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A proposed four-lane divided highway is to be constructed using asphalt concrete surface layer. Table below shows the EwexRat traffic data collected from DPWH regional office along the proposed alignment. Vehicle Code В, В1, В2 12-2 12-3 Load per axle, Ibs 2,000 10,000 14,000 6,000 Number of Description AADT axles 2 5 Light Vehicles (sedan, SUV, pickup) Semi-trailer trucks Truck semi-trailer Public buses, single-unit trucks 75,000 4,000 1,500 15,700 D-4 2 Forecasted annual traffic growth Percentage of traffic on design lane Design service life of pavement - 4.Y% 32% - 20 years Moreover, the regional ffice plans to adapt a flexible pavement with the following specifications listed below. Resilient modulus of asphalt concrete Resilient modulus of base course Resilient modulus of subbase course California Bearing Ratio (CBR) of base course material 420 ksi 28.5 ksi 15 ksi = 70 - 30 - 6 California Bearing Ratio (CBR) of subgrade material Reliability of the pavement design Standard deviation in traffic forecast and pavement performance Initial serviceability index Terminal serviceability index 95% - 0.45 - 4.0 2.5 It is expected that the structure will only take a day for the surface runoff to be drained from within the pavement, and the pavement structure will be exposed to moisture levels approaching saturation 50% of the time. Acceptability criterion: To check if the initially assumed value of structural number SN is acceptable, use the formula: SNaumed - SN| x 100 SNsumed If o s 30%, accepted; otherwise, reiterate the procedure. Questions: Calculate the Design Equivalent Single-Axle Load (ESAL) to be used for the design of the flexible pavement.

A proposed four-lane divided highway is to be constructed using asphalt concrete surface layer. Table below shows the EwexRat traffic data collected from DPWH regional office along the proposed alignment. Vehicle Code В, В1, В2 12-2 12-3 Load per axle, Ibs 2,000 10,000 14,000 6,000 Number of Description AADT axles 2 5 Light Vehicles (sedan, SUV, pickup) Semi-trailer trucks Truck semi-trailer Public buses, single-unit trucks 75,000 4,000 1,500 15,700 D-4 2 Forecasted annual traffic growth Percentage of traffic on design lane Design service life of pavement - 4.Y% 32% - 20 years Moreover, the regional ffice plans to adapt a flexible pavement with the following specifications listed below. Resilient modulus of asphalt concrete Resilient modulus of base course Resilient modulus of subbase course California Bearing Ratio (CBR) of base course material 420 ksi 28.5 ksi 15 ksi = 70 - 30 - 6 California Bearing Ratio (CBR) of subgrade material Reliability of the pavement design Standard deviation in traffic forecast and pavement performance Initial serviceability index Terminal serviceability index 95% - 0.45 - 4.0 2.5 It is expected that the structure will only take a day for the surface runoff to be drained from within the pavement, and the pavement structure will be exposed to moisture levels approaching saturation 50% of the time. Acceptability criterion: To check if the initially assumed value of structural number SN is acceptable, use the formula: SNaumed - SN| x 100 SNsumed If o s 30%, accepted; otherwise, reiterate the procedure. Questions: Calculate the Design Equivalent Single-Axle Load (ESAL) to be used for the design of the flexible pavement.

Structural Analysis
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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Situation: A proposed four-lane divided highway is to be constructed using asphalt concrete surface layer. Table below shows the fvevRAr traffic data collected from DPWH regional office along the proposed alignment. Load per axle, Ibs 2,000 10,000 14,000 6,000 Vehicle Number of Description AADT Code axles В, В1, В2 12-2 12-3 Light Vehicles (sedan, SUV, pickup) Semi-trailer trucks Truck semi-trailer Public buses, single-unit trucks 75,000 4,000 1,500 15,700 5 D-4 2 Forecasted annual traffic growth Percentage of traffic on design lane Design service life of pavement = 4.Y% = 32% = 20 years Moreover, the regional office plans to adapt a flexible pavement with the following specifications listed below. Resilient modulus of asphalt concrete Resilient modulus of base course Resilient modulus of subbase course = 420 ksi California Bearing Ratio (CBR) of base course material California Bearing Ratio (CBR) of subbase material California Bearing Ratio (CBR) of subgrade material - 28.5 ksi = 15 ksi = 70 = 30 = 6 Reliability of the pavement design Standard deviation in traffic forecast and pavement performance 95% = 0.45 Initial serviceability index Terminal serviceability index = 4.0 = 2.5 It is expected that the structure will only take a day for the surface runoff to be drained from within the pavement, and the pavement structure will be exposed to moisture levels approaching saturation 50% of the time. Acceptability criterion: To check if the initially assumed value of structural number SN is acceptable, use the formula: e SNassumed - SN SNassumed x 100 If o s 30%, accepted; otherwise, reiterate the procedure. Questions: i. Calculate the Design Equivalent Single-Axle Load (ESAL) to be used for the design of the flexible pavement. Calculate the most suitable flexible pavement structure using 1993 AASHTO method. Prepare a typical cross-section sketch ii. of the structure. Final Output: Submit a compressed folder (.zip filename extension) containing 1) your complete solution to the questions in Excel format and PDF format, and 2) nomograph solution. Use the template attached herewith.
Transcribed Image Text:Situation: A proposed four-lane divided highway is to be constructed using asphalt concrete surface layer. Table below shows the fvevRAr traffic data collected from DPWH regional office along the proposed alignment. Load per axle, Ibs 2,000 10,000 14,000 6,000 Vehicle Number of Description AADT Code axles В, В1, В2 12-2 12-3 Light Vehicles (sedan, SUV, pickup) Semi-trailer trucks Truck semi-trailer Public buses, single-unit trucks 75,000 4,000 1,500 15,700 5 D-4 2 Forecasted annual traffic growth Percentage of traffic on design lane Design service life of pavement = 4.Y% = 32% = 20 years Moreover, the regional office plans to adapt a flexible pavement with the following specifications listed below. Resilient modulus of asphalt concrete Resilient modulus of base course Resilient modulus of subbase course = 420 ksi California Bearing Ratio (CBR) of base course material California Bearing Ratio (CBR) of subbase material California Bearing Ratio (CBR) of subgrade material - 28.5 ksi = 15 ksi = 70 = 30 = 6 Reliability of the pavement design Standard deviation in traffic forecast and pavement performance 95% = 0.45 Initial serviceability index Terminal serviceability index = 4.0 = 2.5 It is expected that the structure will only take a day for the surface runoff to be drained from within the pavement, and the pavement structure will be exposed to moisture levels approaching saturation 50% of the time. Acceptability criterion: To check if the initially assumed value of structural number SN is acceptable, use the formula: e SNassumed - SN SNassumed x 100 If o s 30%, accepted; otherwise, reiterate the procedure. Questions: i. Calculate the Design Equivalent Single-Axle Load (ESAL) to be used for the design of the flexible pavement. Calculate the most suitable flexible pavement structure using 1993 AASHTO method. Prepare a typical cross-section sketch ii. of the structure. Final Output: Submit a compressed folder (.zip filename extension) containing 1) your complete solution to the questions in Excel format and PDF format, and 2) nomograph solution. Use the template attached herewith.
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