20-13 A six-lane concrete roadway is being designed for a metropolitan area. This roadway vill be constructed on a subgrade with an effective modulus of subgrade reaction k of 70 Ib/in'. The ESAL used for the design period is 2.5 x 10. Using the AASHTO esign method, determine a suitable thickness of the conerete pavement (to the carest inch), provided that the working stress of the concrete to be used is 50 Ib/in and the modulus of elasticity is 5 x 10 Ib/in. Assume the initial service- bility is 4.75 and the terminal serviceability is 2.5. Assume the overall standard devi- tion, S, as 0.35, the load transfer coefficient J as 3.2, the drainage cocfficient, C, as .15, and R as 95%.
20-13 A six-lane concrete roadway is being designed for a metropolitan area. This roadway vill be constructed on a subgrade with an effective modulus of subgrade reaction k of 70 Ib/in'. The ESAL used for the design period is 2.5 x 10. Using the AASHTO esign method, determine a suitable thickness of the conerete pavement (to the carest inch), provided that the working stress of the concrete to be used is 50 Ib/in and the modulus of elasticity is 5 x 10 Ib/in. Assume the initial service- bility is 4.75 and the terminal serviceability is 2.5. Assume the overall standard devi- tion, S, as 0.35, the load transfer coefficient J as 3.2, the drainage cocfficient, C, as .15, and R as 95%.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Pavement thicknen = N.5 in.
Ex 10 I5/in"
k- 200 Ib/in
Radius of loaded arca3 in.
Traffic & Highway Engi..ale +
if the maximum allowable tensile stren in the concrete is 50 5/Am and the cnefficient
210-9
erior of the
1130
Part 5 Materials and Pavements
of friction between the slab and the subgrade is 1.7. Assume uniform drop in temper-
ature. (Note: Weight of concrete is 144 lb/ft'.)
Repeat Problem 20-10, with the slab containing temperature steel in the form of
welded wire mesh consisting of 0.125 in' steel/ft width. The modulus of steel E, is 30 x
10 Ib/in, E, - 5 x 10ʻ Ib/in, and h - 6 in.
A concrete pavement is to be constructed for a four-lane urban expressway on a sub-
grade with an effective modulus of subgrade reaction k of 100 Ib/in, The accumulated
equivalent axie load for the design period is 3.25 x 10, The initial and terminal serv-
icability indices are 4.5 and 2.5, respectively. Using the AASHTO design method,
determine a suitable thickness of the concrete puvement if the working stress of the
concrete is 600 lb/in and the modulus of elasticity is 5 x 10 Ib/in. Take the overall
standard deviation S, as 0.30, the load-transfer coefficient J as 3.2, the drainage
coefficient as 0.9, and R - 95%.
A six-lane concrete roadway is being designed for a metropolitan area. This roadway
vill be constructed on a subgrade with an effective modulus of subgrade reaction k of
70 Ib/in'. The ESAL used for the design period is 2.5 x 10. Using the AASHTO
esign method, determine a suitable thickness of the concrete pavement (to the
carest % inch), provided that the working stress of the concrete to be used is
50 Ib/in? and the modulus of elasticity is 5 x 10 Ib/in?. Assume the initial service-
bility is 4.75 and the terminal serviceability is 2.5. ASsume the overall standard devi-
tion, S, as 0.35, the load transfer coefficient J as 3.2, the drainage coefficient, C, as
.15, and Ras 95%.
An existing rural four-lane highway is to be replaced by a six-lane divided expressway
(three lanes in each direction). Traffic volume data on the highway indicate that the
AADT (both directions) during the first year of operation is 24,000 with the following
vehicle mix and axle loads.
20-11
20-12
20-13
200-14
Passenger cars = 50%
2-axle single-unit trucks (12,000 Iblaxle) - 40%
3-axle single-unit trucks (16,000 lb/axle) = 10%
The vehicle mix is expected to remain the same throughout the design life of 20 years,
although traffic is expected to grow at a rate of 3.5% annually. Using the AASHTO
design procedure, determine the minimum depth of concrete pavement required for
the design period of 20 years.
P, - 4.5
P, = 2.5
S; - 650 Ib/in.
E, = 5 x 10 Ib/in."
k- 130
J= 3.2
C, - 1.0
S = 0.3
R- 95%
Chapter 20 Design of Rigid Pavements
1131
Table 20.19 Data for Problem 20-22
Numher of
Applications
(n)
(2)
Applied Stress
Load
Level
Axle
(3)
(1)
0.02 x 10
IS x 10P
1
300
2
2N)
0.08 x 10
0,1 x 10
0.12 x 10
275
270
260
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