【作者】 刘超；

【导师】 尹紫红； 阮旭；

【作者基本信息】 西南交通大学 ， 交通运输工程（专业学位）， 2017， 硕士

【摘要】 大跨度桥梁工程一般造价高,施工过程复杂,其安全性能涉及地质、水文、通航、行洪、设计、施工、建设、运营管理等各个方面。安全事故的发生会对社会经济及人民群众的生命安全造成不可估量的后果。因此,开展桥梁工程的安全风险评估极为重要,尤其初步设计阶段,本文以岷江二桥特大桥工程为依托,基于其连续刚构初步设计方案的有关数据,对其进行风险评估并提出了风险控制措施。主要工作有如下几个方面:1.首先针对国内外桥梁工程安全风险评估的现状,指出我国桥梁工程安全风险评估中存在的主要问题。对犍为岷江二桥特大桥安全风险的定义、安全风险识别和安全风险评估等进行阐述,并对安全风险评估方法、分析步骤、评估过程进行分析。2.然后综合定性、定量风险评估及模糊层次分析方法,对犍为岷江二桥特大桥初步设计阶段进行风险评估的分析:从桥梁建设风险、结构方案风险、施工阶段风险及运营阶段风险进行了风险源的辨识;通过对各风险源逐一进行风险因素分析确定主要的风险因素;通过专家打分,结合模糊层次分析法对各风险事件的主要因素进行分析,识别出影响该桥梁初步设计阶段的主要风险事件;最后,基于上述各单一风险事件以及各风险事件中的风险因子,对的总体风险进行评估,得出犍为岷江二桥风险等级为II级。3.最后岷江二桥实际工程中的风险等级,针对相应的风险源分别制定出相应的风险控制措施。4.以犍为岷江二桥特大桥为例,在初步设计阶段安全风险评估中建立了桥梁工程初步设计多层次动态风险评估模型,结合实例总结了评估方法。本文立足于犍为岷江二桥特大桥项目的初步设计阶段,通过对设计阶段、施工阶段、运营阶段开展全面的风险评估研究,建立了桥梁工程初步设计多层次动态风险评估模型,评价了岷江二桥初步设计阶段的安全风险等级,制订了相应的风险控制措施,为岷江二桥工程的顺利进行实施提供了参考依据。更多还原

【Abstract】 The bridge project generally has large span,high cost and complex construction process.The safety performance of the bridge project involves all aspects of geology,hydrology,design,construction,construction and management experience and traffic and navigation.The occurrence of a safety accident can have immeasurable consequences for cesareans and life safety.Therefore,to carry out the safety risk assessment of bridge engineering is extremely important,especially in the initial design stage,this paper relies on the Minjiang River Second Bridge for the project,based on the data of its continuous rigid frame program,its multi-level dynamic risk definition and identification,Conducted a risk assessment of the results and proposed a risk control program.The main work has the following aspects:1.Clarified the status quo of risk assessment of bridge engineering at home and abroad,and pointed out the main problems in the risk assessment of bridge engineering in China.The definition of risk,the concept of risk identification and risk assessment are given for the Second Minjiang Bridge.The methods of risk assessment,analysis steps,assessment process and risk control measures are also described.2.Through the comprehensive qualitative,quantitative risk assessment and fuzzy analytic hierarchy process,the risk assessment of the Second Minjiang Bridge was conducted during the preliminary design stage.First of all,identification of risk sources is carried out from risk of bridge construction,risk of structural solutions,risk of construction phase and operational phase risk.Secondly,risk factors are analyzed one by one to determine the main risk factors;thirdly,Fuzzy analytic hierarchy process to analyze the main factors of each risk event and identify the main risk events that affect the preliminary design stage of the bridge project.Finally,based on the above single risk events and the risk factors in each risk event,the overall risk is evaluated Assessment,derived the Second Minjiang Bridge risk level II.3.According to the risk events in the actual project of the Second Minjiang Bridge,corresponding risk control measures and detailed control measures of major risk sources are formulated for the corresponding risk sources.4.In qianwei the Second Minjiang Bridge extra large bridge as an example,established in the preliminary design stage safety risk assessment bridge project preliminary design dynamic multi-level risk assessment model,combining with examples of evaluation methods are summarized.Based on the preliminary design phase of the Second Minjiang Bridge super large bridge project,this paper establishes a preliminary design multi-level dynamic risk assessment model for the bridge project by conducting a comprehensive risk assessment of the design phase,construction phase and operation phase,Designed the risk level,formulated the corresponding risk control measures,which provided reference for the smooth implementation of the Second Minjiang Bridge project.更多还原