公路平曲线半径可靠性设计理论与方法

将车辆运行速度、路面摩擦因数作为随机变量, 分别构建了基于质点模型与考虑车辆侧倾作用的侧滑失效功能函数, 分析了曲线路段行车安全可靠性。计算了《公路工程技术标准》(JTGB01—2003)中规定的各极限最小半径下发生车辆侧滑的概率, 并通过改变路面摩擦因数和车辆运行速度, 对比研究了2种不同功能函数下的行车失效概率, 提出了公路平曲线半径的可靠性设计流程。研究结果表明: 考虑车辆侧倾作用计算的侧滑概率明显高于由质点模型计算出的侧滑概率; 在同样道路环境下, 卡车发生侧滑的概率会大于轿车; 公路平曲线设计将车辆简化为质点, 忽略侧倾作用以及车型间差异会导致对卡车行驶安全不利。

Reliability design theory and method of highway horizontal curve radius

Vehicle running speed and pavement friction coefficient were considered as random variables. Two performance functions of vehicle skidding failures based on quality point model and considering roll motion were proposed, and the safety reliability of vehicle moving on curve road was analyzed. The skidding probability of each horizontal curve with limiting minimum radius recommended by Technical Standard of Highway Engineering (JTG B01—2003) was calculated, the failure probabilities of two performance functions were compared by varying pavement friction coefficient and vehicle running speed, and the reliability design flow of horizontal curve radius was presented. Analysis result indicates that skidding probability calculated by the performance function considering roll motion is larger than that calculated by quality point model, and truck is more vulnerable to skid than car on the same road environment. Vehicle is simplified as quality point, roll motion and vehicle type difference are ignored in the horizontal curve design, these are adverse to truck safety. 5 tabs, 6 figs, 17 refs.