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中文摘要：
以分析轨道交通网络结构为目的,利用可达性对上海3个不同时期的轨道交通网络的通行效率进行了分析.实证分析结果显示,可达性会随着地铁网络规模的增大呈下降趋势.为了阐释出现这种现象的原因,随后对各时期的网络进行结构分析.分析结果显示,3个网络的平均距离和平均最短路径对网络的可达性影响极小,而作为轨道交通网络特有的度分布现象对其影响较大.同时,分别将3个网络与保持度分布不变的随机网络进行了可达性和网络效率的对比,结果表明,轨道交通网络的便利性与网络效率仍有很大的提高空间.
英文摘要：
Accessibility is one of the indicators to measure the efficiency of network. The purpose here is to analyze the rail transit network structure,and the networks of Shanghai subway transportation during three different periods were chosen for accessibility analysis. The empirical analysis results show that the accessibility is declined with the increasing of subway network scale. In order to explain the reasons, the network structure of each period was analyzed. It turns out that the degree distribution of subway transportation networks play a greater role than the average distance and average path length do. Mter comparing with the random networks which have the same degree distribution, there＇ s still a large space which can be improved in the convenience and efficiency of the network.
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