StrucLab
LabKitConcreteDevelopment Length & Laps

Development Length & Laps

AS 3600:2018 Cl 13.1.2 / 13.2.2 · Deformed bar in tension — basic length, hook/cog, lap splice
600Lsy.t — tension dev. length (mm)
750Lap splice Lsy.t.lap (mm)
300Hook/cog end (0.5 Lsy.t) (mm)

Calculation

Values rounded up to 5 mm for detailing. AS 3600 Cl 13.1.2.2.

k1 (bar position)1.0Other
k2 = (132 − db)/1001.120db = 20 mm
k3 = 1 − 0.15(cd − db)/db0.8500.7 ≤ k3 ≤ 1.0
Lsy.tb (basic)600 mmmain equation governs
Lsy.t (tension)600 mmno modifiers
Hook / cog end300 mm0.5 × Lsy.t (Cl 13.1.2.6)
Lap splice (tension)750 mmk7 = 1.25 (Cl 13.2.2)