公轨两用单索面钢桁梁斜拉桥施工阶段风险评估
发布时间：2018-12-06 08:55
【摘要】：随着我国经济科学技术的快速发展，大跨度斜拉桥陆续出现。跨径在不断刷新纪录，结构造型也越来越新颖，同时对施工技术提出更高的要求，伴随斜拉桥发展而来的是一系列的施工不确定性。对于各种难以预料的风险要给予高度的重视，否则工程建设中一旦发生事故，将带来一系列的损失。因此，构建一套完善的桥梁工程风险评估体制，分析研究桥梁施工期间各种风险行为，从总体上把握风险，进而制定具有针对性的有效措施，以保障工程建设的安全顺利进行，很有必要。 本文以重庆东水门长江大桥的建设为背景，采用定性和定量两种方法对公轨两用单索面钢桁梁斜拉桥结构风险分析理论和方法及对策开展系统和全面的研究分析。首先在研究桥梁工程风险评估的国内外现状的基础上，综述了对桥梁进行风险评估的必要性和意义。通过统计分析桥梁施工期间安全事故，总结出桥梁风险事态类型，利用定性分析方法结合德尔菲法进行风险识别，列出风险源调查表。利用层次分析法结合模糊综合评判法，对各风险因素权值进行计算排序，识别出施工过程中的主要安全风险因素并对风险事态进行模糊综合评价，判断出风险等级水平。其次应用有限元软件Midas/civil对架梁吊机倾覆事故进行风险场景模拟，对桥梁结构在事故中的内力位移变化作仿真分析，分析此项风险事态对结构的影响。最后，对架梁吊机倾覆事故所引起的损失，建立后果估计模型，引入后果当量法对桥梁施工风险损失进行量化估计，对风险进行评价并提出相应的控制措施。 论文对东水门长江大桥的施工风险分析结果与实际情况相符合，可为工程管理者提供重要的决策参考。
[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.
【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;U445
本文编号：2365781
[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.
【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;U445
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