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BS EN ISO 12215-7:2020

BS EN ISO 12215-7:2020

$198.66

Small craft. Hull construction and scantlings – Determination of loads for multihulls and of their local scantlings using ISO 12215-5

Published By Publication Date Number of Pages
BSI 2020 68
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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 L H 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).

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
10 3 Terms and definitions
12 4 Symbols
14 5 Application of this document
5.1 Materials
5.2 Limitations
15 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
16 6.1.3 Wet deck bottom
6.1.4 Crossbeams
19 6.2 Areas
22 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
24 7.2.2 Details on panel assessment and dimensions
7.2.3 The constant averaged pressure method
25 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
32 9 Local design pressures
9.1 General
9.2 Limits of areas
9.3 Tables defining the local design pressures for multihulls
35 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
36 11 Assessment of multihulls rudders, appendages and their wells
12 Multihull global loads
12.1 General
12.2 Typical structural arrangements
38 12.3 Global load assessment
12.3.1 General
12.3.2 The simplified method
39 12.3.3 The enhanced method
40 12.4 Design stresses under global loads
12.5 Global load case GLC1: Diagonal load in quartering sea
41 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
42 12.9 Global load case GLC 4: Longitudinal broaching/pitchpoling
12.9.1 General
43 12.9.2 Full method of analysis of the buoyancy load when the craft pitchpoles
44 12.10 Global load case GLC 5: Longitudinal force on one hull
12.10.1 General
12.10.2 Longitudinal force
45 12.11 Global load case GLC 6: Bending of crossbeams connecting hulls for motor catamarans.
46 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
47 Annex A (informative) Application sheet of ISO 12215-7
49 Annex B (informative) “Established practice” recommendations for global loads assessment using FEM methods and reporting
51 Annex C (informative) “Established practice” details
59 Annex D (informative) Technical background and example of torsional moment analysis with differential deflection of crossbeams
66 Bibliography

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BS EN ISO 12215-7:2020
$198.66