12.7 Figure P12.7 shows a concrete pavement with the thicknesses and elastic moduli as indi- cated. Assume a modulus of rupture of 650 psi, a load transfer coefficient of 3.2, a service- ability loss from 4.5 to 2.0, and poor drainage with 5% of time near saturation. Determine the performance traffic by Eq. 12.21 without the reliability term and check the result by the AASHTO design chart. [Answer: 8.5 × 106] Portland Cement Concrete E = 4 x 106 psi Granular Subbase ESB = 30,000 psi Subgrade MR = 5000 psi 8 in. 8 in. FIGURE P12.7

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Chapter2: Loads On Structures
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12.7 Figure P12.7 shows a concrete pavement with the thicknesses and elastic moduli as indi-
cated. Assume a modulus of rupture of 650 psi, a load transfer coefficient of 3.2, a service-
ability loss from 4.5 to 2.0, and poor drainage with 5% of time near saturation. Determine
the performance traffic by Eq. 12.21 without the reliability term and check the result by
the AASHTO design chart. [Answer: 8.5 × 106]
Portland Cement Concrete
E = 4 x 106 psi
Granular Subbase
ESB = 30,000 psi
Subgrade MR = 5000 psi
8 in.
8 in.
FIGURE P12.7
Transcribed Image Text:12.7 Figure P12.7 shows a concrete pavement with the thicknesses and elastic moduli as indi- cated. Assume a modulus of rupture of 650 psi, a load transfer coefficient of 3.2, a service- ability loss from 4.5 to 2.0, and poor drainage with 5% of time near saturation. Determine the performance traffic by Eq. 12.21 without the reliability term and check the result by the AASHTO design chart. [Answer: 8.5 × 106] Portland Cement Concrete E = 4 x 106 psi Granular Subbase ESB = 30,000 psi Subgrade MR = 5000 psi 8 in. 8 in. FIGURE P12.7
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