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  •  Design an isolated square footing of uniform thickness for a RC column of 600kN and having a base size of 500mm x 500mm. The safe bearing capacity AP of soil may be taken as 1

 Design an isolated square footing of uniform thickness for a RC column of

600kN and having a base size of 500mm x 500mm. The safe bearing capacity AP

of soil may be taken as 120kN/ m3. Use M20 concrete and Fe415 steel.

Answers (1)

best_answer

Column load = 600?kN

Column size = 500?mm × 500?mm

SBC = 120?kN/m²

Concrete = M20, Steel = Fe415

\begin{aligned} &A=\frac{600}{120}=5 m^2\\ &\text { Side }=\sqrt{5} \approx 2.25 m\\ &q=\frac{600}{2.25 \times 2.25} \approx 118.5 kN / m^2 \end{aligned}

\begin{aligned} &M=\frac{q}{8}(L-a)^2=\frac{118.5}{8}(1.75)^2 \approx 45.4 kNm\\ &d=\sqrt{\frac{M \times 10^{f}}{0.138 \times f_{c k} \times b}} \approx 102 mm \end{aligned}

\begin{aligned} &\tau_v=\frac{V}{u \times d} \approx 1.018 N / mm^2<1.25(safe)\\ &A_{s t} \approx 633 mm^2 / m \end{aligned}

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Divya Sharma

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