DEVELOPMENT AND SPLICE LENGTH CALCULATION FOR ACI-318 08

#3 #4 #5 #6 #7 #8 #9 #10 #1 0 #11 #1 1

75mm 75mm 100mm 100mm 150mm 150mm 200mm 250m 25 0mm m 250m 25 0mm m

360 mm 480 mm 600 mm 710 mm 1030 mm 1170 mm 1320 mm 1460 mm 1610 mm

470 mm 620 mm 770 mm 930 mm 1330 mm 1520 mm 1710 mm 1900 mm 2090 mm

360 mm 480 mm 600 mm 710 mm 1030 mm mm 1170 mm mm 1320 mm mm 1460 mm mm 1610 mm mm

470 mm 620 mm 770 mm 930 mm 1330 mm 1520 mm 1710 mm 1900 mm 2090 mm

470 mm 620 mm 770 mm 930 mm 1330 mm 1520 mm 1710 mm 190 1900 mm 209 2090 mm

600 mm 180 mm 310 mm 800 mm 240 mm 380 mm 1000 mm 300 mm 470 mm 1200 mm 360 mm 560 mm 1730 mm 420 mm 660 mm 1980 mm 480 mm 750 mm 2220 mm 540 mm 840 mm 2470 470 mm 600 mm 940 mm 2710 710 mm 660 mm 1030 mm

No.6 and smaller bars and deformed wires

Clear spacing of bars or wires being developed or spliced not less than d b, clear cover not less than db, and stirrups or ties throughout ld not less than the code minimum. or Clear spacing of bars or wires being developed or spliced not less than 2d b and clear cover not less than db. other cases

fy*a*b*db 2.1*λ*√f'c

fy*a*b*l*db 1.4√f'c

Using clause of Sec 12.2.1, ld shall not be less than 300mm. For top bars: a=

b=

1.3 1.5 1.2 1.0

λ=

1.0

For other bars: 1.0 a= 1.5 1.2 1.0 b= λ =

1.0

Splice = = =

ldc =

(Sec 12.2.4(a)) (for epoxy-coated bars or wires with cover <3db, or clear spacing <6db) (for all other epoxy-coated bars or wires) (for uncoated reinforcement) 1.7 but,  a*b ≤ (for normal weight concrete)

(Sec 12.2.4(a)) (for epoxy-coated bars or wires with cover <3db, or clear spacing <6db) (for all other epoxy-coated bars or wires) (for uncoated reinforcement) 1.7 but, a*b ≤ (for normal weight concrete)

1.0 * ld 1.3 * ld 300 mm

(for Class A splice) (for Class B splice) (minimum splice length)

0.24*fy*db λ*√f'c

Splice Spli ce = 0.071*fy 0.071*fy*db *db = (0.13*fy-24)*db = 300 mm

ldh =

0.24*ψe*fy*db

(fy ≤ 420 MPa) (fy > 420 MPa) (minimum splice length)

(shall not be less than 8db and 150mm)

λ*√f'c

ψe = λ= f'c = fy =

1.0 1.0 28 413

Sec 12.5.3(a):

(for uncoated Grade60 Bars) (for normal weight concrete) MPa MPa 1.0

(Applicable modification factor)

180 mm 240 mm 300 mm 360 mm 420 mm 480 mm 540 mm 600 mm 660 mm

No.7 and larger bars

fy*a*b*db 1.7*λ*√f'c

3fy*a*b*l*db 1.1√f'c