Reinforcement Development Lengths: #9
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| #9 | fc3000_fy60000_uncoated_other_normal_weight | 1 | 1.128 | 57 | 68 | uncoated | normal_weight | 3,000 | 60,000 | 17 | 22 | 46 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=1.0 lambda=1.0 | ld simplified ~46 in; ldc=max(0.02*60000/54.77*1.128=24.7 20.3)=24.7->25 in |
| #9 | fc4000_fy60000_epoxy_other_normal_weight | 1 | 1.128 | 75 | 90 | epoxy | normal_weight | 4,000 | 60,000 | 18 | 19 | 60 | 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=40*1.5=60 in |
| #9 | fc4000_fy60000_uncoated_other_normal_weight | 1 | 1.128 | 50 | 60 | uncoated | normal_weight | 4,000 | 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 ~40 in; ldc=max(21.4 20.3)=21.4->22 in |
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