Reinforcement Development Lengths: #11
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| #11 | fc3000_fy60000_uncoated_other_normal_weight | 1.56 | 1.41 | 72 | 87 | uncoated | normal_weight | 3,000 | 60,000 | 24 | 27 | 58 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=1.0 lambda=1.0 | ld simplified ~58 in; ldc=max(0.02*60000/54.77*1.41=30.9 25.4)=30.9->31 in |
| #11 | fc4000_fy60000_epoxy_other_normal_weight | 1.56 | 1.41 | 94 | 113 | epoxy | normal_weight | 4,000 | 60,000 | 25 | 23 | 75 | 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=50*1.5=75 in; ldh psi_e=1.2 |
| #11 | fc4000_fy60000_uncoated_other_normal_weight | 1.56 | 1.41 | 63 | 75 | uncoated | normal_weight | 4,000 | 60,000 | 21 | 23 | 50 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=1.0 lambda=1.0 | ld simplified ~50 in; ldc=max(26.7 25.4)=26.7->27 in |
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