Eccentric Footing

Area of steel reqd.

157 mm2

So,provide =

no. 10

Dia. 10 mm

Ast.provided 785 mm2

Check for One-way shear = Vud = 18 Kn Shear resi.by con. Tuc Pt.= 0.2 % 0 .432N/mm2 Vuc.= 137 .1Kn Safe Distribution steel  Ast reqd = So,provide =

580 mm2 Dia. 8

Spacing 150 mm

Check for bearing pressure:  Actual pressure 6 .155N/mm2  A1 = 0 .28m2  A2 = 0 .10m2 sqrt(A1/A2) = 1.643314666 Permissible ultimate bearing stress = 13.5 Safe

Ast.provided 141372 mm2

637.5

Pt <=0.15 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3

M20 0.28 0.36 0.48 0.56 0.62 0.67 0.72 0.75 0.79 0.81 0.82 0.82 0.82

Concrete Grade M25 M30 0.29 0.36 0.49 0.57 0.64 0.7 0.74 0.78 0.82 0.85 0.88 0.9 0.92 0.25 0.5 0.3366 0.401568

0.36 0.48

Column size:

Loads:

SBC Mux = T.L.on footing: (Working)  Area of footing required: B.M.at col.base= Provide area  Area provided q= tan α = tan α provided= Length reqd= Min.length reqd= So,provide footing size  Area =

b 300 mm

D 570 mm

Cover 40 mm

d 530 mm

Factored Pu 330 Kn

Unfactored P 220 Kn

Fck 20 N/mm2

Fy 415 N/mm2

400 Kn/m2

267 Kn/m2

D 660 mm

Offset 100 mm

192 .5Kn-m 242 Kn 0 .91m2

0 .6m L 2250 mm 1 .125m2 0 .196N/mm2 1.27 3.3 Safe 1 .8m 2137 mm Bf Lf   500 mm 2250 mm 1 .13m2 Safe

Projection Max projection

157 mm 1267 mm

Intensity of soil Pressure

293 Kn/m2

Depth reqd Mux= Reqd.eff.Depth = So,provide total D= d=

117 .7Kn-m 292 mm 600 mm 540 mm

Check for Two-way shear = Perimeter = 500 mm  Area resi.shear = 240000 mm2 Design shear =

B 500 mm

144 Kn Safe

480 mm Shear resi.by concrete Ks = 1 .118N/mm2 Vuc = 268 .3Kn

Area of steel reqd.

725 mm2

So,provide =

no. 10

Dia. 10 mm

Ast.provided 785 mm2

Check for One-way shear = Vud = 115 Kn Shear resi.by con. Tuc Pt.= 0.3 % 0 .432N/mm2 Vuc.= 103 .7Kn Unsafe Distribution steel  Ast reqd = So,provide =

360 mm2 Dia. 8

Spacing 150 mm

Check for bearing pressure:  Actual pressure 1 .930N/mm2  A1 = 0 .39m2  A2 = 0 .17m2 sqrt(A1/A2) = 1.50048725 Permissible ultimate bearing stress = 13.5 Safe

Ast.provided 141372 mm2

637.5

Pt <=0.15 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3

M20 0.28 0.36 0.48 0.56 0.62 0.67 0.72 0.75 0.79 0.81 0.82 0.82 0.82

Concrete Grade M25 M30 0.29 0.36 0.49 0.57 0.64 0.7 0.74 0.78 0.82 0.85 0.88 0.9 0.92 0.25 0.5 0.3366 0.401568

0.36 0.48