SectionPro

Mechanical properties

Geometric properties of the uncracked section: area, perimeter, centroid, moments of inertia, extreme fibers, torsion constant and shear areas. Gross, net, or transformed section.

Strains and stresses

Distribution of strains and stresses in concrete and reinforcement. Internal forces with position. Identification of the governing load case.

Reinforcement design

Minimum reinforcement area such that one or more materials reach their critical strain. Pivot A (critical reinforcement) or Pivot B (concrete at ultimate state).

3D interaction surface

N-My-Mz resistance boundary for a given limit state. Configurable mesh density. 3D viewer with rotation, zoom, and transparency.

Verification via interaction surface

Positioning of load cases in N-My-Mz space. Calculation of the distance to the boundary and status identification (admissible, limit, exceeded).

Interaction curve

2D cross-section of the interaction surface at a fixed component. Envelope mode available for quick verification across all load cases.

Design via interaction surface

Minimum reinforcement to place the critical load case on the interaction surface boundary (SF = 1).

Stiffness curves M-χ and N-ε₀

Pushover analysis up to failure. Identification of successive yielding events. EI-M and EA-N curves for equivalent stiffness.

Second-order effects

Simplified EC2 methodology. Moment amplification, critical load, and failure mode (instability or resistance).

Crack width

Calculation of the characteristic crack width wk and maximum crack spacing sr,max according to the Eurocode 2 methodology.

Fire analysis

Transient thermal field (isotherms) and thermo-mechanical verification using the 500 °C isotherm.