Principles of Highway Engineering and Traffic Analysi (NEW!!)
6th Edition
ISBN: 9781119305026
Author: Fred L. Mannering, Scott S. Washburn
Publisher: WILEY
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Chapter 4, Problem 14P
To determine
The assumed soil resilient modulus.
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A rigid pavement is designed with a 11-inch slab, an E_c of 6 million Ib/in^2, a concrete modulus of rupture of 432 Ib/in^2, a
load transfer coefficient of 3.0, an initial PSI of 4.50, and a TSI of 2.5. The overall standard deviation is 0.56, the modulus of
subgrade reaction is 190 Ib/in^3, and a reliability of 90% is used along with a drainage coefficient of 0.87. The pavement is
designed assuming that traffic is composed entirely of trucks (50 per day). Each truck has one 20-kip single axle and one
42-kip tandem axle (the effect of all other vehicles is ignored). A section of this road is to be replaced (due to different
subgrade characteristics) with a flexible pavement having a SN of 5 and is expected to last the same number of years as
the rigid pavement. What is the assumed soil resilient modulus? (Assume that all other factors are the same as for the rigid
pavement). Please report your answer as a decimal in units of Ib/in^2. For example, report 3000.6 Ib/in^2 as 3000.6.
Question 3: A rigid pavement is designed with an 11-inch slab thickness, 95%
reliability, E, 4,000,000 lb/in', modulus of rupture of 650 lb/in', modulus of
subgrade reaction of 200 lb/in', a 3.2 load transfer coefficient, initial PSI of 4.7,
final PSI of 2.5 (A PSI = 2.2), overall standard deviation of 0.40, and a drainage
coefficient of 1.0. The pavement has 20 years design life. The pavement has three
lanes, with PDL = 0.6 for trucks that have three axles: one 25,000 single axle, one
32,000 lb tandem axle and one 50,000 lb triple axle. What is the daily estimated
truck traffic on the three lanes? Solve using AASHTO design Nomographs.
A rigid pavement is to be designed for a wheel load of 53.5 kN. If the
tensile strength of concrete is taken as 1.38, determine the required
thickness assuming sufficient dowels and tie bars are provided.
Chapter 4 Solutions
Principles of Highway Engineering and Traffic Analysi (NEW!!)
Ch. 4 - Prob. 1PCh. 4 - Prob. 2PCh. 4 - Prob. 3PCh. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10P
Ch. 4 - Prob. 11PCh. 4 - Prob. 12PCh. 4 - Prob. 13PCh. 4 - Prob. 14PCh. 4 - Prob. 15PCh. 4 - Prob. 16PCh. 4 - Prob. 17PCh. 4 - Prob. 18PCh. 4 - Prob. 19PCh. 4 - Prob. 20PCh. 4 - Prob. 21PCh. 4 - Prob. 22PCh. 4 - Prob. 23PCh. 4 - Prob. 24PCh. 4 - Prob. 25PCh. 4 - Prob. 26PCh. 4 - Prob. 27PCh. 4 - Prob. 28PCh. 4 - Prob. 29PCh. 4 - Prob. 30PCh. 4 - Prob. 31PCh. 4 - Prob. 32P
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- 4.13) A rigid pavement is being designed with the same parameters as used in Problem 4.5. The modulus of subgrade reaction is 300 1b/in? and the slab thickness is determined to be 8.5 inches. The load transfer coefficient is 3.0, the drainage coefficient is 1.0, and the modulus of elasticity is 4 million Ib/in?. What is the design modulus of rupture? (Assume that any parameters not given in this problem are the same as those given in Problem 4.5.) 4.5 has been added for reference.arrow_forwardA rigid pavement is designed with an 11-inch slab thickness, 90% Rellability (ZR = -1.282), Es = 4 million psi, modulus of rupture of 600 psi, modulus of subgrade reaction of 150 lb/in?, a 2.8 load transfer coefficient, initial PSI = 4.8, final PSI of 2.5, overall standard deviation of 0.35, and a drainage coefficient of 0.80. The pavement has a 20-year design life. The pavement has three lanes in one direction (PDL = 0.80) and is conservatively designed for trucks that have one 20,000-lb single axle load (1.58), one 26,000-lb tandem axle (0.619), and one 34,000-b triple axle (0.593). What is the daily estimated truck traffic on the three lanes? logia (APSI) S,C¢(D@7% – 1.132) 3.0 [1.62410x10 |(D + 1)*46 | log10 (W) = Zg5, + 7.35 (log,0( D + 1)) – 0.06 +: +(4.22 - 0.327SI) log10 1+ 18.42 215.63/ De75 - 0.25arrow_forwardShow complete solution and clear explanation thank you A flexible pavement having a thickness of 46mm carries a static wheel load of W. The circular contact has an equivalent radius of 150mm. If the load W is assumed to be transmitted across a wide are of subgrade at an angle of 45 degrees compute the value of the wheel load W if the bearing stress of the base is 0.42 MPaarrow_forward
- A rigid pavement is to be used to carry a wheel load of 53.5 kN. Design the thickness at the edge and at the center of the pavement. The allowable tensile stress of concrete is 1.38 MPa. Sufficient dowels are used across the joints.arrow_forwardQ6: Designing a Rigid Pavement Using the AASHTO Method (Find D) Effective modulus of subgrade reaction, k = 480 lb/in³ Mean concrete modulus of rupture, Sc = 725 lb/in² Load transfer coefficient, J = 3.9 Ec = 4500000 Drainage coefficient, Ca = 1.0 Design serviceability loss, APSI = 1.5 ZR (Standard normal deviation) = -1.282 Overall standard deviation, So = 0.4 Cumulative 18 kip ESAL = (37900000)arrow_forwardA six-lane concrete roadway is being designed for a metropolitan area. This roadway will be constructed on a subgrade with an effective modulus of subgrade reactionk of 170 Ib/in^3. The ESAL used for the design period is 6.9* 10^6. Using the AASHTO design method, determine a suitable thickness of the concrete pavement (to the nearest 12 inch). provided that the working stress of the concrete to be used is 650 lb/in2 and the modulus of elasticity is 5 *10^6 Ib/in^2. Assume the initial serviceability is 4.75 and the terminal serviceability is 2,5. Assume the overall standard deviation, So, as 0.35, the load transfer coefficient J as 3.2. the drainage coefficient. Cd as 1.15. and R as 95%. Answer:arrow_forward
- Determine the thickness of a rigid pavement with a wheel load capacity of 54 kN, if the allowable tensile stress of the concrete is 1.6 MPa. Neglect the effect of dowels.arrow_forwardB. A rigid pavement with a 10-inch slab thickness, 90 percent reliability, E. = 4 million lb/in², 600 lb/in² modulus of rupture, 150 lb/in³ modulus of subgrade reaction, a 2.8 load transfer coefficient, initial PSI of 4.8, final PSI of 2.5, overall standard deviation of 0.35, and a drainage coefficient of 0.8 is designed. The pavement's design life is 20 years. The three-lane road is built for vehicles with one 20,000-pound single axle, one 26,000-pound tandem axle, and one 34,000-pound triple axle. Calculate the projected daily truck traffic on the three lanes.arrow_forwardA rigid pavement 160-mm thick and 8.10-m wide is to be provided with a center longitudinal joint using 12.0-mm reinforcing steelbar. The concrete’s unit weight is 24kN/m3 with slab’s coefficient of friction on the grade is with the assumption that the allowable working stress intension for the steelbars is 138MPA, determine the spacing of the longitudinal bars in mm.arrow_forward
- An undowelled rigid pavement in a subdivision roadway has thickness equivalent to 300mm. What should be the allowable tensile strength of concrete in MPa in order to support a wheel load equivalent to 9kN?arrow_forwardA flexible pavement having a thickness of 46 mm carries a static wheel load of "W". The circular contact are of time has an equivalent radius of 150 mm. If the load "W" is assumed to be transmitted across a wide area of subgrade at an angle of 45°, compute the value of wheel load "W" if the bearing stress of the base is 0.42 MPa.arrow_forwardGiven ESAL = 5 x 10 6, Pe = 2.5%, PP = 0.02%, PSI = 1 .7, and MR = 5000 psi, deter -mine the structural number SN of the mainline and shoulder pavement required for a reliabilityof 50% .arrow_forward
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