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ISO 12215-7:2020 Small craft - Hull construction and scantlings - Part 7: Determination of loads for multihulls and of their local scantlings using ISO 12215-5 >
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ISO 12215-7:2020 Small craft - Hull construction and scantlings - Part 7: Determination of loads for multihulls and of their local scantlings using ISO 12215-5, 2020
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols
- 5 Application of this document
- 5.1 Materials
- 5.2 Limitations
- 5.3 Overall procedure for the application of this document
- 6 Main dimensions, data and areas
- 6.1 Dimensions and data
- 6.1.1 General
- 6.1.2 Bottom deadrise of the hulls βx and chine beam BCx of planing multihulls
- 6.1.3 Wet deck bottom
- 6.1.4 Crossbeams
- 6.2 Areas
- 7 Dimensions and pressure for panels and stiffeners under local loads
- 7.1 General
- 7.2 Example of application on multihulls
- 7.2.1 Sections
- 7.2.2 Details on panel assessment and dimensions
- 7.2.3 The constant averaged pressure method
- 7.2.4 Other assessment and dimensioning methods
- 7.2.5 Panels acting as "natural" stiffeners
- 7.3 Other topics on panel or stiffener dimensions
- 8 Local pressure-adjusting factors
- 9 Local design pressures
- 9.1 General
- 9.2 Limits of areas
- 9.3 Tables defining the local design pressures for multihulls
- 9.4 Design pressure for trimaran floats PTRFx
- 9.4.1 Pressure reduction factors
- 9.4.2 Pressure
- 9.5 Design pressure on watertight bulkheads and integral tanks
- 10 Further treatment of structural elements subject to local loads
- 11 Assessment of multihulls rudders, appendages and their wells
- 12 Multihull global loads
- 12.1 General
- 12.2 Typical structural arrangements
- 12.3 Global load assessment
- 12.3.1 General
- 12.3.2 The simplified method
- 12.3.3 The enhanced method
- 12.4 Design stresses under global loads
- 12.5 Global load case GLC1: Diagonal load in quartering sea
- 12.6 Global load case GLC 2: Rig loads
- 12.7 Combination of diagonal load GLC 1 and rig load GLC 2 for sailing multihulls
- 12.8 Global load case GLC 3: Asymmetric broaching loads in sailing multihulls
- 12.9 Global load case GLC 4: Longitudinal broaching/pitchpoling
- 12.9.1 General
- 12.9.2 Full method of analysis of the buoyancy load when the craft pitchpoles
- 12.10 Global load case GLC 5: Longitudinal force on one hull
- 12.10.1 General
- 12.10.2 Longitudinal force
- 12.11 Global load case GLC 6: Bending of crossbeams connecting hulls for motor catamarans.
- 13 Structural arrangement for supporting global loads
- 14 Multihulls used as commercial craft and workboats
- 15 Information to be included in the owner's manual
- 15.1 General
- 15.2 Respect of maximum loaded displacement
- 15.3 Operational guidance
- 15.4 Information to take care of sandwich plating
- 15.5 Information required by Annex J of ISO 12215-5:2019 - for commercial craft and workboat
- Annex A (informative) Application sheet of ISO 12215-7
- Annex B (informative) "Established practice" recommendations for global loads assessment using FEM methods and reporting
- Annex C (informative) "Established practice" details
- Annex D (informative) Technical background and example of torsional moment analysis with differential deflection of crossbeams
- Bibliography [Go to Page]