A crest vertical curves joining a +3% and -4% grade is to be designed for 90 km/h. If the tangents intersect at station 3+400,00 at an elevation of 76,00 m, determine the stations and elevations of the BVC (beginning of the vertical curve) and EVC (end of the vertical curve). Also calculate the elevations of intermediate points on the curve at the whole stations every 40m.

A crest vertical curves joining a +3% and -4% grade is to be designed for 90 km/h. If the tangents intersect at station 3+400,00 at an elevation of 76,00 m, determine the stations and elevations of the BVC (beginning of the vertical curve) and EVC (end of the vertical curve). Also calculate the elevations of intermediate points on the curve at the whole stations every 40m.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter15: Geometric Design Of Highway Facilities

Section: Chapter Questions

Problem 16P

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Concept explainers

Curve setting

A curve is a turn that is provided horizontally or vertically in the design of highways, railways, and runways. A curve connects two straight lines that are separated by the deflection angle. It helps to change the direction and alignment of the highways, railway tracks, and runways. Therefore, the gradual change in their alignment is made by using a curve to provide comfort to the passengers and this also provides an easy turn to change the direction of the moving vehicle.

Question

A crest vertical curves joining a +3% and -4% grade is to be designed for 90 km/h.
If the tangents intersect at station 3+400,00 at an elevation of 76,00 m, determine the stations and
elevations of the BVC (beginning of the vertical curve) and EVC (end of the vertical curve).
Also calculate the elevations of intermediate points on the curve at the whole stations every 40m.

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Step 1: Given:

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Step 2: Solution:

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Step 3: Compute EVC:

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Step 4: Compute the curve:

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Step 5: Curve table:

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Please explain step 4 and 5

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what about K ? how did you calculate 39 ? when I do my calculations I find 35

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Please give the details of how to calculate the station of BVC and the EVC especialy the L/2. how do you convert the number to terms of stations, what's is the rule ? is there a diference of calculatind it in meter or in feet ?

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