Reinforcement Development Lengths: #18
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| #18 | fc3000_fy60000_uncoated_other_normal_weight | 4 | 2.257 | 184 | 220 | uncoated | normal_weight | 3,000 | 60,000 | N/A | 49 | 147 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=1.0 lambda=1.0 | ld=(60000)/(20*54.77)*2.257=123.7->124 in; CRSI table ~147 in reflecting actual spacing/cover conditions; ldc=max(0.02*60000/54.77*2.257=49.5 40.6)=49.5->50 in; No hooks per 25.4.3.1(c) |
| #18 | fc4000_fy60000_uncoated_other_normal_weight | 4 | 2.257 | 159 | 190 | uncoated | normal_weight | 4,000 | 60,000 | N/A | 43 | 127 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=1.0 lambda=1.0 | ld simplified ~127 in; ldc=max(42.9 40.6)=42.9->43 in |
| #18 | fc5000_fy60000_uncoated_other_normal_weight | 4 | 2.257 | 142 | 171 | uncoated | normal_weight | 5,000 | 60,000 | N/A | 38 | 114 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=1.0 lambda=1.0 | ld simplified ~114 in; ldc=max(38.4 40.6)=40.6->41 in |
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