增加桥梁结构的通透性方面显得更为合理。这种新桥型在复杂城市交通运营环境中的运营风险问题也日渐被人们所重视。 本文即是在已有的桥梁风险评估理论体系研究的基础上，结合重庆东水门长江大桥的具体特征及其特殊的运营环境，对单索面双桁片主梁斜拉桥运营期的风险评估方法进行研究。主要研究工作如下： ①基于桥梁工程风险评估的基础理论方法、基本工作流程，结合桥梁设计、使用材料、施工工艺、运营状态监测、养护管理等多种因素的影响，建立基于多源信息的单索面公轨两用钢桁梁斜拉桥运营期安全风险评估体系与方法。 ②理清风险源的的主要特征及风险源识别的一般步骤，重点研究了基于事故树的层次分析法的原理和计算方法。通过调查统计国内外桥梁发生的各类风险事故，建立了桥梁风险事故数据库。根据重庆东水门长江大桥的具体运营环境及桥梁特征，利用层次分析法识别出其运营期间的主要风险源。 ③文章对桥梁结构进行了运营期典型风险场景下的易损性和强健性分析，给出了单索面双桁片主梁斜拉桥运营期结构的易损性评价依据及方法，利用有限元计算工具找寻结构的易损部位，结合结构强健性分析的几项指标重点研究了东水门长江大桥在典型风险场景下结构的强健性表现。 ④从运营期桥梁风险概率估测的基本模型入手，分析了风险的基础概率计算方法以及风险事故造成损失的概率计算方法。将风险损失分为结构损伤损失、通行延误损失、人员伤亡损失、环境及社会损失，并对这几类风险损失的估测模型做了相应的研究。 ⑤分析了桥梁结构运营期安全风险接受准则，结合风险矩阵与ALAPR准则制定了运营期桥梁安全风险接受准则，给出了相应的风险事故概率和损失等级评定标准。
[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.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
本文编号：2301498
[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.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
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