Reinforcing Rebar Engineering Data

Civil Engineering Design Resources

Rebar (short for reinforcing bar ), also known as reinforcing steel , reinforcement steel and colloquially in Australia as reo , is a steel bar or mesh of steel wires used as a tension device in reinforced concrete and reinforced masonry structures to strengthen and hold the concrete in tension. Rebar's surface is often patterned to form a better bond with the concrete.

REINFORCING REBAR BAR DATA TABLES FOR THE USA:
Reinforcing Bar Properties
Bar Size
Diameter
Area
Perimeter
Weight
   
(in.)
(in.^2)
(in.)
(lbs./ft.)
#3
 
0.375
 
0.11
 
1.178
 
0.376
 
#4
 
0.500
 
0.20
 
1.571
 
0.668
 
#5
 
0.625
 
0.31
 
1.963
 
1.043
 
#6
 
0.750
 
0.44
 
2.356
 
1.502
 
#7
 
0.875
 
0.60
 
2.749
 
2.044
 
#8
 
1.000
 
0.79
 
3.142
 
2.670
 
#9
 
1.128
 
1.00
 
3.544
 
3.400
 
#10
 
1.270
 
1.27
 
3.990
 
4.303
 
#11
 
1.410
 
1.56
 
4.430
 
5.313
 
#14
 
1.693
 
2.26
 
5.320
 
7.650
 
#18
 
2.257
 
4.00
 
7.091
 
13.600
 
Typical specification:  ASTM A615 Grade 60 Deformed Bars
Reinforcing Bar Area for Various Bar Spacings (in.^2/ft.)
Spacing
Bar Size
(in.)
#3
#4
#5
#6
#7
#8
#9
#10
#11
3
0.44
0.80
1.24
1.76
2.40
3.16
4.00
5.08
6.24
3-1/2
0.38
0.69
1.06
1.51
2.06
2.71
3.43
4.35
5.35
4
0.33
0.60
0.93
1.32
1.80
2.37
3.00
3.81
4.68
4-1/2
0.29
0.53
0.83
1.17
1.60
2.11
2.67
3.39
4.16
5
0.26
0.48
0.74
1.06
1.44
1.90
2.40
3.05
3.74
5-1/2
0.24
0.44
0.68
0.96
1.31
1.72
2.18
2.77
3.40
6
0.22
0.40
0.62
0.88
1.20
1.58
2.00
2.54
3.12
6-1/2
0.20
0.37
0.57
0.81
1.11
1.46
1.85
2.34
2.88
7
0.19
0.34
0.53
0.75
1.03
1.35
1.71
2.18
2.67
7-1/2
0.18
0.32
0.50
0.70
0.96
1.26
1.60
2.03
2.50
8
0.17
0.30
0.47
0.66
0.90
1.19
1.50
1.91
2.34
8-1/2
0.16
0.28
0.44
0.62
0.85
1.12
1.41
1.79
2.20
9
0.15
0.27
0.41
0.59
0.80
1.05
1.33
1.69
2.08
9-1/2
0.14
0.25
0.39
0.56
0.76
1.00
1.26
1.60
1.97
10
0.13
0.24
0.37
0.53
0.72
0.95
1.20
1.52
1.87
10-1/2
0.13
0.23
0.35
0.50
0.69
0.90
1.14
1.45
1.78
11
0.12
0.22
0.34
0.48
0.65
0.86
1.09
1.39
1.70
11-1/2
0.115
0.21
0.32
0.46
0.63
0.82
1.04
1.33
1.63
12
0.11
0.20
0.31
0.44
0.60
0.79
1.00
1.27
1.56
Tension Development and Splice Lengths for f 'c=3,000 psi and fy=60 ksi
   
Development
Class "B" Splice
Standard 90 deg. Hook
 
 
Bar Size
Top Bar
Other Bar
Top Bar
Other Bar
Embed.
Leg Length
Bend Dia.
 
   
(in.)
(in.)
(in.)
(in.)
(in.)
(in.)
(in.)
 
 
#3
22
17
28
22
6
6
2-1/4
 
 
#4
29
22
37
29
8
8
3
 
 
#5
36
28
47
36
10
10
3-3/4
 
 
#6
43
33
56
43
12
12
4-1/2
 
 
#7
63
48
81
63
14
14
5-1/4
 
 
#8
72
55
93
72
16
16
6
 
 
#9
81
62
105
81
18
19
9-1/2
 
 
#10
91
70
118
91
20
22
10-3/4
 
 
#11
101
78
131
101
22
24
12
 
 
#14
121
93
---
---
37
31
18-1/4
 
 
#18
161
124
---
---
50
41
24
 
 
Notes:
               
 
1. Straight development and Class "B" splice lengths shown in above tables are
 
 
    based on uncoated bars assuming center-to-center bar spacing >= 3*db without
 
 
    ties or stirrups or >= 2*db with ties or stirrups, and bar clear cover >= 1.0*db.
 
 
    Normal weight concrete as well as no transverse reinforcing are both assumed.
 
 
2. Standard 90 deg. hook embedment lengths are based on bar side cover >= 2.5"
 
 
    and bar end cover >= 2" without ties around hook.
     
 
3. For special seismic considerations, refer to ACI 318-05 Code Chapter 21.
 
Tension Development and Splice Lengths for f 'c=4,000 psi and fy=60 ksi
   
Development
Class "B" Splice
Standard 90 deg. Hook
 
 
Bar Size
Top Bar
Other Bar
Top Bar
Other Bar
Embed.
Leg Length
Bend Dia.
 
   
(in.)
(in.)
(in.)
(in.)
(in.)
(in.)
(in.)
 
 
#3
19
15
24
19
6
6
2-1/4
 
 
#4
25
19
32
25
7
8
3
 
 
#5
31
24
40
31
9
10
3-3/4
 
 
#6
37
29
48
37
10
12
4-1/2
 
 
#7
54
42
70
54
12
14
5-1/4
 
 
#8
62
48
80
62
14
16
6
 
 
#9
70
54
91
70
15
19
9-1/2
 
 
#10
79
61
102
79
17
22
10-3/4
 
 
#11
87
67
113
87
19
24
12
 
 
#14
105
81
---
---
32
31
18-1/4
 
 
#18
139
107
---
---
43
41
24
 
 
Notes:
               
 
1. Straight development and Class "B" splice lengths shown in above tables are
 
 
    based on uncoated bars assuming center-to-center bar spacing >= 3*db without
 
 
    ties or stirrups or >= 2*db with ties or stirrups, and bar clear cover >= 1.0*db.
 
 
    Normal weight concrete as well as no transverse reinforcing are both assumed.
 
 
2. Standard 90 deg. hook embedment lengths are based on bar side cover >= 2.5"
 
 
    and bar end cover >= 2" without ties around hook.
     
 
3. For special seismic considerations, refer to ACI 318-05 Code Chapter 21.
 
Tension Development and Splice Lengths for f 'c=5,000 psi and fy=60 ksi
   
Development
Class "B" Splice
Standard 90 deg. Hook
 
 
Bar Size
Top Bar
Other Bar
Top Bar
Other Bar
Embed.
Leg Length
Bend Dia.
 
   
(in.)
(in.)
(in.)
(in.)
(in.)
(in.)
(in.)
 
 
#3
17
13
22
17
6
6
2-1/4
 
 
#4
22
17
29
22
6
8
3
 
 
#5
28
22
36
28
8
10
3-3/4
 
 
#6
33
26
43
33
9
12
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