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 4 Loads - Section 2 Dynamic Load Cases - 1 General

1 General

1.1 Definition of dynamic load cases

1.1.1 The following Equivalent Design Waves (EDW) are to be used to generate the dynamic load cases for structural assessment:

  • HSM load cases:

    HSM-1 and HSM-2: Head sea EDWs that minimise and maximise the vertical wave bending moment amidships respectively.

  • HSA load cases:

    HSA-1 and HSA-2: Head sea EDWs that maximise and minimise the head sea vertical acceleration at FP respectively.

  • FSM load cases:

    FSM-1 and FSM-2: Following sea EDWs that minimise and maximise the vertical wave bending moment amidships respectively.

  • BSR load cases:

    BSR-1P and BSR-2P: Beam sea EDWs that minimise and maximise the roll motion downward and upward on the port side respectively with waves from the port side.

    BSR-1S and BSR-2S: Beam sea EDWs that maximise and minimise the roll motion downward and upward on the starboard side respectively with waves from the starboard side.

  • BSP load cases:

    BSP-1P and BSP-2P: Beam sea EDWs that maximise and minimise the hydrodynamic pressure at the waterline amidships on the port side respectively.

    BSP-1S and BSP-2S: Beam sea EDWs that maximise and minimise the hydrodynamic pressure at the waterline amidships on the starboard side respectively.

  • OST load cases:

    OST-1P and OST-2P: Oblique sea EDWs that minimise and maximise the torsional moment at 0.25L from the AE with waves from the port side respectively.

    OST-1S and OST-2S: Oblique sea EDWs that maximise and minimise the torsional moment at 0.25L from the AE with waves from the starboard side respectively.

  • OSA load cases:

    OSA-1P and OSA-2P: Oblique sea EDWs that maximise and minimise the pitch acceleration with waves from the port side respectively.

    OSA-1S and OSA-2S: Oblique sea EDWs that maximise and minimise the pitch acceleration with waves from the starboard side respectively.

Note 1: 1 and 2 denote the maximum or the minimum dominate load component for each EDW.

Note 2: P and S denote that the weather side is on port side and on starboard side respectively.

HSA and OSA load cases are not to be used for fatigue assessment.

1.2 Application

1.2.1 The dynamic load cases described in this section are to be used for determining the dynamic loads required by the design load scenarios described in Ch 4, Sec 7. These dynamic load cases are to be applied to the following structural assessments:
  • a) Strength assessment:
  • For plating, ordinary stiffeners and primary supporting members by prescriptive methods.
  • For the direct strength method (FE analysis) assessment of structural members.
  • b) Fatigue assessment:
  • For structural details covered by simplified stress analysis.
  • For structural details covered by FE stress analysis.
Parent topic: Section 2 Dynamic Load Cases
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