基于广义用户均衡的路网脆弱性研究

发布时间：2018-02-14 23:24

本文关键词： 路网脆弱性广义用户均衡重要路评估指标脆弱度评估指标关键路段　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：路网脆弱性研究推动了交通网络理论的发展,利用模型、数据和决策支持工具准确评估并降低路网的脆弱性是非常必要的。同时路网脆弱性评估有助于确定路网关键基础设施,为道路管理部门制定应急措施和预防管理办法提供决策依据,以提升路网整体服务水平和应急防范能力。本文将路网脆弱性定义为路网中网络单元受随机事件扰动影响,失去部分或全部连通能力而导致路网性能下降的性质。首先分析了路网脆弱性影响因素,即包括路网拓扑结构和道路通行能力在内的内部因素和包括自然因素和人为因素等在内的外部因素。其次,考虑出行者有限理性的择路行为和出行需求的波动,引入累积前景理论构建广义用户均衡模型,并以MSA算法求解模型,将其作为路网脆弱性评估中的配流方法。在路网脆弱性评估中考虑状态特性和结构特性两方面性能,从出行时间和广义出行成本出发,构建基于可达性、路网效率、平均前景值和连通路径数量的路段重要度评估指标,以衡量失效路段对路网性能某一方面的影响程度。通过层次分析法确定各路段重要度指标的相对权重来构建路段脆弱度指标,并以该指标排序值为依据来确定路网中的关键路段,同时给出了具体的评估流程。最后利用测试网络进行脆弱性评估,并进行相关参数分析。结果表明出行者的路径选择行为、路网拥挤程度以及需求波动程度对路网脆弱性评估和关键路段的识别具有重要影响。路网脆弱性评估结果在不同的需求水平、需求波动程度以及出行者择路行为假定下会有明显不同。
[Abstract]:The research of road network vulnerability promotes the development of traffic network theory. It is necessary to use models, data and decision support tools to accurately assess and reduce the vulnerability of road network. At the same time, road network vulnerability assessment can help to determine the critical infrastructure of road network. In order to improve the overall service level and emergency prevention ability of road network, the vulnerability of road network is defined as that the network unit is affected by the disturbance of random events, which provides the decision basis for the road management department to formulate emergency measures and preventive management methods. The nature of road network performance degradation due to the loss of some or all connectivity. Firstly, the factors affecting network vulnerability are analyzed. That is, internal factors, including road network topology and road capacity, and external factors, including natural factors and human factors. Secondly, considering the limited rational behavior of travelers and the fluctuation of travel demand, The cumulative foreground theory is introduced to construct the generalized user equilibrium model, and the MSA algorithm is used to solve the model, which is used as a flow allocation method in the vulnerability assessment of road network. The performance of both state and structure characteristics is considered in the assessment of road network vulnerability. Based on the travel time and the generalized travel cost, this paper constructs the evaluation index of the road section importance based on the reachability, the network efficiency, the average foreground value and the number of connected paths. In order to measure the influence degree of the failure section on a certain aspect of road network performance, the relative weight of the importance index of each section is determined by analytic hierarchy process (AHP) to construct the link vulnerability index. According to the ranking value of the index, the key sections of the road network are determined, and the concrete evaluation flow is given. Finally, the vulnerability assessment is carried out by using the test network, and the relevant parameters are analyzed. The results show that the path selection behavior of the traveler is shown. The degree of congestion and the fluctuation of demand play an important role in the assessment of road network vulnerability and the identification of key road sections. The results of road network vulnerability assessment are at different demand levels. The degree of demand volatility and the traveller's alternative behavior are assumed to be significantly different.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U491

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