n a slab-floor system with the total depth of 22 in., the flange effective width was determined to be 40 in. The beams have a web width of 14 in. and the slab thickness is 3 in. Design the reinforcement for a typical interior beam if the factored applied moment, Mu is 9500 k-in. f’c = 6 ksi and fy = 80 ksi. Draw the detailing.
n a slab-floor system with the total depth of 22 in., the flange effective width was determined to be 40 in. The beams have a web width of 14 in. and the slab thickness is 3 in. Design the reinforcement for a typical interior beam if the factored applied moment, Mu is 9500 k-in. f’c = 6 ksi and fy = 80 ksi. Draw the detailing.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
In a slab-floor system with the total depth of 22 in., the flange effective width was determined to
be 40 in. The beams have a web width of 14 in. and the slab thickness is 3 in. Design the
reinforcement for a typical interior beam if the factored applied moment, Mu is 9500 k-in. f’c = 6
ksi and fy = 80 ksi. Draw the detailing.
Transcribed Image Text:BAR
SIZE
#3
#4
#5
#6
Total Areas for Various Numbers of Reinforcing Bars
#8
#9
#10
NOMINAL
DIAMETER
(in.)
WEIGHT
(lb/ft)
1
2
0.376
0.668
1.043
1.502
2.044
2.670 0.79
3.400
4.303 1.27 2.54
5.313
7.65
13.60
4
0.11 0.22
0.20 0.40
0.31 0.62
0.44 0.88
0.60 1.20
3
0.33
0.44
0.55
0.88
0.60 0.80
1.00
1.20
1.40 1.60
0.93
1.24
1.55
1.86
2.17
2.48
1.32 1.76
2.20
2.64 3.08 3.52
1.80
2.40
3.00
3.60
4.20
4.80
3.16
3.95 4.74
5.53 6.32
1.58 2.37
1.00 2.00 3.00
4.00 5.00 6.00 7.00 8.00
3.81 5.08 6.35 7.62 8.89 10.16
1.56 3.12
4.68 6.24 7.80 9.36 10.92 12.48
2.25
4.50
6.75 9.00 11.25 13.50 15.75
18.00
4.00 8.00 12.00 16.00 20.00 24.00 28.00 32.00 36.00
20.25
NUMBER OF BARS
5
6
0.375
0.500
0.625
0.750
0.875
1.000
1.128
1.270
#11
1.410
#14ª
1.693
#18ª
2.257
#14 and #18 bars are used primarily as column reinforcement and are rarely used in beams.
7
0.66 0.77
8
Minimum Width of Web for Multiple Bars, in., ACI 318-14a,b,c
#3 "U" Shaped Stirrups
#4 "U" Shaped Stirrups
Number of Bars in a Single Layer
3
4
5
6
2
Number of Bars in a Single Layer
3 4
9.00 10.50
5
2
6.75 8.25 9.75 11.25 12.75
6
7.50
12.00
13.50
6.88
10.13 11.75 13.38
7.63
9.25 10.88 12.50 14.13
8.50
8.75 10.50 12.25 14.00
7.00
7.75
9.50 11.25 13.00 14.75
7.13
7.88
9.75 11.63 13.50 15.38
9.25 11.25 13.25
10.00 12.00 14.00 16.00
7.25
7.51 9.76 12.02 14.27
9.00 10.88 12.75 14.63
15.25
16.53
17.95
8.00
8.26 10.51 12.77 15.02 17.28
7.79 10.33 12.87 15.41
8.54 11.08 13.62
16.16 18.70
17.28 20.10
8.82 11.64 14.46
9.39 12.77 16.16 19.54 22.93
10.77 15.29 19.80 24.31 28.83
9
Bar Size
Designation
#4
#5
#6
#7
#8
#9
# 10
# 11
#14
# 18
*Minimum spacing and bend radii based on ACI 318-2014, Sections 25.2.1 and 25.3.2 (3/4 in. max agg. size).
Bars are not lap-spliced or bundled.
*Cover for stirrups assumed to be 1 1/2 in. (based on interior exposure).
0.99
1.80
2.79
3.96
5.40
7.11
9.00
11.43
14.04
Add for Each
Additional Bar
(in.)
1.50
1.63
1.75
1.88
2.00
2.26
2.54
2.82
3.39
4.51
10
1.10
2.00
3.10
4.40
6.00
7.90
10.00
12.70
15.60
22.50
40.00
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