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Calculation Basis
Assumptions & Limits
- The page supports preliminary checks but does not replace full code compliance review.
- Allowable limits remain project-specific and must be checked separately.
- Elastic modulus, inertia, and loading inputs must match the real member.
Reference Basis
- Documentation: Methodology
- Documentation: Engineering Review
- Roark's Formulas for Stress and Strain
- Mechanics of Materials references
- Eurocode 5 timber reference
Validation Examples
These check cases show how key pages compare against known elastic beam benchmarks or symmetric reference cases.
Timber serviceability benchmark
Case setup
L = 4.8 m, w = 2.4 kN/m, E = 11 GPa, I = 7119 cm^4
Validated metric
Maximum deflection
Reference
Reference result: 21.18 mm
Calculator
Calculator result: 21.18 mm
Check
Difference: 0.00%
Benchmark: closed-form simple-span UDL formula
Eurocode 5 Timber Setup
| Material basis | Typical C24 timber stiffness level |
| Common use | Floors, joists, rafters, and light roof beams |
| Typical first check | Serviceability deflection under full-span load |
| Current preset section | 75 x 225 mm style timber member |
| Useful follow-up | Compare with project-specific deflection limit |
| Current preset | 4.8 m timber beam under 2.4 kN/m |
Engineering Notes
- This page is intended for Eurocode 5 style preliminary timber beam checks, especially when the first design question is whether serviceability is in range before deeper material and creep adjustments are applied.
- For timber beams, long-term behavior matters more than for steel, so instantaneous elastic output should be treated as the first layer rather than the full answer.
- Once the rough beam size is known, continue with the timber span page or compare the response against your governing deflection criterion.
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