基于Visum的路网容量计算理论研究

道路网容量问题是交通规划中的基本问题之一,大量学者对该问题进行过研究,其中与交通分配结合起来的交通模拟分配法计算路网容量的模型在实际规划中被广泛应用。将运筹学中图论的理论与传统交通分配方法相结合,提出通过建立路网辅助图的方法计算路网容量。在研究方法中,利用交通规划软件PTV的Visum,对北京中关村地区OD实际交通量分配的结果,运用路网辅助图的方法计算出该地区路网的容量。然后,通过改建该地区的路网结构,对新的路网结构进行新OD实际交通量分配,计算新的路网结构中的路网容量。最后对两次路网容量的计算结果进行分析比较,得出改建后路网是否增容的结论。

A Visum-Based Method for Determining Road Network Capacity

Road network capacity is one of the basic transportation planning issues and an interesting research area for many scholars. Among others, traffic assignment simulation model is widely used in transportation planning practices. This paper combines the graph-theory with the traditional traffic assignment methods, utilizing an assistant network diagram to facilitate the calculation of network capacity. A case study is conducted which uses PTV's Visum and OD data collected from Zhongguancun Area, Beijing, to show how the proposed method is applied to traffic assignment on a sub-network covering the Zhongguancun Area.