Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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Transcribed Image Text:Overall
standard
deviation, S,
Design serviceability loss, APSI
10
5.0
99.9
0.2
99
1.0
0.4
0.5
0.6
90
0.5
0.1
0.05
1.5
2.0
80
70
2.5
60
3.0
50
9 87 65 4
6.5 5.5 4.5 3.5
2
1
Eхample:
2.5
1.5
W18 = 5 x 106
Design structural number, SN
R = 95%
S, = 0.35
M = 5000 Ib/in²
APSI = 1.9
Solution: SN = 5.0
Transcribed Image Text:What are the parameters in designing
flexible pavements? *
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- The following figure shows concrete pavement with the layer thickness and elastic modulus as indicated. Assume modulus of rupture of 650 psi, load transfer coefficient of 3.2, serviceability loss from 4.5 to 2.5, and drainage coefficient of 0.9. The bedrock depth and loss of support is not considered for the subgrade. Use the design equation or monograph with 50% reliability to solve the following: 1) Determine the number of ESAL that the pavement can carry before failure. 2) If the daily traffic has 1080 single axles (20-kip), 400 single axles (24-kip), and 680 tandem axles (40-kip), and the annul traffic is the same over the design period, how many years would the concrete pavement last before failure? 8-inch Portland Cement Concrete Ec=4×106 psi 8-inch Granular Subbase Ec=30,000 psi Subgrade Mr = 5000 psiarrow_forwardAn agency uses the following formula to determine pavement condition rating, PCR = 99.3 5.51 (5.0-ROUGH) 1.59 LNALL 0.221 AVGOUT 0.0306 LONG where we have the following. ROUGH = roughness measured by present serviceability rating (PSR), scale of 0 to 5 LNALL = natural logarithm of alligator cracking, ft per mile AVGOUT = outer wheel path rutting (all locations averaged), 0.01 inch LONG = longitudinal cracking, ft per mile TRAN = transverse cracking, number of cracks per mile And, present serviceability rating is determined as the following. PSR = 5e-0.0051118 IRI-0.0016027 A pavement section has the following distress data. IRI = 106 in./mi Alligator cracking 110 ft/mi Average rutting = 0.20 in. Longitudinal cracks = 130 ft/mi Transverse cracks = 12/mi Determine the current PCR for this section. PCR = 0.531 TRAN, Now, assume a new roughness measurement is expected soon. When PCR falls below 60, the section will be scheduled for rehabilitation. Determine the new IRI value (in in./mi)…arrow_forwardWhat are the common distresses of a flexible pavement and a rigid pavement?arrow_forward
- 1. During the AASHO road test, ONLY flexible pavements were constructed and tested.a. Trueb. False2. The AASHO present serviceability rating (PSR) was considered an objective quantity used to establish the performance of highway pavement in terms of applied traffic.a. Trueb. False3. The AASHTO present serviceability index (PSI) correlates the PSR to actual pavement performance in terms of applied traffic, and select distresses.a. Trueb. False4. There is only one AASHTO PSI equation that applies to both flexible and rigid pavements.a. Trueb. False5. The AASHTO PSI scale ranges from:a. 0-5b. 0-10c. 0-100d. None of the abovearrow_forwardExplain the Superpave grading system of asphalt binder.arrow_forwardRigid pavements distribute loads more efficiently than flexible pavements. True/False Please explain in detailarrow_forward
- Discuss the pros and cons of JPCP versus JRCP. What is meant by the mechanistic-empirical method of pavement design? Is it possible to develop a wholly mechanistic method of pavement design? Why?arrow_forwardDetermine the base thickness of plain concrete pavement (PCP) without dowelled joints using the information and charts provided be • Desired project reliability - 85% Subgrade design CBR-6% • Design period -30 years • Design Traffic 5.0*10* HVAG(B) Note: The information obtained from each table or figure must be stated in the examination script to obtain relevant marks. Table 3.1: Minimum subbase requirements for rigid pavements Design traffic (HVAG) Subbase type 125 mm bound Up to 10⁰ Up to 5x10 150 mm bound or 125 mm LCS Up to 1x10 170 mm bound or 125 mm LCS 150 mm LCS Greater than 1x 10 1 Under CRCP, a heavily bound subbase with an asphalt surfacing is an acceptable alternative 75 Maximum permitted value CBR % Effective subgrade strength used in concrete base thickness determinations 60 50 40 35 30 25 20 15 12 10 Concrete Base 200 Thickness 190 (mm) 180 8. Pavement type 7. 6. 5. PCP Dowelled & CRCP 260 250 240 230 220 210 170 160 150 140 150mm LCS 125mm LCS 8 10 Design subgrade…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_forward
- Explain with sketches, the basis of Austroads mechanistic pavement thickness design method (i.e. what theories and assumptions are these methods based on). What is the major difference between the Austroads mechanistic-empirical (CIRCLY) design method and other mechanistic-empirical design methods?arrow_forwardDefine precisely the difference between pavement serviceability and performance. Using a sketch to indicate the concept of remaining service life of a pavement segment.arrow_forward
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