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Masonry Design

Reinforced Masonry Rebar Splice and Development Length

Design Code: ACI 530-08, Section 2.1.9.3 equaion (2-12) (ACI 530-05 also apply)

Splice and development length of rebar

Ld = 0.13*db2*fy*g / (K*Öf'm)      ³ 12"      (ACI 530-08, Eq. 2-12)

Where db is diameter of rebar, fy is yield strength of rebar, f'm is compressive strength of masonry.

K is smaller of 5db, minimum cover of rebar, and spacing between rebar lap, and

 g = 1, for #5 bar or smaller, 1.3 for #6 and #7 bar, 1.5 for #8 to #11 bar.

Splice and development length of rebar in 8 inches concrete masonry (inches) (fy = 40000 psi)

Width of masonry wall (in)

7.625

7.625

7.625

7.625

7.625

7.625

7.625

7.625

7.625

Yield strength of rebar fy (psi)

40000

40000

40000

40000

40000

40000

40000

40000

40000

Bar size

#3

#4

#5

#6

#7

#8

#9

#10

#11

Bar diameter db (in)

0.375

0.5

0.625

0.75

0.875

1

1.128

1.27

1.41

K = 5db or mini concrete cover

1.88

2.50

3.13

3.44

3.38

3.31

3.25

3.18

3.11

g

1

1

1

1.3

1.3

1.5

1.5

1.5

1.5

Compressive strength of masonry f'm (psi)

 

 

 

 

 

 

 

 

 

1350

12

14

18

30

42

64

83

108

136

1500

12

13

17

29

40

61

79

102

129

2000

12

12

15

25

34

53

68

89

112

2500

12

12

13

22

31

47

61

79

100

3000

12

12

12

20

28

43

56

72

91

Splice and development length of rebar in 8 inches concrete masonry (inches) (fy = 60000 psi)

Width of masonry wall (in)

7.625

7.625

7.625

7.625

7.625

7.625

7.625

7.625

7.625

Yield strength of rebar fy (psi)

60000

60000

60000

60000

60000

60000

60000

60000

60000

Bar size

#3

#4

#5

#6

#7

#8

#9

#10

#11

Bar diameter db (in)

0.375

0.5

0.625

0.75

0.875

1

1.128

1.27

1.41

K = 5db or mini concrete cover

1.88

2.50

3.13

3.44

3.38

3.31

3.25

3.18

3.11

g

1

1

1

1.3

1.3

1.5

1.5

1.5

1.5

Compressive strength of masonry f'm (psi)

 

 

 

 

 

 

 

 

 

1350

16

21

27

45

63

96

125

162

204

1500

15

20

25

43

59

91

118

153

193

2000

13

17

22

37

51

79

102

133

167

2500

12

16

20

33

46

71

92

119

150

3000

12

14

18

30

42

64

84

108

137

Splice and development length of rebar in 12 inches concrete masonry (inches) (fy = 40000 psi)

Width of masonry wall (in)

11.625

11.625

11.625

11.625

11.625

11.625

11.625

11.625

11.625

Yield strength of rebar fy (psi)

40000

40000

40000

40000

40000

40000

40000

40000

40000

Bar size

#3

#4

#5

#6

#7

#8

#9

#10

#11

Bar diameter db (in)

0.375

0.5

0.625

0.75

0.875

1

1.128

1.27

1.41

K = 5db or mini concrete cover

1.88

2.50

3.13

3.75

4.38

5.00

5.25

5.18

5.11

g

1

1

1

1.3

1.3

1.5

1.5

1.5

1.5

Compressive strength of masonry f'm (psi)

 

 

 

 

 

 

 

 

 

1350

12

14

18

28

32

42

51

66

83

1500

12

13

17

26

31

40

49

63

78

2000

12

12

15

23

26

35

42

54

68

2500

12

12

13

20

24

31

38

49

61

3000

12

12

12

19

22

28

35

44

55

Splice and development length of rebar in 12 inches concrete masonry (inches) (fy = 60000 psi)

Width of masonry wall (in)

11.625

11.625

11.625

11.625

11.625

11.625

11.625

11.625

11.625

Yield strength of rebar fy (psi)

60000

60000

60000

60000

60000

60000

60000

60000

60000

Bar size

#3

#4

#5

#6

#7

#8

#9

#10

#11

Bar diameter db (in)

0.375

0.5

0.625

0.75

0.875

1

1.128

1.27

1.41

K = 5db or mini concrete cover

1.88

2.50

3.13

3.75

4.38

5.00

5.25

5.18

5.11

g

1

1

1

1.3

1.3

1.5

1.5

1.5

1.5

Compressive strength of masonry f'm (psi)

 

 

 

 

 

 

 

 

 

1350

16

21

27

41

48

64

77

99

124

1500

15

20

25

39

46

60

73

94

118

2000

13

17

22

34

40

52

63

82

102

2500

12

16

20

30

35

47

57

73

91

3000

12

14

18

28

32

43

52

67

83