Reinforcement Development Lengths: #4
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| #4 | fc3000_fy60000_uncoated_other_normal_weight | 0.2 | 0.5 | 19 | 23 | uncoated | normal_weight | 3,000 | 60,000 | 8 | 10 | 15 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=0.8 lambda=1.0 | ld=60000*1.0/(25*54.77)*0.5*0.8=17.5->rounded up=18 but simplified Table gives 15; using simplified clear spacing>=db and cover>=db |
| #4 | fc4000_fy60000_epoxy_other_normal_weight | 0.2 | 0.5 | 25 | 30 | epoxy | normal_weight | 4,000 | 60,000 | 10 | 8 | 20 | 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=60000*1.5*0.8/(25*63.25)*0.5=22.7->23 in |
| #4 | fc4000_fy60000_uncoated_other_normal_weight | 0.2 | 0.5 | 17 | 20 | uncoated | normal_weight | 4,000 | 60,000 | 8 | 8 | 13 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=0.8 lambda=1.0 | ld simplified=(60000*0.8)/(25*63.25)*0.5=15.1->13 in; ldc=max(0.02*60000/63.25*0.5=9.5 8)=9.5->10 in min |
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