基于未确知测度理论悬浇连续—刚构桥梁施工期的风险评估
发布时间：2019-03-08 08:51
【摘要】：随着中国公路、铁路快速发展,城市化水平持续提高,交通客货运输需求呈持续增长态势,对既有桥梁运营的结构安全提出了挑战,也对新建桥梁的建设提出了更高的要求。受气候、地形、环境等各方面因素影响,公路桥梁建设的技术难度各有差别,且限于当前技术水平,工程上对施工安全影响因素和未知突发情况的认识不够全面,造成了施工风险因素的不确定性,使得桥梁施工安全状况难以把握。因此论文综合考虑影响施工安全的不确定因素,系统分析了在建桥梁的施工风险状况,针对性的提出了相应的风险应对措施,主要成果如下：1、论文以二广高速湖南境内某特大桥为工程依托,在对多种风险评价方法进行综合研究和分析的基础上,引入了未确知测度理论对桥梁施工进行了风险评估,建立了悬臂浇筑连续-刚0构桥梁的施工风险评价系统。2、结合桥梁施工过程中存在的实际风险,对各风险因素进行了定性分析,明确了风险因素的层级结构,确定了其评价指标的取值标准,建立了风险因素指标体系,并依此构建了各评价指标的单指标未确知测度函数。3、利用熵权法计算了专家评分值,确定了单指标未确知测度的权重,得到了多指标未确知综合测度向量。4、通过模糊评价分析法的置信度准则,对综合测度向量进行识别排序,确定了其风险等级,提出了相应的风险应对措施。
[Abstract]:With the rapid development of China's highways and railways, the continuous improvement of urbanization level and the continuous growth of passenger and freight transport demand, it challenges the structural safety of existing bridges and puts forward higher requirements for the construction of new bridges. Affected by climate, topography, environment and other factors, the technical difficulty of highway and bridge construction is different, and is limited to the current technical level, and the engineering understanding of the factors affecting construction safety and unknown emergencies is not comprehensive enough. The uncertainty of construction risk factors makes the safety of bridge construction difficult to grasp. Therefore, considering the uncertain factors that affect the construction safety, the paper systematically analyzes the construction risk situation of the bridge under construction, and puts forward the corresponding risk countermeasures. The main results are as follows: 1, On the basis of comprehensive research and analysis of various risk assessment methods, the paper introduces the theory of unascertained measure to assess the risk of bridge construction, based on the project of a large bridge in Erguang Expressway, Hunan Province, based on the comprehensive research and analysis of a variety of risk assessment methods. The construction risk evaluation system of cantilever continuous-rigid 0-frame bridge is established. 2. Combined with the actual risk existing in the construction process of the bridge, the qualitative analysis of the risk factors is carried out, and the hierarchy structure of the risk factors is defined. The standard of evaluation index is determined, the index system of risk factors is established, and the unascertained measure function of single index for each evaluation index is constructed. 3, the evaluation value of experts is calculated by entropy method, and the evaluation value of experts is calculated by entropy method, and the evaluation value of experts is calculated by entropy method. The weight of single index unascertained measure is determined, and the multi-index unascertained synthesis measure vector is obtained. 4. Through the confidence criterion of fuzzy evaluation analysis method, the synthetic measure vector is identified and sorted, and its risk grade is determined. The corresponding risk countermeasures are put forward.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445
，
本文编号：2436640
[Abstract]:With the rapid development of China's highways and railways, the continuous improvement of urbanization level and the continuous growth of passenger and freight transport demand, it challenges the structural safety of existing bridges and puts forward higher requirements for the construction of new bridges. Affected by climate, topography, environment and other factors, the technical difficulty of highway and bridge construction is different, and is limited to the current technical level, and the engineering understanding of the factors affecting construction safety and unknown emergencies is not comprehensive enough. The uncertainty of construction risk factors makes the safety of bridge construction difficult to grasp. Therefore, considering the uncertain factors that affect the construction safety, the paper systematically analyzes the construction risk situation of the bridge under construction, and puts forward the corresponding risk countermeasures. The main results are as follows: 1, On the basis of comprehensive research and analysis of various risk assessment methods, the paper introduces the theory of unascertained measure to assess the risk of bridge construction, based on the project of a large bridge in Erguang Expressway, Hunan Province, based on the comprehensive research and analysis of a variety of risk assessment methods. The construction risk evaluation system of cantilever continuous-rigid 0-frame bridge is established. 2. Combined with the actual risk existing in the construction process of the bridge, the qualitative analysis of the risk factors is carried out, and the hierarchy structure of the risk factors is defined. The standard of evaluation index is determined, the index system of risk factors is established, and the unascertained measure function of single index for each evaluation index is constructed. 3, the evaluation value of experts is calculated by entropy method, and the evaluation value of experts is calculated by entropy method, and the evaluation value of experts is calculated by entropy method. The weight of single index unascertained measure is determined, and the multi-index unascertained synthesis measure vector is obtained. 4. Through the confidence criterion of fuzzy evaluation analysis method, the synthetic measure vector is identified and sorted, and its risk grade is determined. The corresponding risk countermeasures are put forward.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445
，
本文编号：2436640
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