8/19/2019 Lap & Splice Lengths ACI 318-02

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Bar Development and Splice LengthsPer ACI 318-02 Tension

f'c = 5000 psi Not lightweight, no coating

!" = #0000 psi

Bar Development Length

$$ All % &As re(ire) * As pro+i)e), (t not less than 300$$

Bar Dia 1 1 (top) 2 2 (top) 3 3 (top)10 300 300 350 .50 500 /00

12 300 350 .00 550 #00 800

16 350 .50 550 /00 850 1,100

20 500 #50 850 1,100 1,300 1,/00

22 550 /50 50 1,200 1,.00 1,800

25 #50 850 1,100 1,.00 1,#00 2,100

28 /00 50 1,200 1,#00 1,800 2,300

32 800 1,100 1,.00 1,800 2,000 2,#00

36 00 1,200 1,500 2,000 2,300 3,000

0 1,000 1,300 1,/00 2,200 2,500 3,300

Lap Splice Length

  e(ires As pro+i)e) = 2% As re(ire) or $a% one-half ars

)e+elope) in lap length

$$

Bar Dia 1 1 (top) 2 2 (top) 3 3 (top)

10 300 350 .50 #00 /00 00

12 350 .50 550 /00 800 1100

16 .50 550 /00 50 1100 1.00

20 #50 00 1100 1500 1/00 2200

22 /50 50 1200 1#00 1800 2.00

25 850 1100 1.00 1800 2100 2/00

28 50 1200 1#00 2000 2300 300032 1100 1.00 1800 2300 2/00 3500

36 1200 1#00 2000 2#00 3000 300

0 1300 1/00 2200 200 3300 .300

!oo" Length

Bar Dia

10 200 engths are ro(n)e) (p to nearest 50$$ for less

12 200 than one $eter, an) nearest 100 $$ for $ore than

16 300 one $eter In ro(n)ing - lengths short of calc(late)

20 350 " less than 24 are accepte)

22 .00

25 .5028 500

32 550

36 #00

0 /00

)ia = 6# = 1$$ )ia 6# = 1$$

1 l) = &f"*f'c70508&3*.025) l) = &f"*f'c705&3*.025)

2 l) = &f"*f'c705&1*25) l) = &f"*f'c705&1*20)

3 l) = &f"*f'c705&3*50) l) = &f"*f'c705&3*.0)

 All 9top9 = % 13 :oo; All = &f"*f'c705002)

1< Co+er = 2) clear spcg = .)

2< Co+er = ), and clear spcg = ) with stirr(ps or clear spcg = 2)

3< >ther 

T#pe $ = sa$e as )e+elop$ent length in tale ao+e

T#pe B = 9other9 = 13 % )e+elop$ent lengths ao+e as follows

8/19/2019 Lap & Splice Lengths ACI 318-02

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Bar Development and Splice LengthsPer ACI 318-02 Tension

f'c = 5000 psi Not lightweight, no coating

!" = #0000 psi

Bar Development Length

 All % &As re(ire) * As pro+i)e), (t not less than 129

Bar %o& 1 1 (top) 2 2 (top) 3 3 (top)

3 8 10 13 1/ 1 25

10 13 1/ 22 25 33

5 13 1/ 21 28 32 .1

6 1 25 32 .1 .8 #2

' 22 2 3/ .8 5# /2

8 25 33 .2 55 #. 83

2 3/ .8 #2 /2 3

10 32 .1 53 # 80 103

11 35 .# 58 /# 88 11.

1 .5 58 /. / 111 1.518 5/ /. 5 12. 1.3 18#

Lap Splice Length

  e(ires As pro+i)e) = 2% As re(ire) or $a% one-half ars

)e+elope) in lap length

Bar Dia 1 1 (top) 2 2 (top) 3 3 (top)

3 10 13 1/ 22 25 32

13 1/ 22 2 33 .3

5 1/ 22 28 3# .1 5.

6 25 32 .1 5. #2 81' 2 38 .8 #3 /2 .

8 33 .3 55 /2 83 108

3/ .8 #2 81 3 121

10 .1 5. # 0 103 13.

11 .# 5 /# 11. 1.8

1 58 /5 / 125 1.5 188

18 /. / 12. 1#1 18# 2.2

!oo" Length

Bar Dia

3 #

85 11

6 13

' 15

8 1/

1

10 21

11 23

1 30

18 38

)ia = 6# )ia 6#

1< Co+er = 2) clear spcg = .)

2< Co+er = ), and clear spcg = ) with stirr(ps or clear spcg = 2)

3< >ther 

T#pe $ = sa$e as )e+elop$ent length in tale ao+e

T#pe B = 9other9 = 13 % )e+elop$ent lengths ao+e as follows

8/19/2019 Lap & Splice Lengths ACI 318-02

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1 l) = &f"*f'c70508&3*.025) l) = &f"*f'c705&3*.025)

2 l) = &f"*f'c705&1*25) l) = &f"*f'c705&1*20)

3 l) = &f"*f'c705&3*50) l) = &f"*f'c705&3*.0)

 All 9top9 = % 13 :oo; All = &f"*f'c705002)