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  3. . a prestressed road bridge of span 16 + 0.01 (35�

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

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Civil Engineering

. A prestressed road bridge of span 16 + 0.01 (35× 2) mconsists of a concrete slab of 420 mm thick with parallelpost-tensioned cables, in each of which the force at transfer is440 kN. If the bridge is required to support a uniformlydistributed applied load of 38 + 0.01 (135) kN/m , with tensilestress in the concrete not exceeding 0.85 N/mm2 at any time.Calculate the maximum horizontal spacing of the cables, theirdistance from the soffit of the slab at mid-span and their lowestpossible position at
supports. Assume 15 % loss of prestress after transfer. Alsocalculate the number of steel wires used in each cable with thepermissible 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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