道路平面线形设计对象模型

Design Object Model of Road Plane Alignment

以计算几何、微分几何、数据结构理论为基础，运用面向对象技术思想，探寻了道路平面线形设计的特点，分析了现有国内道路软件平面设计对象模型的局限性，提出了道路线形平面设计对象模型.本模型首先建立道路中心线设计对象模型，然后以此为依托，利用平面法向曲线原理，运用层次分析法，建立了中央分隔带模型、边线模型、机非分隔带模型、交通岛模型、雨水口模型等.本模型的建模思想不仅适合于道路平面设计，今后还可应用于道路纵断面设计、横断面设计、管线综合等.

This paper, based on computing geometry, differential geometry and data structure theory, researches into the characteristics of road plane alignment design and the limitation of existing design object model in road CAD systems.Moreover, it presents a design object model of road plane alignment with object- oriented programming technique. This model 'system firstly builds design object model of road centreline. On the basis of it, the author uses plane normal curve theory and hierachy analysis theory to establish centrestrip model, edgeline model, teardrop model and rainwell model, etc. The method of this model suits not only road plane design, but also road profile design, crossing design, pipeline design, etc.