桥梁曲面实体建模几何对象模型

Topological structure and geometrical objects of bridge solid modelLIU Hanbing, WANG Lei, WANG Yanhua

在分析实体模型技术在桥梁设计领域的应用现状和存在问题的基础上。针对目前的几何造型系统中一般只提供了直线和圆曲线(而曲线桥梁具有缓和曲线偏置线和抛物线)的情况,推导出了缓和曲线偏置线的参数方程,并提出了几何对象模型。通过建立松花江大桥模型,验证了提出的几何对象模型的正确性。

The present applied condition and problems of solid model technique in the field of bridge design was analyzed. Aiming at the characteristic that current geometric modeling systems only provide line and arc but curve bridges have parabolas and offset lines of transition the parameter equations of transition curves' offset lines was deduced and the model of geometrical object was put forward. It is proved that the model which has been set up for Song-Hua-Jiang Bridge using the method presented in this paper is correct.