Code constants in this tool are transcribed from the Standard and marked for verification.
Check codes.py against your copy of AS 5100.5 before using results for design.
Project
Used to name saved files and to head the calculation sheet.
Section file
Saves everything on this page as a .json file.
Concrete
Geometry
Click the section view to add points, drag to move, right-click to delete.
Points trace the outline in order.
Paste coordinates
One point per line as x, y — tabs, commas or spaces.
Pastes straight from a spreadsheet.
Reinforcement
Bars and tendons are normally required to sit inside the section and
outside any void — a mistyped x coordinate otherwise gives a plausible
but wrong capacity. Tick only if you meant it.
Prestress
Voids
Holes punched through the section — a box girder cell, a duct.
x and y are the centre of the void. A void must lie inside the outline.
Design actions
Calculation sheet
Full working with formulae, substitutions and clause references.
Headed with the project details above.
Shear & torsion
Torsion ties (used when T* > 0)
Ultimate flexural capacity
– kNm φMuo
First-principles response (fibre model)
– kNm peak M
Moment–curvature at constant N*. Markers: cracking,
first yield, peak, ultimate.