Horizontal curves are essential elements of road design that allow vehicles to change direction smoothly and safely. However, designing horizontal curves requires careful consideration of factors such as speed, radius, superelevation, and side friction. In this article, we will explain how to use Horizontal Curve Superelevation Calculation Sheetxls, a spreadsheet tool that can help you calculate these parameters easily and accurately.
Horizontal Curve Superelevation Calculation Sheetxls is a spreadsheet tool developed by the Federal Highway Administration (FHWA) that can help you calculate superelevation, tangent runout, and spiral information for horizontal curves based on the 2011 Green Book[^1^]. The spreadsheet allows you to enter the design speed, curve radius, curve length, and other inputs, and it will automatically generate the corresponding outputs such as superelevation rate, transition length, spiral length, and stationing. You can also adjust the inputs and outputs according to your preferences and specifications.
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Horizontal Curve Superelevation Calculation Sheetxls is useful because it can help you design horizontal curves that meet the safety and comfort standards for road users. Superelevation is the amount of cross slope or banking that is applied to a horizontal curve to counteract the centrifugal force that acts on a vehicle. By applying superelevation, you can reduce the lateral acceleration and side friction that a vehicle experiences on a curve, and thus increase the safe operating speed and vehicle stability. However, calculating superelevation can be complex and time-consuming, especially if you have to consider different scenarios and options. Horizontal Curve Superelevation Calculation Sheetxls simplifies this process by providing you with a user-friendly interface and accurate formulas that can save you time and effort.
To use Horizontal Curve Superelevation Calculation Sheetxls, you need to download the spreadsheet from the FHWA website[^1^] and open it with Microsoft Excel or a compatible software. The spreadsheet has two tabs: one for superelevation tables and one for curve data. On the superelevation tables tab, you can select the design speed and curve radius from the drop-down menus, and the spreadsheet will display the corresponding superelevation rate, transition length, spiral length, and stationing. You can also modify the values of the coefficient of side friction, maximum superelevation rate, minimum radius of curvature, and other parameters according to your needs. On the curve data tab, you can enter the curve length, degree of curve, deflection angle, initial stationing, initial bearing, and other inputs for each curve in your road design. The spreadsheet will then calculate the outputs such as superelevation rate, transition length, spiral length, stationing, bearing, etc. for each curve. You can also print or export the results as a PDF file.
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Let's say you want to design a horizontal curve with a design speed of 110 km/h and a radius of 600 m. You can use Horizontal Curve Superelevation Calculation Sheetxls to calculate the superelevation rate and other parameters for this curve. First, you need to download the spreadsheet from the FHWA website[^1^] and open it with Excel. Then, you need to go to the superelevation tables tab and select 110 km/h from the design speed menu and 600 m from the radius menu. The spreadsheet will show you that the superelevation rate for this curve is 6%, the transition length is 90 m, the spiral length is 45 m, and the stationing is 0+000 - 0+180. Next, you need to go to the curve data tab and enter 180 m as the curve length, 9.594° as the degree of curve (calculated by dividing 180 by 600), 17° as the deflection angle (calculated by multiplying 9.594 by 1.8), 0+000 as the initial stationing (assuming this is the first curve in your road design), N30°E as the initial bearing (assuming this is an arbitrary direction), and other inputs as needed. The spreadsheet will 8cf37b1e13