Thursday, 26 March 2015

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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