RCC SLAB ROOF DESIGN EXAMPLE

                                         R.C.C slab roof 6mx3mx0.12m

 R.C.C work 1:2:4: in footing excluding steel and it’s bending.

= 6.3x3.3x0.12 (0.15m in both sides)

= 2.495 cum

Steel reinforcing bars including bending-

Main bars:  12mm dia @0.89kg/m straight bars

24cm c/c . No (6.3-0.08)/24+1( side covers=2x4cm)

= 27Nos.

L=3.3-2covers+2hooks  (Take cover 4cm, hook 9xd

= 3.3-(2x4cm)+(2x9x12mm )

= 3.44m

27Nosx3.44x0.89 =82.66kg

Bent up bars: 26 Nos 12 mm dia @0.89kg/m

= 3.44m+0.08( add one depth)

= 3.52m

26Nosx3.52x0.89 =81.45kg

Distribution bars:  6mm dia  @0.22 kg/m

           Bottom bars central portion 18cm c/c

(No.= 2.00/0.18+1=12 Nos

Bottom bars 2x3 two sides

Top bars two sides 2x3

Total No of bars = 12+2x3+2x3= 24Nos

L=6.3-2covers+2hooks  (Take cover 4cm, hook 9xd

= 6.3-(2x4cm)+(2x9x6mm )

= 6.33m

24Nosx6.33x0.22=33.42kg

Total steel = 82.66+81.45+33.42

=197.53Kg

ABSTRACT :

1.     R.C.C work 1:2:4: in beam excluding    2.495cum

steel and it’s bending

2.     Steel reinforcing bars including bending-   197.53kg 

 3     Centering & shuttering required:

Area of centering and shuttering

=6mx3m

=18sqm

   

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