Notes

1. This module adopts the Basic Development length simplified method under clause 13.1.2.2 of AS3600-2018(A1).
2. "cd" is defined in figure 13.1.2.2 or 13.2.2. In simplest terms, it represents the minimum of clear reinforcement cover, half bar spacing, and distance between rebar layers.
3. "Sb" is lapped bars spacing within the lap zone. Typically half of your reinforcement spacing. This applies when we have narrow elements like beam webs and columns.
4. The Basic development length multiplier is defined under clause 13.1.2.2, divided by the bar diameter, to give an idea of how much diameter we multiply for and compare with the old rule of 50 Dia, etc.
5. The Lower bound development length multiplier is nothing but 0.058f*ys*k1. This is generally the absolute minimum.
6. "K1" should be 1.3 for horizontal bars with more than 300 mm of concrete underneath; otherwise, take it as 1.
7. "K2" = (132-dia)/100.
8. "K3" = 1 - 0.15(cd-dia)/dia, within the limits of 0.7 and 1 (both values included in the limits).
9. "K7" shall be taken as 1.25; otherwise, see clause 13.2.2 for possible concessions.