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Page 1
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Page 2
RC Floor
Solid slab
Joist Floor or Ribbed slab
Flat slab
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Page 3
Solid Slab
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Page 4
Solid Slab
One-way slab Two-way slab
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Page 5
Solid Slab
One-way slab Two-way slab VS.
.
m = SL S = L = One-way slab m < 0.5
Two-way slab m 0.5
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Page 6
Solid Slab Design
One-way slab Two-way slab VS.
1. 6 mm 2. 3 3. 0.25% 4. 0.20% 5. 1.00 m
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Page 7
Moment in Solid Slab
h
1 2 1 > 2 MS ML P
S/5 L/5
MS > ML
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Page 8
RC Slab Design
1.00 m M1 = Rbd
2 = R 1.00 d2 = Rd2 R = 1
2 fc kj
M = CwS2 C = w= (kg/m2) S = (m) MM1
+
90
AS =
M
fsjd
As 1.00 m
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Page 9
RC Slab Design
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Page 10
RC Slab Design
TABLE OF MOMENT COEFICIENT.
CASE 1 CASE 2 CASE 3 CASE 4 CASE 5
m -M
cont
-M
disc +M m
-M
cont
-M
disc +M m
-M
cont
-M
disc +M m
-M
cont
-M
disc +M m
-M
cont
-M
disc +M
Short Span
0.5 0.083 0.062 0.5 0.085 0.042 0.064 0.5 0.09 0.045 0.068 0.5
0.098 0.049 0.074 0.5 0 0.055 0.083
0.6 0.063 0.047 0.6 0.069 0.035 0.052 0.6 0.078 0.039 0.059 0.6
0.09 0.045 0.068 0.6 0 0.053 0.080
0.7 0.055 0.041 0.7 0.062 0.031 0.047 0.7 0.071 0.036 0.054 0.7
0.082 0.041 0.062 0.7 0 0.047 0.072
0.8 0.048 0.036 0.8 0.055 0.027 0.041 0.8 0.064 0.032 0.048 0.8
0.074 0.037 0.056 0.8 0 0.043 0.064
0.9 0.04 0.03 0.9 0.048 0.024 0.036 0.9 0.057 0.028 0.043 0.9
0.066 0.033 0.05 0.0 0 0.038 0.057
1.0 0.033 0.025 1.0 0.041 0.021 0.031 1.0 0.049 0.025 0.037 1.0
0.058 0.029 0.044 1.0 0 0.033 0.050
Long Span
1.0 0.033 0.025 1.0 0.041 0.021 0.031 1.0 0.049 0.025 0.037 1.0
0.058 0.029 0.044 1.0 0 0.033 0.050
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Page 11
Example 4 RC Slab Design
Assignment 1 3 n = 10, fc = 250 ksc, fy = 2400 ksc
. fc = 0.45f c = 0.45*250 = 112.5 ksc fs = 0.50fy = 0.50*2400 =
1200 ksc M = CwS2 -Mcont = 0.049*(288+100)*4
2 = 304.2 kg.m -Mdist = 0.025*(288+100)*4
2 = 155.2 kg.m +M = 0.037*(288+100)*4
2 = 229.7 kg.m k jd k = 1
1+fs
nfc
= 11+
120010112.5
= 0.4839
j = 1 k3 = 1 0.4839
3 = 0.8387
R = 12 fc kj = 22.83 ksc
M1 = Rd2 = 22.83 9.52= 2,060 kg.m
S1 S2
S1 S2
S1 S2
4.00 2.00
4.0
0
4.0
0
4.0
0
m = SL=4.004.00
m=1.0
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Page 12
Example 4 RC Slab Design
Assignment 1 3 S2 n = 10, fc = 250 ksc, fy = 2400 ksc
d=12-2.5=9.5 cm 1) -Mcont = 304.2 kg.m AS =
M
fsjd = 304.2
12000.83870.095=3.18 cm2/m
2) -Mdist = 155.2 kg.m AS =
M
fsjd = 155.2
12000.83870.095=1.62 cm2/m
3) +M = 229.7 kg.m AS =
M
fsjd = 229.7
12000.83870.095=2.40 cm2/m
As > 0.25% Asmin > 0.0025*(12*100) = 3.00 cm
2/m Design: +M [email protected] m As=3.20 > 3.00 cm2/m -M [email protected] m
As=3.58 > 3.18 cm2/m
S1 S2
S1 S2
S1 S2
4.00 2.00
4.0
0
4.0
0
4.0
0
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Page 13
Example 4 RC Slab Design
Assignment 1 3 S2 n = 10, fc = 250 ksc, fy = 2400 ksc
d=12-2.5-1.0=8.5 cm 1) -Mcont = 304.2 kg.m AS =
M
fsjd = 304.2
12000.83870.085=3.56 cm2/m
2) -Mdist = 155.2 kg.m AS =
M
fsjd = 155.2
12000.83870.085=1.81 cm2/m
3) +M = 229.7 kg.m AS =
M
fsjd = 229.7
12000.83870.085=2.68 cm2/m
As > 0.25% Asmin > 0.0025*(12*100) = 3.00 cm
2/m Design: +M [email protected] m As=3.20 > 3.00 cm2/m -M [email protected] m
As=3.58 > 3.56 cm2/m
S1 S2
S1 S2
S1 S2
4.00 2.00
4.0
0
4.0
0
4.0
0
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Page 14
Example 4 RC Slab Design
Assignment 1 3 S2 n = 10, fc = 250 ksc, fy = 2400 ksc
Detail: RB9 @ 0.20 m
RB9 @ 0.20 m
RB9 @ 0.18 m
RB9 @ 0.18 m
RB9 @ 0.20 m
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Page 15
Diameter Type
weight (kg/m)
o (cm)
Number of reinforced steel (bar)
1 2 3 4 5 6 7 8 9
mm In As (cm2)
6 1/4
RB
0.222 1.885 0.283 0.565 0.848 1.131 1.414 1.696 1.978 2.262
2.544
9 3/8 0.499 2.828 0.636 1.272 1.909 2.545 3.182 3.820 4.455
5.090 5.726
12 1/2 0.888 3.770 1.131 2.262 3.393 4.526 5.650 6.785 7.915
9.045 10.180
15 5/8 1.390 4.710 1.767 3.534 5.295 7.065 8.830 10.600 12.360
14.140 15.900
19 3/4 2.230 5.965 2.835 5.670 8.500 11.340 14.170 17.020 19.850
22.680 25.500
22 7/8 2.980 6.905 3.801 7.602 11.400 15.200 19.000 22.800
26.600 30.400 34.200
25 1 3.850 7.850 4.909 9.818 14.730 19.640 24.530 29.450 34.380
39.280 44.200
28 1 1/8 4.830 8.790 6.158 12.320 18.480 24.630 30.800 36.960
43.120 49.280 55.420
12 1/2
DB
0.888 3.771 1.130 2.260 3.390 4.520 5.650 6.780 7.910 9.040
10.170
16 5/8 1.580 5.029 2.010 4.020 6.030 8.040 10.050 12.060 14.070
16.080 18.090
19 3/4 2.230 5.971 2.840 5.680 8.520 11.360 14.200 17.040 19.880
22.720 23.560
20 3/4 2.470 6.290 3.140 6.280 9.420 12.560 15.700 18.840 21.980
25.120 28.260
22 7/8 2.980 6.910 3.800 7.600 11.400 15.200 19.000 22.800
26.600 30.400 34.200
25 1 3.850 7.857 4.910 9.820 14.700 19.600 24.500 29.400 34.400
39.300 44.200
28 1 1/8 4.830 8.800 6.160 12.320 18.480 24.640 30.800 36.960
43.120 49.280 55.440
32 1 1/4 6.310 10.060 8.040 16.080 24.120 32.160 40.200 48.240
56.280 64.320 72.360
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Page 16
Joist Slab
T 4 300 kg/m2
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Page 17
Joist Slab
(t) > 0.05 m 0.90 m > 0.08 m 1-RB12
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Page 18
Grand Slab
B B
B B
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Page 19
Grand Slab
B B
(t) > 0.10 m #RB6 @ 0.20 m #RB6 @ 0.25 #RB9 @ 0.25 0.05 m
Pavement Design Highway Engineering
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Page 20
Flat Slab
(Prestressed Concrete) Pretensioned Posttensioned Technique
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Page 21
Flat Slab
1.33 20
40 m 4.00 m
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Page 22
Flat Slab
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Page 23
Flat Slab
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Page 24
Flat Slab
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Page 25
Flat Slab
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Page 26
Flat Slab
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Page 27
Flat Slab
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Page 28
Flat Slab
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Page 29
Flat Slab
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Page 30
Flat Slab
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Page 31
>
RB12
S
250
S
300
S
150
S
100
