Answered: g vertical curve has a -3% down grade…

g vertical curve has a -3% down grade followed by a +3% upgrade. the design height of the headlight is 2.0 ft from the pavement surface

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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Question

a sag vertical curve has a -3% down grade followed by a +3% upgrade. the design height of the headlight is 2.0 ft from the pavement surface and B=1 degree. If the required SSD is 423 ft what is the length of the curve?

Expert Solution

Step 1

SSd=423ft

h'=2ft

to find length of sag curve

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Step by step solutionProblem 1. An existing equal-tangent sag vertical curve is designed for 60 mph. The initial grade is -3% and the elevation of the PVT is 750 ft. The PVC of the curve is at station 134+00 and the PVI is at 137+00. An overpass is being constructed directly above the PVI. The overpass design assumes the driver’s eye height is 5 ft. Determine: a. the stopping sight distance b. the curve lengthc. the clearance heightd. the mid-curve offset e. the elevation of the PVIf. the elevation of the bottom of the overpass structureg. Is there a linear relationship between curve length and K-value in this problem? Note: No need to show calculations for case (g).
SIGHT DISTANCE 3. A -2.5% grade intersects a 4% grade at sta. 5 + 100 at elev. 50 meters. Compute the stopping sight distance. Design velocity = 75 kph Coefficient of friction between pavement and tires = 0.15
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A sag vertical curve joins a -6% grade and +5% grades. If the PVI of the grades is at Station 355+50 and at an elevation of 156 ft., determine the station and elevation of the PVC, PVT, and the low point for a design speed of 60 mph. Sketch the curve and label the PVI, PVC, PVT and the low point with their stations and elevations. Note: You should check the stopping sight distance criterion and riding comfort design criteria, using the one that controls. 2.
The allowable distance from a roadside obstruction to the centerline of the inside lane of a proposed highway (horizontal curve) is 86.0n The current design plan of the highway horizontal curve has a radius of 695 n. for a level grade, with a design speed of 65 mph. Braking friction coefficient f-0.35, side friction coefficient f-0.11, superelevation rate e6. Please check the design adequacy for the radius of the curve.
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7. What is the psychological widening of a pavement on horizontal curve of radius 230m for ruling speed 80 kmph?
The question about civil (transportation) engineering. This is my homework,please help me
Determine the minimum length of a sag vertical curve if the grades are -3.5% and +3%. Design speed is 60 mi/h. State assumptions used. Consider the following criteria: stopping sight distance, comfort, and general appearance.
PLEASE PROVIDE COMPLETE SOLUTION THANKS
A -2.5% grade intersects a 4% grade at sta. 5 + 100 at elev. 50 meters. Compute the stoppingsight distance.Design velocity = 75 kphCoefficient of friction between pavement and tires = 0.15
A vertical curve is to be constructed between a 2.5% grade and a -3.5% grade. The required sight distance is 305m. The dangerous object is considered to be on the pavement surface, and the driver's eye level is at 1.05m above the pavement surface. Determine the length of the vertical curve that will satisfy the sight distance requirement.