Reinforcement Development Lengths: #5
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| #5 | fc3000_fy60000_uncoated_other_normal_weight | 0.31 | 0.625 | 24 | 29 | uncoated | normal_weight | 3,000 | 60,000 | 9 | 11 | 19 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=0.8 lambda=1.0 | ld=(60000*0.8)/(25*54.77)*0.625=21.9->22 in; ldc=max(0.02*60000/54.77*0.625=13.7 0.0003*60000*0.625=11.25)=13.7->14 in |
| #5 | fc4000_fy60000_epoxy_other_normal_weight | 0.31 | 0.625 | 32 | 38 | epoxy | normal_weight | 4,000 | 60,000 | 11 | 10 | 26 | other | psi_t=1.0 psi_e=1.5 psi_g=1.0 psi_s=0.8 lambda=1.0 | Epoxy psi_e=1.5; ld=19*1.5=28.5->29 in; ldh with psi_e=1.2 |
| #5 | fc4000_fy60000_uncoated_other_lightweight | 0.31 | 0.625 | 29 | 35 | uncoated | lightweight | 4,000 | 60,000 | 11 | 13 | 23 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=0.8 lambda=0.75 | Lightweight concrete lambda=0.75; ld=17/0.75=22.7->23 in |
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