Clasification Society Rulefinder 2020 - Version 9.33 - Fix
Common Structural Rules - Common Structural Rules for Bulk Carriers and Oil Tankers, January 2019 - Part 1 General Hull Requirements - Chapter 9 Fatigue - Section 1 General Considerations - 7 Load Cases

7 Load Cases

7.1 Assumptions

7.1.1 The load cases to be considered for fatigue assessment are given in Ch 4, Sec 2, [3].

The design load scenario for fatigue assessment is defined in Ch 4, Sec 7, Table 3.

For each loading condition defined in [6], all fatigue load cases are to be considered to generate the combination of dynamic loads for fatigue assessment.

7.1.2 Predominant load case

The predominant load case for each loading condition (j) is defined as load case where the fatigue stress range for the critical location is the maximum among all fatigue load cases.

Table 2 : Loading conditions for bulk carriers

Ship type

 Fullload condition Ballast condition
Homogeneous Alternate Normal ballast Heavy ballast
BC-A X X X X
BC-B X - X X
BC-C X - X X

Table 3 : Fraction of time for each loading condition of bulk carriers

Ship length Loading conditions α(j)
BC-A BC-B,BC-C

L<200 m

Homogeneous 0.60 0.70
Alternate 0.10 -
Normal ballast(1) 0.15 0.05
Heavy ballast(1) 0.15 0.25

L≥200m

Homogeneous 0.25 0.50
Alternate 0.25 -
Normal ballast 0.20 0.20
Heavy ballast 0.30 0.30
(1) For BC-B and BC-C without heavy ballast cargo hold, fraction of time α(j) for normal ballast is 0.30 and for heavy ballast 0.
Parent topic: Section 1 General Considerations
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