Reinforcement Development Lengths: #8
ACI 318-19 reinforcement development and splice lengths for deformed bars #3 through #18. Includes tension development length ld, compression development length ldc, Class A and B splice lengths, and standard hook development length ldh. Covers f'c = 3000-6000 psi, fy = 60000 and 80000 psi, uncoated and epoxy-coated bars, top and other bars, and normal-weight vs lightweight concrete.
| bar size | condition key | bar area in2 (in2) | bar diameter in (in) | class A splice in (in) | class B splice in (in) | coating | concrete type | fc psi (psi) | fy psi (psi) | hook development ldh in | ld compression in (in) | ld tension in (in) | location | modification factors applicable | notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| #8 | fc3000_fy60000_uncoated_other_normal_weight | 0.79 | 1 | 50 | 60 | uncoated | normal_weight | 3,000 | 60,000 | 15 | 19 | 40 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=1.0 lambda=1.0 | ld simplified (good cover/spacing) ~40 in; ldc=max(0.02*60000/54.77*1.0=21.9 18.0)=21.9->22 in |
| #8 | fc4000_fy60000_epoxy_other_normal_weight | 0.79 | 1 | 66 | 79 | epoxy | normal_weight | 4,000 | 60,000 | 16 | 16 | 53 | other | psi_t=1.0 psi_e=1.5 psi_g=1.0 psi_s=1.0 lambda=1.0 | Epoxy psi_e=1.5; ld=35*1.5=52.5->53 in; ldh psi_e=1.2 |
| #8 | fc4000_fy60000_uncoated_other_lightweight | 0.79 | 1 | 58 | 70 | uncoated | lightweight | 4,000 | 60,000 | 17 | 21 | 47 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=1.0 lambda=0.75 | Lightweight concrete lambda=0.75; ld=35/0.75=46.7->47 in |
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