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

Amended July 2011, see page 3 Rules for High Speed, Light Craft and Naval Surface Craft, January 2011Pt.3 Ch.3 Sec.8 – Page 41s = spacing between stiffeners in mp = design pressure in kN/m 2 as given in Ch.1f w = as given in 302.Table C1 c-factorsType of connectionStiffener or bracket on top of stiffener(see Fig. 3)None Single-sided Double-sideda 1.00 1.25 1.00b 0.90 1.15 0.90c 0.80 1.00 0.80403 Various standard types of connections are shown in Fig.3.Other types of connection will be considered in each case.STIFFNER ORBRACKETaTHIS DISTANCE SHOULD BEAS SHORT AS POSSIBLESTIFFNER ORBRACKETbLUGSTIFFNER ORBRACKETcFig. 3End connections404 Connection lugs are to have a thickness not less than the web plate thickness.405 Lower ends of peak frames are to be connected to the floors by a weld area not less than:a=0.105 l sp------------------------- (cm 2 )f wl, s p and f w = as given in 402.406 Bracketed end connections as mentioned in 407 and 408 are to have a weld area not less than:kZa = -------- (cm 2 )f w hZ = section modulus of stiffener in cm 3h = stiffener height in mmk = 24 for connections between supporting plates in double bottoms and transverse bottom frames orreversed frames= 25 for connections between the lower end of main frames and brackets= 15 for brackets fitted at lower end of tween deck frames, and for brackets on stiffeners= 10 for brackets on tween deck frames carried through the deck and overlapping the underlying bracketf w = as given in 302.DET NORSKE VERITAS AS