Rule-minimum midship section modulus from total bending moment (SWBM + WBM) and the allowable stress per IACS UR S11.
Formula
$$ Z_{req} = \frac{M_{SW} + M_W}{\sigma_{allow}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $M_{SW}$ | Still-water BM | kN·m | loading computer |
| $M_W$ | Wave BM | kN·m | IACS UR S11 |
| $\sigma_{allow}$ | Allowable nominal stress | N/mm² | IACS S11 |
Sources
- IACS UR S11 Rev.12.