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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 road design codes in other countries and regions, the minimum circular curve radius without the easing curve appears too large in our country road design code. On the one hand, due to inconsistencies in the calculation models adopted, the main one is our country’s norms adopted a more conservative attitude. In order to verify whether it is reasonable for our country to adopt a larger numerical value and to consider the uncertainty of the linear design index of the road, based on the reliability theory, the functional function under the limit state of the design index is established. The first order second moment method and Monte Carlo method are used to solve the problem. index. The value of no minimum radius of the easement curve is analyzed by a reliable index and compared with the values in the current road code. The results show that the radius of the smallest circular curve with no mitigation curve in China’s highway and urban road design specifications is too large.