structural / design
Choose the code. Size the section. Check the design.
Select Eurocode or Hong Kong Code, choose concrete or steel, and calculate section properties. Run a scoped resistance check, then revise as needed.
step 3 / jurisdiction
Start with the design code.
Choose the jurisdiction before the material so Eurocode and Hong Kong requirements are never mixed into one confusing list.
Eurocode design
First-generation EN 1992 reinforced-concrete and EN 1993 structural-steel calculation subsets with visible Nationally Determined Parameters.
Concrete · EN 19922 checksSteel · EN 19933 checksOpen Eurocode route HONG KONG CODE4 liveHong Kong Code design
Bounded concrete and steel checks tied to the stated Buildings Department editions and published amendment state.
Concrete Code3 checksSteel Code1 checkOpen Hong Kong routestep 4 / code and material
Choose concrete or steel within the selected code.
Each card below is one unambiguous code-and-material route. Reinforcement is entered as practical bar arrangements such as 4T20 or T20 @ 150 mm, not as a pre-calculated area.
Concrete · EN 1992
Rectangular reinforced-concrete beam checks with declared first-generation Eurocode scope.
- EN 1992 beam flexureEnter the tension-bar count and diameter.
- EN 1992 beam shearEnter longitudinal bars and link legs, diameter, and spacing.
Steel · EN 1993
Scoped cross-section and member-stability checks using designer-verified properties and classifications.
- EN 1993 section resistance
- EN 1993 column flexural buckling
- EN 1993 lateral-torsional bucklingUser-supplied elastic critical moment Mcr.
Concrete Code
Beam and one-way slab checks using buildable reinforcement arrangements and the stated amendment basis.
- RC beam flexureEnter a bar arrangement such as 4T20.
- RC beam shearEnter longitudinal bars and vertical links.
- One-way RC slab flexure and shearEnter principal and secondary bar diameter and spacing.
Steel Code
Fully restrained, low-shear section resistance with explicit exclusions for member stability and interaction.
- Steel section resistanceUse verified section properties and design strength.
step 5 / section and iteration
Vary section properties inside the design loop.
Section geometry is not only a separate reference task. Use it while sizing a member, then bring the revised properties back to the selected code check.
Section-property calculators
Calculate the properties required by the resistance tools without leaving the structural-design route.
Open the complete section-property hubrepeat as required
Analysis → section → code check → revision.
- 01Analyse the actions
Obtain design moments, shears, and axial forces from a suitable model and combination basis.
- 02Choose dimensions and reinforcement
Calculate geometric properties or enter a practical bar arrangement.
- 03Run the selected code check
Confirm every input, validity gate, source edition, and excluded check.
- 04Revise and repeat
Change the section or reinforcement, then recalculate until all required checks are complete.
For early sizing, the code-neutral RC capacity screen and required-reinforcement screen remain available. They do not replace a Eurocode or Hong Kong Code design.
Every live code tool is a declared subset, not a complete design. Loading combinations, interaction, serviceability, durability, fire, detailing, connections, omitted stability modes, and professional review remain separate unless the tool explicitly includes them.