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1.平曲线超高怎样计算(1204)? 计算曲线超高横坡度的公式与计算平曲线半径的公式一样,只是形式变化一下,即: i=V~2/(127R)—Φ_2………………(1) 式中:i—超高横坡度; V—行车速率(公里/小时); R—曲线半径(公尺); Φ_2—车轮与路面间的横向摩擦系数。从公式(1)可以看出,超高横坡度值与曲线半径值成反比,当曲线半径小于设计准则表2—2中的数值时,需要设置超高。在设计准则里,超高横坡度值的范围规定为2～6％;在表2—4中规定了各级路的最大超高横坡度。如果引用各级路的最小半径和设计行车速率,按公式(1)计算各级路的最大超高横坡度,所算出的结果将比规定数值大的多。
1. What is the calculation of the super-high curve (1204)? The formula for calculating the super-high grade of the curve is the same as the formula for calculating the radius of the flat curve except that it changes in form: i = V 2 / (127R) -Φ_2 ......... (1) Where: i-superhigh grade; V-traffic speed (km / h); R-curve radius (meters); Φ_2-lateral friction coefficient between wheel and road surface. As can be seen from the formula (1), the value of super-high-grade slope is inversely proportional to the radius of the curve. When the radius of the curve is smaller than the value in Table 2-2 of the design guideline, the super-height needs to be set. In the design guidelines, the range of super-high grade grade values is specified as 2 to 6%; in Table 2-4, the maximum super-grade grade grade for each grade is specified. If you refer to the minimum radius of the road and the design of the traffic rate, according to formula (1) to calculate the maximum height of the road at all levels, the calculated results will be much larger than the specified value.