A -3% grade meets a 7.5% grade at a vertex whose elevation is 146.24 m. directly under an overpass bridge whose underside is at elevation 152. 74 m. and carries another road across the grades at right angles. a. What is the longest symmetrical parabolic curve that can be used to connect the two grades and at the same time provide at least 5 m clearance from the bridge at its centreline? b. If the underside of the bridge is level and is 12 m. wide, Find the actual clearance on the left edge of the bridge.
A -3% grade meets a 7.5% grade at a vertex whose elevation is 146.24 m. directly under an overpass bridge whose underside is at elevation 152. 74 m. and carries another road across the grades at right angles. a. What is the longest symmetrical parabolic curve that can be used to connect the two grades and at the same time provide at least 5 m clearance from the bridge at its centreline? b. If the underside of the bridge is level and is 12 m. wide, Find the actual clearance on the left edge of the bridge.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
8. A -3% grade meets a 7.5% grade at a vertex whose elevation is 146.24 m. directly under
an overpass bridge whose underside is at elevation 152. 74 m. and carries another road
across the grades at right angles.
a. What is the longest symmetrical parabolic curve that can be used to connect the
two grades and at the same time provide at least 5 m clearance from the bridge
at its centreline?
b. If the underside of the bridge is level and is 12 m. wide, Find the actual clearance
on the left edge of the bridge.
with illustration
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