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 = WT = Wc + WF = Wc + 10% Wc
Step 2:-
Calculation of Foundation Area (A) = WT/p’ p’= Bearing capacity of soil
Step 3:-
Calculation of upward pressure (p) = Wc /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
Wc – pL2 = 4 b D q (q) all = 10 kg/cm2 D = (Wc – pL2 ) / 4 b D q
Step 6:-
As = M / fy z (As)min = ρmin b d
Step 7:-
Nos. of bars:-
Number of bars = As / Area of selected bars
Square Foundation Design steps (without Moment)
Step 1:-
Calculation of loads = WT = Wc + WF = Wc + 10% Wc
Step 2:-
Calculation of Foundation Area (A) = WT/p’ p’= Bearing capacity of soil
Step 3:-
Calculation of upward pressure (p) = Wc /A
Step 4:-
Calculation of projection
a = (L – b) / 2
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) ( a /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
Wc – pL2 = 4 b D q (q) all = 10 kg/cm2 D = (Wc – pL2 ) / 4 b D q
Step 6:- calculation of steel area (As)
As = M / fy z (As)min = ρmin b d = 0.005 bd
Step 7:- calculation of bar number
Number of bars = As / Area of selected bars
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