Small craft. Hull construction and scantlings. Part 7: Determination of loads for multihulls and of their local scantlings using ISO 12215-5 (ISO 12215-7:2020)
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This document defines the dimensions, local design pressures and global loads acting on multihull craft with a hull length (LH) or load line length of up to 24 m (see Note). It considers all parts of the craft that are assumed watertight or weathertight when assessing stability, freeboard and buoyancy in accordance with ISO 12217 (all parts). Scantlings corresponding to the local design pressures are then assessed using ISO 12215-5. NOTE The load line length is defined in the OMI "International Load Lines Convention 1966/2005", it can be smaller than LH for craft with overhangs. This length also sets up at 24 m the lower limit of several IMO conventions. This document is applicable to multihulls built from the same materials as in ISO 12215-5, in intact condition, and of the two following types: — recreational craft, including recreational charter vessels; — commercial craft and workboats. It is not applicable to multihull racing craft designed only for professional racing. This document is applicable to the structures supporting windows, portlights, hatches, deadlights and doors. For the complete scantlings of the craft, this document is intended to be used in conjunction with ISO 12215-8 for rudders, ISO 12215-9 for appendages of sailing craft and ISO 12215-10 for rig loads and rig attachment in sailing craft. ISO 12215-6 can be used for additional details. Throughout this document, unless otherwise specified, dimensions are in (m), areas in (m2), masses in (kg), forces in (N), moments in (Nm), Pressures in (kN/m2) (1 kN/m2 = 1 kPa), stresses and elastic modulus in (N/mm2) (1 N/mm2 = 1 MPa).
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Sisällysluettelo
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
6.2 Areas
7 Dimensions and pressure for panels and stiffeners under local loads
7.1 General
7.2 Example of application on multihulls
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
9.5 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
12.4 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
12.10 Global load case GLC 5: Longitudinal force on one hull
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 Application sheet of ISO 12215-7 (informative)
Annex B "Established practice" recommendations for global loads assessment using FEM methods and reporting (informative)
Annex C "Established practice" details (informative)
Annex D Technical background and example of torsional moment analysis with differential deflection of crossbeams (informative)
ISO 12215-10:2020 Small craft -- Hull construction and scantlings -- Part 10: Rig loads and rig attachment in sailing craft
ISO 12215-5:2019 Small craft -- Hull construction and scantlings -- Part 5: Design pressures for monohulls, design stresses, scantlings determination
ISO 12215-8:2009 Small craft -- Hull construction and scantlings -- Part 8: Rudders
ISO 12215-10:2020 Small craft -- Hull construction and scantlings -- Part 10: Rig loads and rig attachment in sailing craft
ISO 12215-5:2019 Small craft -- Hull construction and scantlings -- Part 5: Design pressures for monohulls, design stresses, scantlings determination
ISO 12215-8:2009 Small craft -- Hull construction and scantlings -- Part 8: Rudders
ISO 12215-9:2012 Small craft -- Hull construction and scantlings -- Part 9: Sailing craft appendages
ISO 12217-1:2015 Small craft -- Stability and buoyancy assessment and categorization -- Part 1: Non-sailing boats of hull length greater than or equal to 6 m
ISO 12217-2:2015 Small craft -- Stability and buoyancy assessment and categorization -- Part 2: Sailing boats of hull length greater than or equal to 6 m
ISO 12217-3:2015 Small craft -- Stability and buoyancy assessment and categorization -- Part 3: Boats of hull length less than 6 m
ISO 8666:2020 Small craft -- Principal data