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SLAB CALCULATION
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Structural Model :
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Type Slab= S1ly51,0<2,5( two way slab )
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Thickness=100
mm
lx5
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Material:
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 fc' =186,75
kg/cm2
from SKSNI T-15-1991-03 table, we find :
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 fy =2400
kg/cm2
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Mlx = Mtx =
0.001 q lx2 *
51Ly/Lx1,01,11,21,31,41,51,61,71,81,92,02,12,22,32,42,5
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Mly = Mty =
0.001 q lx2 *
51Mlx = Mtx51576368727578808182828283838383
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Mly = Mty51535455555554545454535353525251
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12
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Loading :a.
Dead Load
- Selfweight of Slab
=240 kg/m2
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- Tile , t -
3cm=72 kg/m2
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- Mortar, t -
2cm=42 kg/m2
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- Ceiling, ( Asbes Cement + hanger )
=18 kg/m2
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- M & E
=0 kg/m2
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q dl=372 kg/m2
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b.
Live Load
q ll=250 kg/m2
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c.
Ultimate Load
q u=
1.2 q dl + 1.6 q ll
=846,4 kg/m2
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Moment :
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 Mlx =- Mtx=1079,16
kg m
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 Mly =- Mty=1079,16
kg m
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a. Rebar Required :
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a.1 ( x - dirrection )
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m =fy=15,11930073;Rn = Mu =69,67716942
kg/cm2
d =44 mm ;ø =0,8
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0.85 fc'
ø b d2
b =1000 mm
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 r req =1
1 - 1 - 2 m Rn
= 0,0430 > r min
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mfy
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 r min =1.4 =0,0058 rmin=0,0058
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 fy
As = r o * b * d =
18,93 cm2
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 r r =
1.33 * r req
r o= 0,0430
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=0,0572
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a.2 ( y - dirrection )
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m =fy=15,11930073;Rn =Mu=43,01498724
kg/ cm2 ;
d =56 mm ;ø =0,8
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0.85 fc'
ø b d2
b =1000 mm
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 r req =1
1 - 1 - 2 m Rn
= 0,0214 > r min
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mfy
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 r min =1.4 =0,0058 rmin=0,0058
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 fy
As = r o * b * d =
 9,41 cm2
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 r r =
1.33 * r req
r o= 0,0214
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=0,0284
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b. Shrinkage and Temperature
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 r min =0.0018
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As min =
0.0018 * b * d =
0,792
cm2
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A so =18,93
cm2
x - dirrection
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A so =9,41
cm2
y - dirrection
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c. Re-bar Selection
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D =12
mm ;
 Ab = 1,13
cm2
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Longitudinal Re-bar ( for Shorter span )
 S max= 3 * h=300
mm
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Transversal Re-bar ( for Longer span )
 S max= 5 * h=500
mm
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No. of Re-bar per meter,
n =
A so / Ab
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n x=17
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n y=8
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Spacing of Re-bar,
s =
1000/(n-1)
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s x =50 mmuse D
12 @ 50 mm
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s y =125 mmuse D
12 @ 125 mm
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SKETCH :50100
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50
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12 @ 50 mm
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d. Crack Control
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Chose "1" or "2" :
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INTERIOR EXPOSURE
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1
EXTERIOR EXPOSURE
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2
INTERIOR EXPOSURE
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s =50
mm
;b =
1.35 for Slab
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bw =1000
mm
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dc =44
mm
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A =2 * s* dc =4400
mm2
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 fs =0.6 * fy =144 MPa
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 z =
fs * ( dc * A)1/3
 =8330,369713
N/mm
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 =8,330369713
MN/m
<30
MN/m
OK !!
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 w =
11*b *fs* (dc*A)1/3
 =0,1237059902 mm<0,4mmOK !!
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100000
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