缓和竖曲线的几何特性及设计方法

为满足行车安全、舒适及视距要求，各级公路在变坡点处设置竖曲线。竖曲线形式普遍采用犬半径圆形竖曲线。为更好地提高纵面线形的流畅性，改善行车视距，通过引进国外竖曲线设计方法，分析比较缓和竖曲线与圆形竖曲线的几何挣}生，提出在今后的道路设计中可酌情采用缓和竖曲线。

Geometric Characteristics and Design Method of the Transitioned Vertical Curve

In order to satisfy traffic safety,comfort and sight distance,vertical curves should be set at the knick points of all levels of highways.Sweeping circular curves are used generally at the design of vertical curves.In order to perfect the fluency of vertical alignment,improve sight distance,the paper introduces a new vertical curve-the design method of the transitioned vertical curve.Through analyse and compare the geometric characteristics of the transitioned vertical curve and sweeping circular curve,the paper puts forward transitioned vertical curve could be adopted appropriately in the road design.