A 400 mm x 600 mm box section has a uniform wall thickness of 75 mm except at the bottom which is 140mm thick. It is reinforced with 3 - 25mm at d = 540mm. n = 9, fc= 20 MPa and fs = 124 MPa. 1. Calculate the moment capacity of concrete. 2. Find the moment capacity of steel. 3. Determine the maximum simply supported span of the beam if it is to carry a midspan load of 80 kN.

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