A cc slab of thickness 25 cm is constructed over a base of granular material with a modulus of reaction 8 kg/cm3. The maximum temperature differential between the top and bottom of the slab is found to be 20°C during summer day and night. The spacing between transverse joints is 4.5 m and the spacing between longitudinal joints is 3.5 m. The design wheel load is 5100 kg, radius of contact area is 15 cm, Poisson’s ratio is 0.13, modulus of elasticity is 2×105 kg/cm2, the thermal coefficient is 10 ×10-6 /°C and the coefficient of friction is 1.5. Using the above information, find the worst combination of stresses during mid-night.

A cc slab of thickness 25 cm is constructed over a base of granular m

1.	A cc slab of thickness 25 cm is constructed over a base of granular material with a modulus of reaction 8 kg/cm3. The maximum temperature differential between the top and bottom of the slab is found to be 20°C during summer day and night. The spacing between transverse joints is 4.5 m and the spacing between longitudinal joints is 3.5 m. The design wheel load is 5100 kg, radius of contact area is 15 cm, Poisson’s ratio is 0.13, modulus of elasticity is 2×105 kg/cm2, the thermal coefficient is 10 ×10-6 /°C and the coefficient of friction is 1.5. Using the above information, find the worst combination of stresses during mid-night.
A.	16 kg/cm2
B.	15.99 kg/cm2
C.	16.99 kg/cm2
D.	15 kg/cm2
Answer» D. 15 kg/cm2

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