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道路交通网络脆弱性研究的关键是寻找路网中的脆弱性路段。传统的研究方法将路网中的所有路段作为脆弱性路段备选集合进行遍历搜索,计算量极大,求解效率较低。本文在路网流量分配基础上,通过对路段流量的分析,以路段v/c值为依据提出了构造脆弱性路段备选集合的新方法。该方法通过缩小备选集合规模,可以有效提高脆弱性路段的计算效率。在此基础上,本文从路网运行状态出发,以路网平均出行时间增加率作为评价指标,构建了路网脆弱性评估模型。最后,通过算例分析对所构建的脆弱性评估模型进行演算,结果表明本文所提出的脆弱性路段备选集合的构造方法是合理且有效的。
The key of the research on the vulnerability of road traffic network is to find the vulnerable sections in the road network. The traditional research method traverses all the links in the road network as a candidate set of the vulnerable segments, which requires a large amount of computation and has a low solution efficiency. Based on the traffic distribution of the road network, this paper proposes a new method to construct the candidate set of the fragile road segments based on the v / c value of the road segment by analyzing the traffic volume of the road segment. By reducing the size of alternative set, this method can effectively improve the computational efficiency of the vulnerable sections. On this basis, starting from the road network operating status, this paper takes the average travel time increase rate of the road network as the evaluation index, and builds a road network vulnerability assessment model. Finally, through the example analysis, the proposed vulnerability assessment model is calculated. The results show that the method proposed in this paper is reasonable and effective.