STRUCTURES, EQUIPMENT Hull Structural Design, Aluminium …

1 RULES FOR CLASSIFICATION OFDET NORSKE VERITAS ASThe content of this service document is the subject of intellectual property rights reserved by Det Norske Veritas AS (DNV). The useraccepts that it is prohibited by anyone else but DNV and/or its licensees to offer and/or perform classification, certification and/orverification services, including the issuance of certificates and/or declarations of conformity, wholly or partly, on the basis of and/orpursuant to this document whether free of charge or chargeable, without DNV's prior written consent. DNV is not responsible for theconsequences arising from any use of this document by electronic pdf version of this document found through is the officially binding versionHigh Speed, Light Craft and NavalSurface CraftPART 3 CHAPTER 3 STRUCTURES, EQUIPMENTHull Structural design , Aluminium AlloyJULY 2012 FOREWORDDET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life,property and the environment, at sea and onshore.

2 DNV undertakes classification, certification, and other verification andconsultancy services relating to quality of ships, offshore units and installations, and onshore industries worldwide, andcarries out research in relation to these Rules lay down technical and procedural requirements related to obtaining and retaining a Class Certificate. It is usedas a contractual document and includes both requirements and acceptance criteria. Det Norske Veritas AS July 2012 Any comments may be sent by e-mail to any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas, then Det Norske Veritas shall pay compensation tosuch person for his proved direct loss or damage. However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question, provided thatthe maximum compensation shall never exceed USD 2 this provision Det Norske Veritas shall mean the Foundation Det Norske Veritas as well as all its subsidiaries, directors, officers, employees, agents and any other acting on behalfof Det Norske for High Speed, Light Craft and Naval Surface Craft, July Changes Page 3 DET NORSKE VERITAS ASCHANGESG eneralThis document supersedes the January 2011 affected by the main changes in this edition is highlighted in red colour.

3 However, if the changes involvea whole chapter, section or sub-section, normally only the title will be in red changes coming into force 1 January 2013 Structural Principles Item B501 is amended. Item H300 is deleted. is added. Manufacturing Item A103 is amended. Plating and Stiffeners Item B302 is amended. Pillars and Pillar Bulkheads Item B104 is and ClarificationsIn addition to the above stated rule requirements, a number of corrections and clarifications have been made tothe existing rule text. Rules for High Speed, Light Craft and Naval Surface Craft, July 2012 Contents Page 4 DET NORSKE VERITAS ASCONTENTSSec. 1 Structural Principles .. 8A. General .. 8A 100 The scantling 8A 200 Aluminium alloys.

4 8B. Bottom Structures .. 8B 100 Longitudinal stiffeners .. 8B 200 Web frames .. 8B 300 Longitudinal 8B 400 Engine girders .. 8B 500 Double bottom, if fitted .. 9C. Side structure .. 9C 100 Stiffeners .. 9D. Deck 9D 100 Longitudinal stiffeners .. 9D 200 Bulwarks .. 9E. Flat Cross 9E 100 Definition .. 9E 200 Longitudinal stiffeners .. 9F. Bulkhead Structures .. 10F 100 Transverse 10F 200 Corrugated bulkheads .. 10G. Superstructures and 10G 100 Definitions .. 10G 200 Structural continuity .. 10H. Structural design in General .. 11H 100 Craft arrangement .. 11H 200 Soft local transitions .. 11I. Some Common Local design Rules .. 11I 100 Definition of span .. 11I 200 Effective girder flange .. 12I 300 Sniped stiffeners.

5 13I 400 Floating Frames .. 13J. Support of EQUIPMENT and Outfitting Details .. 13J 100 Heavy EQUIPMENT , appendages etc.. 13J 200 Minor outfitting details .. 14K. Structural Aspects not Covered by Rules .. 14K 100 Deflections .. 14K 200 Local vibrations .. 14 Sec. 2 Materials and Material Protection .. 15A. General .. 15A 15A 200 Material certificates .. 15B. Structural Aluminium Alloy .. 15B 100 General .. 15B 200 Aluminium 15B 300 Chemical composition .. 15B 400 Mechanical properties .. 15C. Corrosion 17C 100 General .. 17C 200 For information and approval .. 17C 300 Coating .. 17C 400 Cathodic protection .. 18C 500 Other materials in contact with 19D. Other Materials .. 19D 100 Steel .. 19D 200 Connections between steel and 19 Rules for High Speed, Light Craft and Naval Surface Craft, July 2012 Contents Page 5 DET NORSKE VERITAS ASD 300 Fibre Reinforced Plastic (FRP).

6 19 Sec. 3 Manufacturing .. 20A. General .. 20A 100 Basic 20B. Inspection .. 20B 100 General .. 20B 200 Penetrant 20B 300 Radiographic testing .. 20B 400 Ultrasonic examination .. 20C. Extent of Examination .. 20C 100 General .. 20D. Acceptance Criteria for NDT .. 20D 100 Acceptance 20E. Testing .. 21E 21E 200 Closing appliances .. 21 Sec. 4 Hull Girder 22A. General .. 22A 22A 200 Definitions .. 22B. Vertical Bending 22B 100 Hull section modulus requirement .. 22B 200 Effective section 22B 300 Hydrofoil on 23B 400 Longitudinal Structural continuity .. 23B 500 Openings .. 23C. Shear 24C 100 Cases to be investigated .. 24D. Cases to be 24D 100 Inertia induced loads .. 24E. Transverse Strength of Twin Hull 24E 100 Transverse strength.

7 24E 200 Allowable stresses .. 25 Sec. 5 Plating and 26A. General .. 26A 26A 200 Definitions .. 26A 300 Allowable 26B. Plating .. 26B 100 Minimum thicknesses .. 26B 200 Bending .. 27B 300 Slamming .. 27C. Stiffeners .. 28C 100 Bending .. 28C 200 Slamming .. 29 Sec. 6 Web Frames and Girder Systems .. 30A. General .. 30A 30A 200 Definitions .. 30A 300 Minimum thicknesses .. 30A 400 Allowable 31A 500 Continuity of strength members .. 31B. Web Frames and Girders .. 31B 100 General .. 31B 200 Effective flange .. 31B 300 Effective web .. 32B 400 Strength requirements .. 32 Rules for High Speed, Light Craft and Naval Surface Craft, July 2012 Contents Page 6 DET NORSKE VERITAS ASB 500 Girder tripping brackets.

8 33B 600 Girder web 34 Sec. 7 Pillars and Pillar 35A. General .. 35A 35A 200 Definitions .. 35B. 35B 100 Arrangement of pillars .. 35B 200 Cross-section particulars .. 35B 300 Pillar 35B 400 Pillars in 36C. Supporting Bulkheads .. 37C 100 General .. 37 Sec. 8 Weld 38A. General .. 38A 38A 200 Welding particulars .. 38B. Types of Welded 38B 100 Butt 38B 200 Tee or cross joints .. 38C. Size of Connections .. 39C 100 Fillet welds, general .. 39C 200 Fillet welds and penetration welds subject to high tensile stresses .. 39C 300 End connections of girders, pillars and cross 40C 400 End connections of 40 Sec. 9 Direct Strength Calculations .. 43A. General .. 43A 43A 43B. Plating .. 43B 100 General.

9 43B 200 Calculation procedure .. 43B 300 Allowable 43C. Stiffeners .. 43C 100 General .. 43C 200 Calculation procedure .. 44C 44C 400 Allowable 44D. Girders .. 44D 100 General .. 44D 200 Calculation methods .. 44D 300 design load 44D 400 Allowable 45 Sec. 10 Buckling Control .. 46A. General .. 46A 100 Definitions .. 46B. Longitudinal Buckling Load .. 47B 100 Longitudinal 47C. Transverse Buckling Load .. 47C 100 Transverse 47D. Plating .. 47D 100 Plate panel in uni-axial compression .. 47D 200 Plate panel in shear .. 49D 300 Plate panel in bi-axial compression and shear .. 49E. Stiffeners in Direction of Compression .. 50E 100 Lateral buckling mode .. 50E 200 Torsional buckling mode .. 51 Rules for High Speed, Light Craft and Naval Surface Craft, July 2012 Contents Page 7 DET NORSKE VERITAS ASE 300 Web and flange buckling.

10 52F. Stiffeners Perpendicular to Direction of 52F 100 Moment of inertia of stiffeners .. 52G. Elastic Buckling of Stiffened Panels .. 53G 100 Elastic buckling as a design basis .. 53G 200 Allowable 53H. Girders .. 54H 100 Axial load 54H 200 Girders perpendicular to direction of 54H 300 Buckling of effective 54H 400 Shear buckling of web .. 55 Rules for High Speed, Light Craft and Naval Surface Craft, July 2012 Page 8 DET NORSKE VERITAS ASSECTION 1 Structural PRINCIPLESA. GeneralA 100 The scantling reduction101 The scantling reductions for high speed and light craft structures compared with Rules for Classificationof Ships are based on: longitudinal framing in bottom and strength deck extended longitudinal and local buckling control a sea and weather service 200 Aluminium alloys201 The alloy grades are listed in Tables B1 to The various formulae and expressions involving the factor f1 may be applied when.