Improvement of Road Network Reliability Based on Critical Links
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摘要: 为简化资源约束下路网可靠性的改进问题,只选择关键路段(即被选择的概率大于预定阀值的路段)进行改进.由于出行者在事件(例如地震、洪水、飓风等)前后的路径选择行为用弹性需求随机用户平衡刻画,路段的选择概率可以基于路段水平有效求得,因而容易确定关键路段.建立了以路网净经济效益相关的可靠性最高为目标,并有资源约束的数学模型.提出了模型的一种启发式算法.算例的结果表明了该方法的有效性.Abstract: To simplify the problem of improving road network reliability with limited resources,only critical links,which are chosen by travelers with higher probabilities than a prescribed threshold,were selected.Because stochastic user equilibrium with elastic demand is used to characterize the travelers’ route choice behaviors before and after incidents (e.g.,earthquakes,floods,hurricanes,etc.),the link choice probabilities can be computed in an efficient link-based manner,and the critical links can be easily determined.A mathematical model was presented,in which the highest reliability corresponding to net economic benefit was taken as the objective for the road network subject to a resource constraint.A heuristic algorithm for the model was designed.The results of a numerical example were presented to show the effectiveness of the proposed method.
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Key words:
- reliability /
- road network /
- net economic benefit /
- stochastic user equilibrium /
- critical link /
- improvement
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