RULES DET NORSKE VERITAS (DNV) = STRUCTURES = - Boat Design Net

More documents

Recommendations

Info

Amended July 2011, see page 3 Rules for High Speed, Light Craft and Naval Surface Craft, January 2011Pt.3 Ch.3 Sec.1 – Page 13st ft wr=b f for unsymmetrical free flanges=s – t w for box girder flanges= spacing of supporting webs for box girder (nun)= face plate thickness in general (mm)=t w (maximum) for unsymmetrical free flanges= web plate thickness (mm)= radius of curved face plate (mm)Fig. 3Effective width of curved face plates for alternative boundary conditions202 The effective width of curved plate flanges, or effective width of plate at knuckles, is to be speciallyconsidered.I 300 Sniped stiffeners301 Stiffeners with sniped ends may be allowed where dynamic loads are small and vibrations considered tobe of small importance.J. Support of Equipment and Outfitting DetailsJ 100 Heavy equipment, appendages etc.101 Whether the unit to be supported is covered by classification or not, the forces and moments at points ofattachment have to be estimated and followed through hull reinforcements in line, through craft girder andpillar system (taking into account hull stresses already existing) until forces are safely carried to craft's side orbulkheads.102 Doublers should be avoided normal to a tensile force.J 200 Minor outfitting details201 Generally connections of outfitting details to the hull are to be such that stress-concentrations areminimized and welding to high stressed parts are avoided wherever possible.Connections are to be designed with smooth transitions and proper alignment with the hull structure elements.Terminations are to be supported.202 Connections to topflange of girders and stiffeners are to be avoided if not well smoothened. Preferablysupporting of outfittings are to be welded to the stiffener web.K. Structural Aspects not Covered by RulesK 100 Deflections101 Requirements for minimum moment of inertia or maximum deflection under load are limited to structurein way of hatches and doors and some other special cases.102 Deflection problems in general are left to designer's consideration.DET NORSKE VERITAS AS
Rules for High Speed, Light Craft and Naval Surface Craft, January 2011 Amended July 2011, see page 3Pt.3 Ch.3 Sec.1 – Page 14K 200 Local vibrations201 The evaluation of structural response to vibrations caused by impulses from engine and propeller bladesand jet units are not covered by the classification, but the builder is to provide relevant documentation.Guidance note:HSC Code 3.4:Cyclic loads, including those from vibrations which can occur on the craft should not:a) impair the integrity of structure during the anticipated service life of the craft or the service life agreedwith the Administration;b) hinder normal functioning of machinery and equipment; andc) impair the ability of the crew to carry out its duties.---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---Upon request such evaluation may be undertaken by the Society.DET NORSKE VERITAS AS
Page 1 and 2: RULESDET NORSKE VERITAS (DNV)= STRU
Page 3 and 4: FOREWORDDET NORSKE VERITAS (DNV) is
Page 5 and 6: Rules for High Speed, Light Craft a
Page 29 and 30: FOREWORDDET NORSKE VERITAS (DNV) is
Page 39: Rules for High Speed, Light Craft a
Page 83: Rules for High Speed, Light Craft a

RULES DET NORSKE VERITAS (DNV) = STRUCTURES = - Boat Design Net

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?