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BS EN ISO 12215-5:2019:2023 Edition

BS EN ISO 12215-5:2019:2023 Edition

$215.11

Small craft. Hull construction and scantlings – Design pressures for monohulls, design stresses, scantlings determination

Published By Publication Date Number of Pages
BSI 2023 138
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This document defines the dimensions, design local pressures, mechanical properties and design stresses for the scantlings determination of monohull small craft with a hull length (LH) or a load line length (see NOTE 1) of up to 24 m. It considers all parts of the craft that are assumed to be watertight or weathertight when assessing stability, freeboard and buoyancy in accordance with ISO 12217.

NOTE 1 The load line length is defined in the IMO “International Load Lines Convention 1966/2005”, it can be larger than LH for craft with overhangs. This length also sets up at 24 m the lower limit of several IMO conventions.

The main core of this document determines the local design pressures and stresses for monohulls and details the possible scantlings methods derived from these pressures and stresses, both for monohulls and multihulls (see NOTE 2). The assessment process requires, where relevant, the application of Annexes.

This document is applicable to small craft, in intact condition, of the two following types:

  • recreational craft, including recreational charter vessels;

  • small commercial craft and workboats, see Clause 12 and Annex J.

It is not applicable to racing craft designed only for professional racing.

NOTE 2 Local pressures and stresses for multihulls are given in ISO 12215-7.

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 with ISO 12215-8 for rudders, ISO 12215-9 for appendages and ISO 12215-10 for rig loads and rig attachments.

This document covers small craft built from the following materials:

  • fibre-reinforced plastics, either in single skin or sandwich construction;

  • aluminium or steel alloys;

  • glued wood or plywood (single skin or sandwich), excluding traditional wood construction;

  • non-reinforced plastics for craft with a hull length less than 6 m (see Annex D).

Throughout this document, unless otherwise specified, dimensions are in (m), areas in (m2), masses in (kg), forces in (N), moments in (N.m), pressures in kN/m2 (1 kN/m2 = 1 kPa), stresses and elastic modulus in N/mm2 (1 N/mm2 = 1 Mpa). Max(a;b;c) means that the required value is the maximum of a, b, and c; and min(d;e;f) means that the required value is the minimum of d, e, and f.

PDF Catalog

PDF Pages PDF Title
2 undefined
17 5.1 Materials
5.2 Overall procedure for scantlings determination
18 6.1 Dimensions and data
6.2 Areas
6.2.1 General
20 7.1 General
21 7.2 Rectangular grid of panels and stiffeners
23 7.3 Non-rectangular panels
7.3.1 Trapezoidal or triangular panels
24 7.3.2 Other shapes
25 7.4 Pressure on a panel or a stiffener
26 8.1 General
8.2 Design category factor kDC
8.3 Dynamic load factor kDYN
27 8.4 Longitudinal pressure distribution factor kL
28 8.5 Area pressure reduction factor kAR
29 8.6 Superstructures and deckhouse pressure reduction factor kSUP
8.7 Pressure correcting factor kSLS for slamming of light and stable sailing craft
30 9.1 Design pressure for motor craft
32 9.2 Design pressure for sailing craft
33 9.3 Watertight bulkheads and integral tank boundaries design pressure
9.3.1 General
34 9.3.2 Integral tanks wash plates
9.3.3 Collision bulkheads
9.3.4 Non-watertight or partial bulkheads
9.3.5 Centreboards of lifting keel wells
35 9.3.6 Transmission of pillar loads
9.3.7 Loads from outboard engines
10.1 Boat building quality factor kBB
36 10.2 Assessment method factor kAM
10.3 Design stresses according to material and calculation method
38 11.1 The six available methods
11.2 Method 1: “Simplified” method
39 11.3 Method 2: “Enhanced” method (ply by ply analysis)
11.4 Method 3: “Developed” method for any laminate, including non-balanced laminates
11.5 Method 4: “Direct test method”
11.6 Method 5: “FEM” Finite Element Method
11.6.1 General considerations
40 11.6.2 General guidance for assessment by 3-D numerical procedures
11.6.3 Boundary assumptions and load application
11.6.4 Model idealisation
11.7 Method 6: Alternative test: Drop test
41 11.8 “Good practice” minimal thickness
13.1 General
13.2 Normal mode of operation
13.3 Information to take care of sandwich plating
13.4 Information required by Annex J for commercial craft and workboats

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BS EN ISO 12215-5:2019
$215.11