Example:Design a new flexible pavement for a major interstate highway using thefollowing conditions:Pavement location : RuralNumber of lanes :2 lanes in each directionTotal traffic during peak hour : 267 ESALDesign period : 16 yearsGrowth factor : 12%Traffic distribution design of lane factor Lf: 65%Sub-grade CBR : 8%Standard deviation : 40%Overall serviceability loss: Po - Pt 4.2 -2 = 2.2Solution:Step 1:Reliability (R) = 90% , Rural (Table 8.5)Step 2:Standard deviation (So) = 40% (Given)Step 3:Cumulative expected ESAL during design life in the design lane (W18)W18 = ADT x 365 x G x Df x LfADT = (Total traffic during peak hour) x 24= 267 x 24 = 6408 EASL(1+i)"f-1(1+0.12)16-1G == 45.613i0.1222Df = 0.93 2 lanes each direction (Table 8.6)W18 = 6408 x 365 x 45.613 x 0.93 x 0.65= 64491246 x 64 x 106 ESALD1 = ?D2 = ?D3 = ?

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Example: Design a new flexible pavement for a major interstate highway using the following conditions: Pavement location : Rural Number of lanes :2 lanes in each direction Total traffic during peak hour : 267 ESAL Design period : 16 years Growth factor : 12% Traffic distribution design of lane factor Lf: 65% Sub-grade CBR : 8% Standard deviation : 40% Overall serviceability loss: Po - Pt = 4.2 -2 = 2.2

Example: Design a new flexible pavement for a major interstate highway using the following conditions: Pavement location : Rural Number of lanes :2 lanes in each direction Total traffic during peak hour : 267 ESAL Design period : 16 years Growth factor : 12% Traffic distribution design of lane factor Lf: 65% Sub-grade CBR : 8% Standard deviation : 40% Overall serviceability loss: Po - Pt = 4.2 -2 = 2.2

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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Flexible Pavement Design Assume the thickness of Base Course and Sub Base Course. Compute the SN of Asphalt, Asphalt treated Base, Base course, and Sub base course. Compute the thickness of Asphalt and Asphalt Treated Base.
The traffic on the design lane of a proposed four-lane rural interstate highway consists of 40% trucks. If classification studies have shown that the truck factor can be taken as 0.45, design a suitable flexible pavement using the 1993 AASHTO procedure if the AADT on the design lane during the first year of operation is 1000, pi=4.2 and pt=2.5. Growth rate= 4% Design life= 20 years Reliabilitylevel= 90% Standard deviation= 0.45 The pavement will be exposed to moisture levels approaching saturation 20% of the time, and will take about one week for drainage of water. Effective CBR of the subgrade material is 7. CBR of the base and subbase are 70 and 22, respectively, and Mr for the asphalt mixture, 450kips/in2.
A rural principal arterial is expected to carry an ESAL of 0.188×106 during the first year of operation with an expected annual growth of 6% over the 20-year design life. If the subgrade has resilient modulus of 15,000 psi, design a suitable pavement consisting of a granular subbase with a layer coefficient of 0.13, a granular base layer with a layer coefficient of 0.14, and an asphalt concrete surface with an elastic modulus of 400,000 psi. Assume all m; values = 1 and the percent of traffic on the design lane is 47%. Use reliability level of 99%, standard deviation of 0.4, and APSI of 2.0. If the minimum required thickness of asphalt surface and aggregate base course is used, what is the design thickness of subbase?
Design of Pavement: The thickness of a concrete pavement slab is 20 cm and has modulus of elasticisty and poisson's ratio of 3x105 kg/cm2 and 0.15, respectively. Determine the radius of relative stiffness of the slab if it is resting on a subgrade of 5 kg/cm3 modulus.
3. A concrete pavement is to be constructed for a 4-bne urban expressway on a subgrade with an effective modulus of subgrade reaction k of 100 Ib/in?2 The accumulated equivalent axle load for the design period is 3.25 x 10°. The initial and terminal serviceability indices are 4.5 and 2.5, respectively. Using the AASHTO design method determine a suitable thickness of the concrete pavement, ifthe working stress of the concrete is 600 Iblin2 and the modulus of elasticity is 5 x 106 Iblin?. Take the overall standard deviation, S0 , as 0.30, the load transfer coefficient, J, as 3.2, the drainage coefficient as 0.9, and R=95%. Thickness of the concrete pavement:
The pavement that need to be constructed is a six-lane divided highway. The present AADT (both directions) of 6000 vehicles is expected to grow at 5% per annum. The percent of traffic on the design lane is 45%. Determine the design ESAL if the design life is 20 years and the vehicle mix is: Passenger cars (1000 lb/axle) 60% 2-axle single-unit trucks (5000 lb/axle) = 30% 3-axle single-unit trucks (7000 lb/axle) 10% %3D Dosign the navement (with the design ESAL calculated in auestion 3a)
12. Refer to Figure II-1 attached. A flexible pavement is to be evaluated according to the AASHTO 1972 design guide. The existing pavement has a weighted structural number=3.4, a regional factor=2.0, and a soil support value=4.5. What would be the approximated number of daily equivalent 18-kip axles to be allowed on this road for a 20-year analysis period?a. 10b. 33c. 100d. 1490
section of a two-lane rural highway is to be realigned and replaced by a four-lane highway with a full-depth asphalt pavement. Consists of 40% trucks. If classification studies have shown that the truck factor can be taken as 0.45, design a suitable flexible pavement using the 1993 AASHTO procedure if the AADT on the design lane during the first year of operation is 1000. It is expected that construction will be completed five years from now, and pi =4.5 and pt = 2.5. Growth rate = 4%. Design life = 20 years. The pavement structure will be exposed to moisture levels approaching saturation 20% of the time, and it will take about one week for drainage of water. Effective CBR of the subgrade material is 7. CBR of the base and subbase are 70 (Mr=30000 lb/in2 ) and 22 (Mr=13500 lb/in2 ), respectively, and Mr for the asphalt mixture, 400,000 lb/in2 .
2. You are asked to design a new flexible pavement structure for an existing road that will be totally replaced. You are provided with the following borehole results: a) Existing (Old) HMA - 135 mm b) Existing (Old) Granular A Base - 170 mm c) Existing (Old) Granular B Subbase - 340 mm d) Gravelly Silty Sand (Till) Subgrade (25 % 5-75 um) What is the current GBE for the existing pavement structure? What is the GBE for the same pavement structure when it was newly constructed?
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26. Refer to Figure 8 Design 1A attached. For the design of a 4-lane interstate highway, the damage analysis shown in the figure was performed for a 9.5-inch thick slab according to the PCA design approach. This analysis indicates that the 9.5-inch thick slab: a. Only satisfies the fatigue damage condition b. Only satisfies the erosion damage condition c. Satisfies both fatigue damage and erosion damage conditions. d. None of the above the
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