3.plat
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D. PERENCANAAN PLAT LANTAI
Structural Model :
Type Slab = S1 ly 6.3 1.3 < 2.5 ( two way slab )
Thickness = 120 mm lx 5
Material :
fc' = 200 kg/cm2
from SKSNI T-15-1991-03 table, we find :
fy = 2400 kg/cm2
Mlx = Mtx 0.001 q lx * 68
Mly = Mty 0.001 q lx2 * 55
Loading : a. Dead Load - Selfweight of Slab = 288 kg/m2
- Tile , t - 2 cm = 48 kg/m2
- Mortar, t - 3 cm = 63 kg/m2
- Ceiling, ( Asbes Cement + hanger ) = 18 kg/m2
- M & E = 3 kg/m2
q dl = 420 kg/m2
b. Live Load q ll = 250 kg/m2
c. Ultimate Load q u = 1.2 q dl + 1.6 q ll = 904 kg/m2
Moment :
Mlx = - Mtx = 1536.8 kg m
Mly = - Mty = 1243 kg m
a. Rebar Required :
a.1 ( x - dirrection )
m = fy = 14.118 ; Rn = Mu = 32.4 kg/cm2
d = 77 mm ; = 0.8
0.85 fc' b d2
b = 1000 mm
r req = 1 1 - 1 - 2 m Rn = 0.0151 > r min
m fy
r min = 1.4 = 0.0058 rmin = 0.00583
fy As = r o * b * d = 11.64 cm2
r r = 1.33 * rreq r o = 0.01511
= 0.0201
a.2 ( y - dirrection )
m = fy = 14.118 ; Rn = Mu = 19.6 kg/cm2 d = 89 mm ; = 0.8
0.85 fc' b d2
b = 1000 mm
r req = 1 1 - 1 - 2 m Rn = 0.0087 > r min
m fy
r min = 1.4 = 0.0058 rmin = 0.00583
fy As = r o * b * d = 6.71 cm2
r r = 1.33 * rreq r o = 0.00871
= 0.0116
b. Shrinkage and Temperaturer m n = 0.0018
As min = 0.0018 * b * d = 1.4 cm2
A so = 11.64 cm2
x - dirrection
A so = 6.71 cm2
y - dirrection
c. Re-bar Selection
D = 12 mm ; Ab = 1.13 cm2
Longitudinal Re-bar ( for Shorter span ) S max = 3 * h = 360 mm
Transversal Re-bar ( for Longer span ) S max = 5 * h = 600 mm
No. of Re-bar per meter, n = A so / Ab
n x = 10.3
n y = 5.9
Spacing of Re-bar, s = 1000/(n-1)
s x = 100 mm use D 12 @ 100 mm
s y = 200 mm use D 12 @ 200 mm
SKETCH :
12 @ 100 mm
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d. Crack Control
Chose "1" or "2" : 2 INTERIOR EXPOSURE
1 EXTERIOR EXPOSURE
2 INTERIOR EXPOSURE
s = 100 mm ; b = 1.35 for Slab
bw = 1000 mm
dc = 31 mm
A = 2 * s* dc = 6200 mm2
fs = 0.6 * fy = 144 MPaz = fs * ( dc * A)
1/3= 8310.2 N/mm
= 8.3102 MN/m < 30 MN/m OK !!
w = 11*b*fs* (dc*A)1/3
= 0.1234 mm < 0.4 mm OK !!
100000
Structural Model :
Type Slab = S2 ly 5 2.1 < 2.5 ( two way slab )
Thickness = 120 mm lx 2.4
Material :
fc' = 200 kg/cm2
from SKSNI T-15-1991-03 table, we find :
fy = 2400 kg/cm2
Mlx = Mtx 0.001 q lx * 82
Mly = Mty 0.001 q lx2 * 53
Loading : a. Dead Load - Selfweight of Slab = 288 kg/m2
- Tile , t - 2 cm = 48 kg/m2
- Mortar, t - 3 cm = 63 kg/m2
- Ceiling, ( Asbes Cement + hanger ) = 18 kg/m2
- M & E = 3 kg/m2
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q dl = 420 kg/m2
b. Live Load q ll = 250 kg/m2
c. Ultimate Load q u = 1.2 q dl + 1.6 q ll = 904 kg/m2
Moment :
Mlx = - Mtx = 426.98 kg m
Mly = - Mty = 275.97 kg m
a. Rebar Required :
a.1 ( x - dirrection )
m = fy = 14.118 ; Rn = Mu = 9 kg/cm2
d = 77 mm ; = 0.8
0.85 fc' b d2
b = 1000 mm
r req = 1 1 - 1 - 2 m Rn = 0.0039 < r min
m fy
r min = 1.4 = 0.0058 rmin = 0.00513
fy As = r o * b * d = 3.95 cm2
r r = 1.33 * rreq r o = 0.00513
= 0.0051
a.2 ( y - dirrection )
m = fy = 14.118 ; Rn = Mu = 4.36 kg/cm2
d = 89 mm ; = 0.8
0.85 fc' b d2
b = 1000 mm
r req = 1 1 - 1 - 2 m Rn = 0.0018 < r min
m fy
r min = 1.4 = 0.0058 rmin = 0.00245
fy As = r o * b * d = 1.88 cm2
r r = 1.33 * rreq r o = 0.00245
= 0.0024
b. Shrinkage and Temperature
r min = 0.0018
As min = 0.0018 * b * d = 1.4 cm2
A so = 3.95 cm2
x - dirrection
A so = 1.88 cm2
y - dirrection
c. Re-bar Selection
D = 12 mm ; Ab = 1.13 cm2
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Longitudinal Re-bar ( for Shorter span ) S max = 3 * h = 360 mm
Transversal Re-bar ( for Longer span ) S max = 5 * h = 600 mm
No. of Re-bar per meter, n = A so / Ab
n x = 3.5
n y = 1.7
Spacing of Re-bar, s = 1000/(n-1)
s x = 400 mm use D 12 @ 375 mm
s y = 1500 mm use D 12 @ 1475 mm
SKETCH :
12 @ 375 mm
d. Crack Control
Chose "1" or "2" : 2 INTERIOR EXPOSURE
1 EXTERIOR EXPOSURE
2 INTERIOR EXPOSURE
s = 400 mm ; b = 1.35 for Slab
bw = 1000 mm
dc = 31 mm
A = 2 * s* dc = 24800 mm2
fs = 0.6 * fy = 144 MPa
z = fs * ( dc * A)1/3
= 13192 N/mm
= 13.192 MN/m < 30 MN/m OK !!
w = 11*b*fs* (dc*A)1/3
= 0.1959 mm < 0.4 mm OK !!
100000
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