4.8 A concrete slab, 40 ft long, 11 ft wide, and 9 in. thick, is placed...

  

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4.8 A concrete slab, 40 ft long, 11 ft wide, and 9 in. thick, is placed on a subgrade having a modu- lus of subgrade reaction of 200 pci. A 9000-lb single-wheel load is applied on the edge of the slab over a circular area with a contact pressure of 100 psi, as shown in Figure P4.8. Compute (a) the curling stress at the edge during the night when the temperature differential is 1.5°F per inch of slab, (b) the loading stress due to the 9000-lb wheel load, and (c) the combined stress at the edge beneath the load due to (a) and (b). [Answer: 140.4, 290.3, 149.9 psi] 40 ft h = 9 in. k = 200 pci At = +13.5°F %3D 11 ft 100 psi 9000 lb due to combined curling and loading ? FIGURE P4.8 4.8 A concrete slab, 40 ft long, 11 ft wide, and 9 in. thick, is placed on a subgrade having a modu- lus of subgrade reaction of 200 pci. A 9000-lb single-wheel load is applied on the edge of the slab over a circular area with a contact pressure of 100 psi, as shown in Figure P4.8. Compute (a) the curling stress at the edge during the night when the temperature differential is 1.5°F per inch of slab, (b) the loading stress due to the 9000-lb wheel load, and (c) the combined stress at the edge beneath the load due to (a) and (b). [Answer: 140.4, 290.3, 149.9 psi] 40 ft h = 9 in. k = 200 pci At = +13.5°F %3D 11 ft 100 psi 9000 lb due to combined curling and loading ? FIGURE P4.8