基于可靠度的道路不设缓和曲线最小半径的计算  

Calculation of Minimum Circular Radius of Road without Transition Curve Based on Reliability

作　　者：杨晨[1,2] 程建川[1,2] 

机构地区：[1]东南大学交通学院,江苏南京210096 [2]江苏省现代道路交通安全设计与评价联合培养研究生示范基地,江苏南京210005

出　　处：《公路交通科技》2013年第7期7-11,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51078088)

摘　　要：与其他国家和地区的道路设计规范相比,在我国道路设计规范中,不设缓和曲线的最小圆曲线半径数值显得过于偏大。一方面是由于采用的计算模型不一致,但主要的还是我国的规范采取了更为保守的态度。为了验证我国规范采用较大数值是否合理,考虑道路线形设计指标的不确定性,以可靠度理论为基础,建立设计指标极限状态下功能函数,利用一次二阶矩法和蒙特卡罗法求解可靠指标。通过可靠指标来分析不设缓和曲线最小半径的取值,并与目前道路规范中的取值进行比较。研究结果表明:我国公路和城市道路设计规范中的不设缓和曲线的最小圆曲线半径取值过大。Compared with the roadway design specifications of some countries and regions, the minimum circular radii without transition curve are larger in Chinese specifications. On one hand, the computational model is inconsistent, but the most important factor is that the Chinese specifications adopt a more conservative concept. In order to verify the reasonability of using a larger value in Chinese specification, with consideration of the uncertainty of roadway alignment design parameters, the performance function of the design parameters at limit state is developed based on reliability theory to solve the reliability index by means of first order second moment method and Monte Carlo method. The reliability index is applied to analyze the value of the minimum radius of circular curve without transition curve, and the value is compared with those in the current specifications. The results show that the minimum radius of circular curve without transition curve in Chinese design specification for highway and urban road should be smaller.

关 键 词：道路工程 道路设计可靠度 可靠度理论 最小圆曲线半径 缓和曲线 

分 类 号：U412[交通运输工程—道路与铁道工程]