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In: Civil Engineering

. A prestressed road bridge of span 16 + 0.01 (35× 2) m consists of a...

. A prestressed road bridge of span 16 + 0.01 (35× 2) m consists of a concrete slab of 420 mm thick with parallel post-tensioned cables, in each of which the force at transfer is 440 kN. If the bridge is required to support a uniformly distributed applied load of 38 + 0.01 (135) kN/m , with tensile stress in the concrete not exceeding 0.85 N/mm2 at any time. Calculate the maximum horizontal spacing of the cables, their distance from the soffit of the slab at mid-span and their lowest possible position at
supports. Assume 15 % loss of prestress after transfer. Also calculate the number of steel wires used in each cable with the permissible stress of 1200 N/mm2 for 7 mm diameter steel wire. Assume the density of the concrete is 24 kN/m

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Ally Wells answered 8 months ago
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