中美规范下缓和曲线最小长度对比分析

Comparative Analysis on the Minimum Length of Transition Curve Based on Chinese Standards and USA Codes

通过分析高速公路缓和曲线最小长度取值的影响因素,对比中、美两国规范在高速公路平面设计时缓和曲线最小长度指标选取的差异,并介绍存在差异的原因。经分析认为,中、美规范中超高缓和段的设置有较大区别,相同条件下美国规范缓和曲线最小长度取值比我国略小。

By analyzing the influencing factors on the minimum length of expressway transition curve,the differences between the selection of the minimum length index of expressway transition curve in geometric design are compared based on Chinese standards and USA codes,and the reasons for the differences are introduced.The analysis reveals that the setting of superelevation transition in USA codes differs from Chinese standards and the minimum length of the transition curve in USA codes is slightly smaller than that of Chinese standards.