Reinforcement Development Lengths: #7
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| #7 | fc3000_fy60000_uncoated_other_normal_weight | 0.6 | 0.875 | 46 | 54 | uncoated | normal_weight | 3,000 | 60,000 | 13 | 16 | 36 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=1.0 lambda=1.0 | #7+ use larger formula ld=(60000*1.0)/(20*54.77)*0.875=47.9->48 in; but simplified Table gives ~36 in for good cover/spacing; ldc=max(0.02*60000/54.77*0.875=19.1 15.75)=19.1->20 in |
| #7 | fc4000_fy60000_epoxy_other_normal_weight | 0.6 | 0.875 | 58 | 69 | epoxy | normal_weight | 4,000 | 60,000 | 14 | 14 | 46 | 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=31*1.5=46.5->47 in; ldh psi_e=1.2 |
| #7 | fc4000_fy60000_uncoated_other_normal_weight | 0.6 | 0.875 | 39 | 47 | uncoated | normal_weight | 4,000 | 60,000 | 11 | 14 | 31 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=1.0 lambda=1.0 | ld simplified for #7+: (fy)/(20*sqrt(fc))*db=(60000)/(20*63.25)*0.875=41.5->42 in; or simplified Table ~31 in; ldc=max(0.02*60000/63.25*0.875=16.6 15.75)=16.6->17 in |
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