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Calculation Basis
Assumptions & Limits
- Preset values speed up the setup but do not replace final section or material verification.
- The page is designed for fast deflection and reaction checks.
- Local code rules, long-term effects, and connection details still need separate review.
Reference Basis
- Documentation: Methodology
- Documentation: Engineering Review
- Roark's Formulas for Stress and Strain
- Mechanics of Materials references
S355JR Material Reference
| Material grade | S355JR structural steel |
| Elastic modulus E | 210 GPa |
| Yield strength fy | 355 MPa |
| Typical density | 7850 kg/m^3 |
| Preset support case | Simply supported beam |
| Preset loading | Uniform load |
| Preset section stiffness I | 3200 cm^4 |
Engineering Notes
- For serviceability checks, S355JR uses essentially the same elastic modulus as standard S235 structural steel, so the beam stiffness still depends mainly on section geometry.
- Use this page when the steel grade is fixed before the exact profile has been selected.
- If the project is strength-driven, the higher yield level matters; if it is deflection-driven, changing the section geometry usually has more effect than changing between S235 and S355JR.
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