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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
Long-Term RC Reference Setup
| System type | Reinforced concrete beam |
| Model basis | Reduced effective stiffness estimate |
| Preset effective modulus | 12 GPa |
| Preset effective inertia | 25000 cm^4 |
| Preset support case | Simply supported beam |
| Preset loading | Uniform sustained load |
| Use case | Preliminary long-term serviceability check |
Engineering Notes
- This page is not a full long-term reinforced concrete deflection model with cracking evolution, creep coefficients, shrinkage, tension stiffening, and staged loading.
- It is a simplified reduced-stiffness check for testing whether a long-term serviceability issue is plausible.
- For real design, the effective stiffness and long-term multipliers must be taken from the chosen code method and actual reinforcement/layout assumptions.
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