Common Structural Rules - Common Structural Rules for Bulk Carriers and Oil Tankers, January 2019 - Part 1 General Hull Requirements - Chapter 6 Hull Local Scantling - Section 4 Plating - 1 Plating Subjected to Lateral Pressure
1 Plating Subjected to Lateral Pressure
1.1 Yielding check
1.1.1 Plating The net thickness, t in mm, is not to be taken less than the greatest value for all applicable design load sets, as defined in Ch 6, Sec 2, [2.1.3], given by:
where:
, not to be taken greater than Ca-max.
β : Coefficient as defined in Table 1.
α : Coefficient as defined in Table 1.
Ca-max : Maximum permissible bending stress coefficient as defined in Table 1.
Table 1 : Definition β, α and Ca-max
| Acceptance criteria set | Structural member | β | α | Ca-max | |
| AC-S | Longitudinal strength members | Longitudinally stiffened plating | 0.9 | 0.5 | 0.8 |
|
Transversely stiffened plating |
0.9 |
1.0 |
0.8 |
||
| Other members | 0.8 | 0 | 0.8 | ||
| AC-SD | Longitudinal strength members | Longitudinally stiffened plating | 1.05 | 0.5 | 0.95 |
|
Transversely stiffened plating |
1.05 |
1.0 |
0.95 |
||
| Other members | 1.0 | 0 | 1.0 | ||
1.2 Plating of corrugated bulkheads
1.2.1 Cold, hot formed and built up corrugations
The net thicknesses, t in mm, of the web and flange plates of corrugated bulkheads are not to be taken less than the greatest value calculated for all applicable design load sets, as defined in Ch 6, Sec 2, [2.1.3], given by:
where:
- bp = a for flange plating, in mm, as defined in Ch 3, Sec 6, Figure 21.
- bp = c for web plating, in mm, as defined in Ch 3, Sec 6, Figure 21.
-
For acceptance criteria set AC-S for transverse corrugated bulkheads and vertically corrugated longitudinal bulkheads.
CCB = 0.75
-
For acceptance criteria set AC-SD for transverse corrugated bulkheads and vertically corrugated longitudinal bulkheads.
CCB = 0.90
-
For horizontally corrugated longitudinal bulkheads, without being greater than CCB-max.
βCB : Coefficient as defined in Table 2.
αCB : Coefficient as defined in Table 2.
CCB-max : Maximum permissible bending stress coefficient as defined in Table 2.
Table 2 : Definition βCB, αCB and CCB-max
| Acceptance criteria set |
Structural member |
βCB | αCB | CCB-max |
| AC-S | Horizontally corrugated longitudinal bulkheads | 0.90 | 0.50 | 0.75 |
| AC-SD | Horizontally corrugated longitudinal bulkheads | 1.05 | 0.50 | 0.90 |
1.2.2 Built-up corrugations
For built-up corrugations, with flange and web plate of different thickness, the net thickness, t1 in mm, is to be taken as the greatest value calculated for all applicable design load sets, as defined in Ch 6, Sec 2, [2.1.3] given by:
where:
t1 : Net thickness of the thicker plating, either flange or web, in mm.
t2 : Net thickness of the thinner plating, either flange or web, in mm.
bP : Breadth of thicker plate, either flange or web, in mm.
CCB : Permissible bending stress coefficient as defined in [1.2.1].
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