Reinforced-concrete beam and column design with P-M interaction, biaxial bending and crack-width — IS 456, ACI 318, Eurocode 2.
Design rectangular and circular reinforced-concrete sections for combined axial load, bending and shear. Plot P-M interaction diagrams, check biaxial bending per Bresler, run crack-width and serviceability checks, and export a code-referenced report.
Generate full interaction diagrams for rectangular, circular and L-shaped sections — point load + biaxial bending in one chart.
Bresler reciprocal load equation evaluated automatically for column sections with moments about both axes.
Crack width to IS 456 Annex F, ACI 318 Eq. 24.3.2 and EC2 §7.3 — same section, three answers, your call.
The tool finds the lightest bar arrangement that meets ductility, spacing and cover constraints.
Width, depth (or diameter), cover, bar grade, and concrete grade. Rectangular, circular or T/L sections.
Axial force, bending moment about either axis, and shear. Combine via standard load combinations or enter directly.
Flexure, shear, axial, biaxial bending, ductility and serviceability — code-specific factors applied automatically.
Drag the load point on an interactive interaction diagram; export the section sheet to PDF.
Heavy axial + biaxial moment from wind/seismic — the P-M-M envelope identifies governing combination.
Flange in compression at midspan, rectangular at supports — the tool switches automatically.
Tight crack-width limits to IS 3370 — bar spacing and stress are tuned automatically.
Reverse-engineer a section from an existing drawing and check capacity for revised loads.
Three engineering cases with the inputs and expected results. Open one to see exactly what to type into the calculator.
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