HULL STRUCTURAL DESIGN, ALUMINIUM ALLOY

1 RULES FORCLASSIFICATION OFDET NORSKE VERITASV eritasveien 1, NO-1322 H vik, Norway Tel.: +47 67 57 99 00 Fax: +47 67 57 99 11 HIGH SPEED, LIGHT CRAFT AND NAVALSURFACE CRAFTSTRUCTURES, EQUIPMENTPART 3 CHAPTER 3 HULL STRUCTURAL design , ALUMINIUM ALLOYJANUARY 2011 CONTENTSPAGESec. 1 STRUCTURAL 7 Sec. 2 Materials and Material 14 Sec. 19 Sec. 4 Hull Girder Strength .. 21 Sec. 5 Plating and Stiffeners .. 25 Sec. 6 Web Frames and Girder 29 Sec. 7 Pillars and Pillar Bulkheads ..34 Sec. 8 Weld Connections .. 37 Sec. 9 Direct Strength Calculations ..42 Sec. 10 Buckling 45 CHANGES IN THE RULES The electronic pdf version of this document found through is the officially binding version Det Norske VeritasAny comments may be sent by e-mail to subscription orders or information about subscription terms, please use Typesetting (Adobe Frame Maker) by Det Norske VeritasIf 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.

2 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 of October 2010 all DNV service documents are primarily published order to ensure a practical transition from the print scheme to the electronic scheme, all rule chapters havingincorporated amendments and corrections more recent than the date of the latest printed issue, have been given the dateJanuary 2011. An overview of DNV service documents, their update status and historical amendments and corrections may be foundthrough changesSince the previous edition (July 2000), this chapter has been amended, most recently in January 2006.

3 All changespreviously found in have been incorporated and a new date (January 2011) has been given as explainedunder General .In addition, the layout has been changed to one column in order to improve electronic readability. Rules for High Speed, Light Craft and Naval Surface Craft, January 2011 Contents Page 3 DET NORSKE VERITASCONTENTSSec. 1 STRUCTURAL Principles .. 7A. General .. 7A 100 The scantling 7A 200 ALUMINIUM alloys .. 7B. Bottom Structures .. 7B 100 Longitudinal stiffeners .. 7B 200 Web frames .. 7B 300 Longitudinal 7B 400 Engine girders .. 7B 500 Double bottom, if fitted .. 8C. Side Structure .. 8C 100 Stiffeners .. 8D. Deck 8D 100 Longitudinal stiffeners .. 8D 200 Bulwarks .. 8E. Flat Cross 8E 100 Definition.

4 8E 200 Longitudinal stiffeners .. 8F. Bulkhead Structures .. 9F 100 Transverse 9F 200 Corrugated bulkheads .. 9G. Superstructures and 9G 100 Definitions .. 9G 200 STRUCTURAL continuity .. 9H. STRUCTURAL design in General .. 10H 100 Craft arrangement .. 10H 200 Soft local transitions .. 10H 300 Impact strength .. 10I. Some Common Local design Rules .. 10I 100 Definition of span .. 10I 200 Effective girder flange .. 11I 300 Sniped stiffeners .. 12J. Support of Equipment and Outfitting Details .. 12J 100 Heavy equipment, appendages etc.. 12J 200 Minor outfitting details .. 12K. STRUCTURAL Aspects not Covered by Rules .. 12K 100 Deflections .. 12K 200 Local vibrations .. 13 Sec. 2 Materials and Material Protection .. 14A. General.

5 14A 14A 200 Material certificates .. 14B. STRUCTURAL ALUMINIUM ALLOY .. 14B 100 General .. 14B 200 ALUMINIUM 14B 300 Chemical composition .. 14B 400 Mechanical properties .. 14C. Corrosion 16C 100 General .. 16C 200 For information and approval .. 16C 300 Coating .. 16C 400 Cathodic protection .. 17C 500 Other materials in contact with 18D. Other Materials .. 18D 100 Steel .. 18D 200 Connections between steel and 18 Rules for High Speed, Light Craft and Naval Surface Craft, January 2011 Contents Page 4 DET NORSKE VERITASD 300 Fibre Reinforced Plastic (FRP) .. 18 Sec. 3 Manufacturing .. 19A. General .. 19A 100 Basic 19B. Inspection .. 19B 100 General .. 19B 200 Penetrant 19B 300 Radiographic testing .. 19B 400 Ultrasonic examination.

6 19C. Extent of Examination .. 19C 100 General .. 19D. Acceptance Criteria for NDT .. 19D 100 Acceptance 19E. Testing .. 20E 20E 200 Closing appliances .. 20 Sec. 4 Hull Girder 21A. General .. 21A 21A 200 Definitions .. 21B. Vertical Bending Strength .. 21B 100 Hull section modulus requirement .. 21B 200 Effective section 21B 300 Hydrofoil on 22B 400 Longitudinal STRUCTURAL continuity .. 22B 500 Openings .. 22C. Shear Strength .. 23C 100 Cases to be investigated .. 23D. Cases to be 23D 100 Inertia induced loads .. 23E. Transverse Strength of Twin Hull 23E 100 Transverse strength .. 23E 200 Allowable stresses .. 24 Sec. 5 Plating and Stiffeners .. 25A. General .. 25A 25A 200 Definitions .. 25A 300 Allowable 25B. Plating.

7 25B 100 Minimum thicknesses .. 25B 200 Bending .. 26B 300 Slamming .. 26C. Stiffeners .. 27C 100 Bending .. 27C 200 Slamming .. 28 Sec. 6 Web Frames and Girder Systems .. 29A. General .. 29A 29A 200 Definitions .. 29A 300 Minimum thicknesses .. 29A 400 Allowable 30A 500 Continuity of strength members .. 30B. Web Frames and Girders .. 30B 100 General .. 30B 200 Effective flange .. 30B 300 Effective web .. 31B 400 Strength requirements .. 31 Rules for High Speed, Light Craft and Naval Surface Craft, January 2011 Contents Page 5 DET NORSKE VERITASB 500 Girder tripping brackets .. 32B 600 Girder web 33 Sec. 7 Pillars and Pillar 34A. General .. 34A 34A 200 Definitions .. 34B. 34B 100 Arrangement of pillars .. 34B 200 Cross-section particulars.

8 34B 300 Pillar scantlings .. 34B 400 Pillars in 35C. Supporting Bulkheads .. 36C 100 General .. 36 Sec. 8 Weld 37A. General .. 37A 37A 200 Welding particulars .. 37B. Types of Welded Joints .. 37B 100 Butt 37B 200 Tee or cross joints .. 37C. Size of Connections .. 38C 100 Fillet welds, general .. 38C 200 Fillet welds and penetration welds subject to high tensile stresses .. 38C 300 End connections of girders, pillars and cross 39C 400 End connections of 39 Sec. 9 Direct Strength Calculations .. 42A. General .. 42A 42A 42B. Plating .. 42B 100 General .. 42B 200 Calculation procedure .. 42B 300 Allowable 42C. Stiffeners .. 42C 100 General .. 42C 200 Calculation procedure .. 43C 43C 400 Allowable 43D. Girders .. 43D 100 General.

9 43D 200 Calculation methods .. 43D 300 design load 43D 400 Allowable 44 Sec. 10 Buckling Control .. 45A. General .. 45A 100 Definitions .. 45B. Longitudinal Buckling Load .. 46B 100 Longitudinal 46C. Transverse Buckling Load .. 46C 100 Transverse 46D. Plating .. 46D 100 Plate panel in uni-axial compression .. 46D 200 Plate panel in shear .. 48D 300 Plate panel in bi-axial compression and shear .. 48E. Stiffeners in Direction of Compression .. 49E 100 Lateral buckling mode .. 49E 200 Torsional buckling mode .. 50 Rules for High Speed, Light Craft and Naval Surface Craft, January 2011 Contents Page 6 DET NORSKE VERITASE 300 Web and flange buckling .. 51F. Stiffeners Perpendicular to Direction of 51F 100 Moment of inertia of stiffeners.

10 51G. Elastic Buckling of Stiffened Panels .. 52G 100 Elastic buckling as a design basis .. 52G 200 Allowable 52H. Girders .. 53H 100 Axial load 53H 200 Girders perpendicular to direction of 53H 300 Buckling of effective 53H 400 Shear buckling of web .. 54 Rules for High Speed, Light Craft and Naval Surface Craft, January 2011 Page 7 DET NORSKE VERITASSECTION 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.