Deck section modulus Z_d = I / y_d - governs bending stress in compression at the deck for a sagging wave.
Formula
$$ Z_d = \frac{I}{y_d}, \quad Z_k = \frac{I}{y_k} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $I$ | Hull-girder moment of inertia | m⁴ | structural calc |
| $y_d, y_k$ | Distances from neutral-axis | m | cross-section |
| $Z$ | Section modulus at deck / keel | m³ | result |
Sources
- IACS CSR-H.