Reinforcement Development Lengths: #3
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| #3 | fc3000_fy60000_uncoated_other_normal_weight | 0.11 | 0.375 | 15 | 18 | uncoated | normal_weight | 3,000 | 60,000 | 8 | 12 | 12 | other | psi_t=1.0 psi_e=1.0 psi_g=1.0 psi_s=0.8 lambda=1.0 | Min ld=12 in governs; simplified Table 25.4.2.3 for #6&smaller with adequate spacing/cover; ldc=max(8 in calc 9.0 0.0003*fy*db=6.75)=9 in but min=8 governs |
| #3 | fc4000_fy60000_epoxy_other_normal_weight | 0.11 | 0.375 | 15 | 18 | epoxy | normal_weight | 4,000 | 60,000 | 10 | 8 | 12 | other | psi_t=1.0 psi_e=1.5 psi_g=1.0 psi_s=0.8 lambda=1.0 | Epoxy coated with clear spacing<3db or cover<db: psi_e=1.5; product psi_t*psi_e<=1.7; min ld=12 in governs |
| #3 | fc4000_fy60000_uncoated_other_lightweight | 0.11 | 0.375 | 19 | 23 | uncoated | lightweight | 4,000 | 60,000 | 10 | 10 | 15 | 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 increases by 1/0.75=33%; ld=13/0.75=17->17 in |
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