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a- Tension Development Length Calculations According ACI 12.2:

fy 420 N/mm2

fc' 35 N/mm2

t 1.3 For Top bars (Min. 300mm concrete Cast below), ACI 12.2.4

1.0 For others, ACI 12.2.4

e 1.0 For uncoated and zinc-coated (galvanized) reinforcement,, ACI 12.2.4

1.0 For normalweight concreteLd for Bars dia 20 mm :

Ld= ACI 12.2.2

= 54.3 d For Top bars (Min. 300mm concrete Cast below), ACI 12.2.4

= 41.8 d For others, ACI 12.2.4

b- Compression Development Length Calculations According ACI 12.3:

= 17.0 d ACI 12.3.2

= 18.1 d ACI 12.3.2

= 18.1 d and not less than 200 mm, ACI 12.3.1

c- Tension Development of standard hooks length Calculations According ACI 12.5:

Ldh= = 17.0 d ACI 12.5.2

d- Tension Splice Length Calculations According ACI 12.15:

e- Comperssion Splice Length Calculations According ACI 12.16:

= 29.8 d ACI 12.16.1

= 0.0 d ACI 12.16.1

DEVELOPMENT AND SPLICES OF REINFORCEMENT ACCORDING ACI318M-08, CHAPTER 12

Ldc = max of

and shall not be less than the larger of8db and 150 mm

, ACI 12.5.1

For fy 420 MPa=

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DEVELOPMENT AND SPLICES OF REINFORCEMENT ACCORDING ACI318M-08, CHAPTER 12

Ld Class ASplice= Ld

Class B Splice=1.3Ld

10 338 170 338 439 439 439 571 200 298

12 406 204 406 527 527 527 686 217 358

14 473 239 473 615 615 615 800 253 417

16 541 273 541 703 703 703 914 289 477

18 609 307 609 791 791 791 1028 325 537

20 676 341 676 879 879 879 1143 361 596

25 1044 426 1044 1357 1357 1357 1764 452 746

28 1169 477 1169 1520 1520 1520 1976 506 835

32 1336 545 1336 1737 1737 1737 2258 578 954

Hook Ldh

MINIMUM DEVELOPMENT AND SPLICE LENGTHS (mm)

TENSION COMPRESSION

Ldc SPLICE

Class B

Splice =

1.3Ld

Top bars (Min. 300mm concrete Cast

below)Ld

Class A

Splice = Ld

Bar Size

d(mm)

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