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交通流量分配对道路网络结构可靠度的影响

Keywords: 交通工程,行程时间可靠度,交通流量分配,道路网络可靠度,影响

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Abstract:

研究和分析了基于行程时间可靠度的交通流量分配对道路网络结构可靠度产生的影响,行程时间采用BPR路阻函数,假定行程时间服从Weibull分布,推导出路段行程时间可靠度同路段饱和度之间的关系式。以路段行程时间可靠度80%,即路段饱和度1.0,为衡量和控制标准,对路段超出控制标准部分的交通流量进行重新分配,利用蒙特卡罗MATLAB计算程序计算出分配前后各路段路面结构可靠度,再利用网络串并联原理分别计算出交通流量分配前和分配后的道路网络结构可靠度。通过实例对比分析交通流量分配前后的道路路段可靠度和路网结构可靠度可知以行程时间可靠度为分配标准较以畅通可靠度为分配标准更合理;路段拥堵时的交通流量分配虽可以提高相应路段可靠度,但会降低整个路网结构可靠度。

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