A highway with a design speed of 100 km/hr is designed with a sag curve connecting a descending gradient of 3% with an ascending gradient of 5%. (A) If comfort is the primary design criterion, assuming a vertical radial acceleration of 0.3 m/s^2 calculate the required length of the sag curve (comfort criterion). (B) If a bridge structure were to be located within the sag curve, with a required clearance height of 5.7 m, then assuming a driver’s eye height of 2 m and an object height of 0.26 m, calculate the required length of the sag curve is stopping sight distance is 215m (clearance criterion).
A highway with a design speed of 100 km/hr is designed with a sag curve connecting a descending gradient of 3% with an ascending gradient of 5%. (A) If comfort is the primary design criterion, assuming a vertical radial acceleration of 0.3 m/s^2 calculate the required length of the sag curve (comfort criterion). (B) If a bridge structure were to be located within the sag curve, with a required clearance height of 5.7 m, then assuming a driver’s eye height of 2 m and an object height of 0.26 m, calculate the required length of the sag curve is stopping sight distance is 215m (clearance criterion).
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A highway with a design speed of 100 km/hr is designed with a sag curve connecting a descending gradient of 3% with an ascending gradient of 5%.
(A) If comfort is the primary design criterion, assuming a vertical radial acceleration of 0.3 m/s^2 calculate the required length of the sag curve (comfort criterion).
(B) If a bridge structure were to be located within the sag curve, with a required clearance height of 5.7 m, then assuming a driver’s eye height of 2 m and an object height of 0.26 m, calculate the required length of the sag curve is stopping sight distance is 215m (clearance criterion).
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