带型城市空间形态界定及其干线道路特征

特殊的空间形态、稀缺的贯通性轴向道路资源以及高度混合的内外交通导致带型城市面临独特的交通问题。从城市空间形态角度出发,采用聚类分析法分析中国657个设市城市,据此界定带型城市为建成区长宽比大于3的城市。并对带型城市(组团)的交通需求、路网布局、道路级配进行梳理,发现带型城市贯穿性长轴干线道路的数量、等级、分布对带型城市规模、形态以及交通组织具有重要作用,是带型城市路网规划的核心。最后,提出带型城市常用的三轴干线路网布局模式及相应的道路等级,可作为带型城市路网规划的参考依据。

Belt-Shaped Cities:Spatial Forms and Characteristics of the Arterial Roadway System

The unique spatial forms, lack of axial road resources, and highly mixed regional and urban transportation in belt-shaped cities have resulted many transportation problems. Using data from 657 cities across China, this paper identifies the spatial forms of belt-shaped cities based on K-means cluster analysis method. These cities typically have a length-width ratio larger than 3 for urban built-up areas. By analyz-ing travel demand, roadway network layout, and roadway hierarchy in belt-shaped cities, the paper points out that axial-arterial roadways' mileage, hierarchy and layout plays an important role in the scale, spatial forms, and traffic organization of belt-shaped cities. Finally, the paper proposes a three-axial-arterial mode and corresponding roadway classification for belt-shaped cities. The findings can be used for urban trans-portation planning of other belt-shaped cities.