Reacon = 82 ton

Slab thickness = 22 cm

250.316 0.316* 1.11( / 2)

1.5

FcuN mm

c

= shear stress) punching(allowable Q

For column 25*70

Critical punching perimeter =(70+2*19)*2 +(25+2*19)*2=342cm (for the interior column)

Where slab depth = height-cover=22-3=19cm

*

. .

Qup

Areaof punching

actual punching stress = -

Area of punching (m2) = perimeter=depth=3.42*0.19=0.64m2

Qup=82-=(0.7+2*0.19)*(0.25+2*0.19)*(1.8)=80.1 ton

Where the weight of unit area of the oor = 1.8 t/m2 (ulmate load)

* 1.15*801.43( / 2)

. . 0.64

QupN mm

Areaof punching