Answered: ical curve is going to be designed to…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A vertical curve is going to be designed to join a 0% grade with a +5% grade at a section of a highway. The station and elevation of the PVC point are 5+00 and 12 ft, respectively. Assuming AASHTO design standard values for perception-reaction time, deceleration rate for braking, and driver’s eye and object heights, determine the following: 1. The min length of the curve if the design speed is 65 mi/h. 2. The station and elevation of the PVT. 3. The station and elevation of the high or low point. 4. The elevation of the point at station 6+50.

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$a s g_{1} < g_{2} c u r v e i s s a g c u r v e S S D = v t + \frac{v^{2}}{2 g (\frac{a}{g} - G)} v = 65 m p h = 95.3333 \frac{f t}{s} s o, S S D = (95.33) (2.5) + \frac{95 . 33^{2}}{2 (32.2) (\frac{11.2}{32.2} - 0)} S S D = 644.03 f t$

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