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an excel program that will help you design your concrete footing....=)
DESIGN
OF FOOTING FOR CORNER COLUMN
Data :Load from side or edge column = 220 KN Column size = 230 x 230 mm SBC of soil =120 KN /m2 Concrete Mix =M20 Steel Grade = Fe 415 Clear cover of bottom slab =50 mm Design :-
1. SIZE OF FOOTING : Load on column
P
=220 KN
Self weight of footing 10%
=
22 KN
SBC of soil
------242 KN --------=120 KN/m2
Area of footing required
=
Total load on soil
P1
242 / 120 =2.02 m2
Provide 1.50 x 1.50 m square footing. Area provided
=2.25 m2 > 1.83 m2
2. NET UPWARD SOIL PRESSURE : Load from column
=220 KN
Area of footing
=2.25 m2
Net upward soil pressure
=220 / 2.25 =97.80 KN/m2 < 120 KN/m2(SBC)
O.K.
3. FOOTING SLAB : Provide overall depth of slab Bending moment
=
=250 mm 97.8 x 0.8852/2 =38.30 KN.m
Factored moment
Mu
=1.5 x 38.30 =57.45 KN.m
K=Mu /b d2
= 57.45 x 106 / 1000 x 2852 = 0.71
100 Pt from Table 2 of Design Aid Ast =
0.206/100x1000x 285 = 587 mm2
Provide 12 Φ RTS @ 150 mm C / c
=0.206 (Ast=754 mm2
587 mm2 ).
Distributors:
Minimum Ast =0.20/100x1000x 300 =600 mm2 Provide 12 Φ RTS @ 150 mm C / c
(Ast=754 mm2
600 mm2 )
4. BEAM DESIGN : Load /m run on beam Load from footing slab (1/2x2.12x0.885)x97.8 2.12
} x2
}
=86.55 KN/m
Self weight of beam assuming size as 300 x 600 mm 0.35 x (0.60 – 0.35) x 25 Total udl Span
= 2.63 KN/m --------= 89.18 KN/m ----------
w
l
=2.12 m
Maximum bending moment
=wl2/2 = 89.18x 2.122 /2 = 200.41 KN.m
Factored B.M.
Mu
=1.50 x 200.41 =300.62 KN.m
K = 300.62 x 106
= 3.18
350 x 5202 Increase depth of beam to 750 mm. K = 300.62 x 106
= 1.91
350 x 6702 100 Pt from Table 2 of Design Aid = 0.605 Ast
Check for shear: Maximum Shear Force = 89.20 x 2.12 = 189.10 KN. Factored SF Vu = 1.5 x 189.10 = 283.66 KN. Shear stress = 283.66 x 103 350 x 670 =0.12 N/ mm2 < 2.80 N/mm2 Provide 8 Φ RTS
