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structural / design / eurocode 2

RC beam design: bending, shear and torsion.

Set the section and reinforcement beside the live section sketch, then review the linked ULS checks.

Design basis must be confirmed

Declared basis: first-generation EN 1992-1-1:2004 + AC:2010 + A1:2014. Confirm the applicable National Annex, design situation, material parameters and project design assumptions before relying on any result.

declared calculation basis

One section model, three linked ULS checks.

The calculator is limited to a rectangular, normal-weight-concrete beam section with bonded reinforcement and the declared first-generation EN 1992-1-1 basis. It derives the rectangular section area and second moment of area from b and h; effective depth follows the entered cover, closed-link diameter, tension-bar diameter and bar arrangement.

Flexure and shear

Flexural resistance uses the rectangular concrete compression block, force equilibrium and lever arm for the entered tension bars. The bottom-bar check also adds the shear-induced longitudinal tension force for vertical links. Shear resistance checks the concrete contribution and the contribution/maximum resistance of the entered vertical links, using the selected code parameters and section geometry.

Torsion and combined shear–torsion

Torsion is represented using the code’s equivalent thin-walled closed-section model. The extra perimeter bars are checked on each wall, with each corner bar allocated half to each adjoining wall; they are not credited to the separate bottom-bar tension check. The check reports the torsional shear-strut limit and the required transverse and longitudinal torsion reinforcement for the declared model. The shear and torsion strut utilizations are checked together; transverse link demand is combined rather than treating the torsion check as an independent pass.

Closed links and longitudinal bars distributed around the section perimeter are required for the torsion model. The displayed section sketch and basic bar-fit warning are geometry aids; they do not replace complete reinforcement detailing checks.

What this calculator does not establish

  • It is not a complete member design or a statement that a beam is safe or code-compliant.
  • It does not perform SLS deflection or crack-width checks, load combinations, anchorage and lap design, full code-compliant bar-spacing/detailing verification, durability, fire, fatigue, seismic, bearing, restraint, or construction checks.
  • It is limited to the stated rectangular singly reinforced flexural model; axial force, compression reinforcement, biaxial bending, prestressing, flanged sections, discontinuity regions and second-order effects are outside scope.
  • Project-specific National Annex choices and all design actions must be independently established and confirmed by the responsible engineer.

official source

Check the applicable national publication.

Use the applicable edition of EN 1992-1-1 together with its National Annex. Confirm the calculation assumptions, clauses, material factors and detailing requirements against the project design basis.