Design a roof slab over a passage of size $10m \times 2.5m$ provided at the entrance of a public building. The slab is supported by $230mm$ wide beam and carries super imposed load of $3 kN/m^2.$

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Design a roof slab over a passage of size

$10m \times 2.5m$ provided at the entrance of a public building. The slab is supported by

$230mm$ wide beam and carries super imposed load of

$3 kN/m^2.$

written 8.8 years ago by

teamques10 ★ 69k

• modified 4.3 years ago

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

reinforced concrete structures theory

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written 8.8 years ago by

teamques10 ★ 69k

• modified 8.8 years ago

$l_y=10+0.23=10.23$ $ 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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