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Design a roof slab over a passage of size 10m×2.5m provided at the entrance of a public building. The slab is supported by 230mm wide beam and carries super imposed load of 3kN/m2.

Use M20/Fe415. Draw neat sketch showing reinforcement details.

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ly=10+0.23=10.23

$ l_x=2.5+0.23=2.73 \\ Here\space \dfrac {l_y}{l_x}= \dfrac {10.23}{2.73}=3.74\gt2 \\ \text {Hence one way slab. }\\ d= \dfrac{\text { short effective span}}{\text{S⁄D ratio ×M.F}}=\dfrac {2.73 ×1000}{20×1.4} \\ d= 97.5mm ≈ 100mm \\ D= d+25 =125mm \\ \text {Load Calculation}\\ D.L = D×25=0.125×25=3.125 kN/m^2 \\ F.F = 1kN/m^2 \\ L.L …

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