中美两国高速公路平面几何设计对比分析

Comparative Analysis on Plan Geometry Design of Expressways in China and USA

通过对高速公路圆曲线半径、超高、缓和曲线等指标的对比分析,介绍中美规范在高速公路平面几何设计时指标选取的区别。分析表明,美国规范对于圆曲线半径取值和我国规范相近,选取的最大超高值比我国略大,缓和段的长度和超高缓和段的设置两国有较大不同。

Through comparative study on the indexes for expressway design,including circular curve radius,superelevation,and transition curve,etc,the differences that the Chinese codes and USA standards showed in choosing indexes for plan geometry design of expressways were described herein.It is indicated that in USA standards,the circular curve radius has similar values as that in Chinese codes,the maximum superelevation is slightly larger than thatin Chinese codes,and that the two countries＇ standards differ from each other significantly in terms of length of transition section and setting of superelevation transition.