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Rules for Classification and Construction I Ship Technology Rules for Classification and Construction I Ship Technology 3 Special Craft 7 Guidelines for the Structural Design of Racing Yachts ≥ 24 m Edition 2012 The following Guidelines come into force on 1 December 2012. Germanischer Lloyd SE Head Office Brooktorkai 18, 20457 Hamburg, Germany Phone: +49 40 36149-0 Fax: +49 40 36149-200 [email protected] www.gl-group.com "General Terms and Conditions" of the respective latest edition will be applicable (see Rules for Classification and Construction, I - Ship Technology, Part 0 - Classification and Surveys). Reproduction by printing or photostatic means is only permissible with the consent of Germanischer Lloyd SE. Published by: Germanischer Lloyd SE, Hamburg I - Part 3 Table of Contents Chapter 7 GL 2012 Page 3 Table of Contents Section 1 General Requirements A. Application, Scope ..................................................................................................................... 1- 1 B. Documents for Approval ............................................................................................................ 1- 2 C. Definitions .................................................................................................................................. 1- 3 Section 2 Materials A. Fiber Reinforced Plastics, Sandwich Constructions and Bonding .............................................. 2- 1 B. Steel Alloys ................................................................................................................................ 2- 1 C. Aluminium Alloys ...................................................................................................................... 2- 2 D. Welding ...................................................................................................................................... 2- 4 E. Corrosion protection .................................................................................................................. 2- 5 F. Cold-molded Wood and Bonding .............................................................................................. 2- 6 Section 3 Design Loads A. General ....................................................................................................................................... 3- 1 B. Lateral Design Pressures ............................................................................................................ 3- 1 C. Design Loads for Keel and Keel Attachments ............................................................................ 3- 4 D. Rudder Design Loads ................................................................................................................. 3- 4 E. Global Loads .............................................................................................................................. 3- 6 Section 4 Design and Scantlings for Composite Structures A. General ....................................................................................................................................... 4- 1 B. Principles for Structural Design ................................................................................................. 4- 1 C. Scantlings ................................................................................................................................... 4- 3 Section 5 Design and Scantlings for Steel and Aluminium Structures A. General ....................................................................................................................................... 5- 1 B. Principles for Structural Design ................................................................................................. 5- 1 C. Scantlings ................................................................................................................................... 5- 6 Section 6 Design and Scantlings for Steel Structures of Yachts L ≥ 48 m A. General ....................................................................................................................................... 6- 1 B. Materials .................................................................................................................................... 6- 1 C. Scantlings ................................................................................................................................... 6- 1 Section 7 Chainplates and Propeller Brackets A. General ....................................................................................................................................... 7- 1 B. Chainplates and substructures .................................................................................................... 7- 1 C. Propeller brackets ....................................................................................................................... 7- 2 Chapter 7 Table of Contents I - Part 3 Page 4 GL 2012 Annex A Keel Fatigue Assessment A. General ........................................................................................................................................ A- 1 B. Fatigue Strength Analysis for Free Plate Edges and for Welded Joints Using Detail Classification .............................................................................................................................. A- 5 C. Fatigue Strength Analysis for Welded Joints Based on Local Stresses ....................................... A- 8 I - Part 3 Section 1 A General Requirements Chapter 7 GL 2012 Page 1–1 Section 1 General Requirements A. Application, Scope of primary hull structural members based on review- ing relevant design drawings and documentation. For 1. Application this purpose, longitudinal strength check will be car- ried out as well as analysis of more local structural 1.1 These Guidelines apply to seagoing monohull design. sailing yachts with a hull length of 24 m and over Implications on structural integrity based on actual (measured in accordance with ISO 8666) for competi- construction performance, skills and methods will not tive racing and recreational use, provided that the be considered. It will be presumed that construction is yacht, approved in accordance therewith, is at all of “best practice”. times employed exclusively under the conditions for which it has been designed, constructed and approved 3.2 Scope and depth of review and that it is equipped and handled in the sense of good seamanship, and operated at a speed adopted to Indicative list of typical items addressed in plan re- the respective wind and sea conditions. view: 2. Scope – Hull shell, deck shell, girders and stiffeners, frames, ring frames, bulkheads, decks, soles, in- 2.1 These Guidelines envisage primarily struc- tegrated tanks, stern and transom, joining of tural integrity of yacht’s hull made of metallic materi- components, global and local reinforcements als or fiber reinforced polymer composites including – Foundations: Main engine foundations structural components listed in 3.2. Any note in this Guideline addressing issues other than structural in- – Keel arrangement, keel bulb, keel fin and its tegrity is to be considered as recommendation or guid- structural attachment to hull; hull structure in ance to designer, builder, owner, et al. way of keel attachment Design of wooden hulls will be treated individually. – Rudder incl. shaft, shaft bearings and their struc- tural integration 2.2 Aspects which go beyond the scope of a – Propeller bracket incl. structural attachment and structural design assessment are written in Italics, and foundation may yet serve as reference and/or recommendation. – Chain plates of standing rigging elements, mast The requirements of these Guidelines do not substitute step foundation the independent judgment of professional designers. This is particularly valid for those aspects not ad- – Structural details such as: window mullions, dressed in these Guidelines and for which the design- pillars, hatch panels (if integral), cut-outs, under ers are solely responsible. water trough-hull penetration design, structural recesses 2.3 Equivalence – Structural attachments of primary structural members as listed above Yachts deviating from the requirements of these Guidelines in their type or design may be approved, Items typically not included in plan review: provided that their structures are recognized to be – Foundations such as of anchor windlass, genera- equivalent to GL's requirements. tors, pumps, safety equipments, mooring equip- ment and/or similar 2.4 Confidentiality – “Lower“ priority details and/or equipment such Amongst other aspects, confidentiality is regulated in as: manholes, access cover details, railings, GL Rules for Classification and Surveys (I-0-0), Sec- mooring cleats, doors and hatches (provided not tion 1, D. integral), platforms or ducts, ladders, stair cases and roofs if not integral with main structures 3. Scope of plan approval – Non-structural partitions and components 3.1 Objectives – Strong points such as foundations for running rigging, mooring applications Essential assessments for structural integrity of hull structures include the review of strength and stiffness – Watertight subdivision, closures, windows Chapter 7 Section 1 B General Requirements I - Part 3 Page 1–2 GL 2012 4. General operating conditions 2.2 Drawings shall be submitted in pdf format in general. The documents to be submitted for Plan Ap- The structural design is to be based on ambient condi- proval are listed below. For the purpose of submis- tions typical to a worldwide unrestricted range
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