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It estimates the composite of support of any subgrade(s) or subbase(s) layers below the concrete pavement surface course. This web applet allows you to determine the composite k-Value with consideration for up to three subgrade/subbase layers.
How do you calculate the K value for vertical curves? The K value represents the horizontal distance required for a 1% change in grade. To calculate K: K = L / A. Where: L: Length of the vertical curve; A: Algebraic difference between the initial and final grades (|G₁ – G₂|) Example: For a curve with L = 300 feet, G₁ = 2%, and G₂ = -3 ...
Enter the values x, g1, g2, and epvc in the vertical curve elevation calculator to get the elevation of the point of vertical tangency. Use the Calculate button to find the final value in the vertical curve k value calculator.
A 1600-ft-long sag vertical curve (equal tangent) has a PVI at station 200+00 and elevation 1472 ft. The initial grade is –3.5% and the final grade is +6.5%. Determine the elevation and stationing of the low point, PVC, and PVT. Vertical Curve Through a Point Illustration Solution steps Use Equation 3.1 Determine parameters a, b, and c
The modulus of subgrade reaction (k) is used as a primary input for rigid pavement design. It estimates the support of the layers below a rigid pavement surface course (the PCC slab). The k-value can be determined by field tests or by correlation with other tests.
To calculate the K value for a vertical curve, you can use the following formula: K = (L^2)/ (24R) Where: – K = K value in feet. – L = Horizontal distance between the beginning and end of the vertical curve. – R = Algebraic difference in grades between the tangent lines at each end of the vertical curve.
23 maj 2024 · The K value is used to calculate the minimum radius of curvature for horizontal curves in a roadway, ensuring that drivers can navigate the road safely and comfortably. The process of calculating the K value involves several variables that must be taken into consideration, including the design speed, desired friction factor, and sight distance ...
