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Square Foundation Design steps (with Moment)

نوت: در صورت موجودیت مومنت  عن المرکزیت (e)Eccentricity به وجود آمده و به اندازه (e) عمل قوه به سمت x  و y انتقال (shift) می گردد.

Step 1:-

           Calculation of loads = W_T = W_c + W_F = W_c + 10% W_c

Step 2:-

           Calculation of Foundation Area (A) = W_T/p’           p’= Bearing capacity of soil

Step 3:-

           Calculation of upward pressure (p) = W_c /A

Step 4:-

           Calculation of projection 

           a1 = (L-b)/2 + e

           a2 = (L-b)/2 - e

Step 5:-

          Calculation of Depth of Foundation (D)

a)     B.M. consideration :

b)     Punching shear consideration :

a)       B.M. consideration :

(B.M)_max = Resisting Moment

pL (a)²/2 = k b d²  or  Q b d²  

Q=0.185 * f’c *(.09) (permissible stress/Mark of concrete )

d=

D = d + cover + dia . of bars

b)  Punching shear consideration:

Punching load = punching resistance

W_c – pL² = 4 b D q              (q) _all = 10 kg/cm²    D = (W_c – pL² ) / 4 b D q             

Step 6:-

            As = M / fy z              (As)_min = ρ_min b d

Step 7:-

            Nos. of bars:-

            Number of bars = As / Area of selected bars