British Standard BS 6349
Although BS 6349 part 1 [3.23] and part 2 [3.42] comply with EN 1990, they do not specify specific reliability classes. In appendix A of BS 6349 part 2, the limit states and the partial load factors are given. In addition to the load factors, the load combinations and the combination factors, as mentioned in EN 1990, extra factors are added in BS 6349 part 2 for the type of loads and loading conditions that are not addressed in EN 1990, among which are berthing loads and mooring forces.
Table 3-37 Partial factors γ
Q
related to unfavourable variable actions, such as mooring and berthing dolphins for use in BS 6349-2.Variable actions | EQU (Set A) | STR/GEO (Set B) | STR/GEO (Set C) |
Wind loads (persistent) | 1.3 | 1.3 | 1.3 |
Water current loads (persistent) | 1.4 | 1.4 | 1.3 |
Wave loading (persistent) | 1.4 | 1.4 | 1.3 |
Ship berthing loads (persistent) | 1.4 | 1.4 | 1.3 |
Mooring loads (persistent) | 1.5 | 1.5 | 1.3 |
Abnormal berthing (transient) | 1.2 | 1.2 | 1.2 |
Combination factors according to BS 6349-2-2010:
Table 3-38 ψ factors for combinations related to mooring and berthing loads, where: ψ
0
= Factor for the combination value of a variable action; ψ1
= Factor for the frequent value of a variable action; ψ2
= Factor for the quasi permanent value of a variable action.Action | ψ 0 | ψ 1 | ψ 2 | |
Environmental loads | Wind loads | 0.6 | 0.2 | - |
Hydrostatic loads (excluding ground water effects) | 0.7 | 0.5 | 0.3 | |
Water current loads | 0.6 | 0.2 | - | |
Wave loading | 0.6 | 0.2 | - | |
Ship and mooring loads | Ship berthing loads | 0.75 | 0.75 | - |
Mooring loads | 0.6 | 0.2 | - | |
Forces from ship propulsion | 0.75 | 0.75 | - | |
Earth and ground water pressures | 1.0 | 1.0 | 1.0 |