SmartLVL 15 Design Guide - Tilling Timber

1.2 CONTINUOUS SPANSFor beams continuous over two (2) unequal spans, the design span and the "Resultant Span Description" depend upon the percentagedifference between the two spans as shown below: Note, for continuous spans, the Design Span is taken as the distance between the centreof the supports, as shown in “Design Span” on page 2 of the Design Guide.Span Difference % Effective span Resultant span Description10% max Main span Continuous10 - 30% 1.1 x Main span Continuousabove 30% Main span Singlespan difference = (main span - second span) x 100 main span second span(main span + second span)continuous spans1.4.1 MULTIPLE MEMBER LAMINATINGOF TOP LOADED BEAMS(Symmetrical loading)1.3 RIP SAWINGSmartLVL 15One of the unique properties ofSmartLVL 15 is that it may be rippedthrough the depth to the smallersection sizes as those given in thesespan tables without affecting the basicstrength properties. It is important thatthe new members are not cutundersized if the maximum spans inthese tables are to be used.The edges of the individual sections must be carefully aligned toeach other so that the composite beam is flat, allowing the appliedloads to be equally shared.Depths up to and including 300 mm: 2 rows of nails as shownabove at 300 mm centreDepths in excess of 300 mm: 3 rows of nails as shown above at 300mm centresTemporarywaterproofmembraneBead ofelastomericadhesiveThe sawing through the thickness toproduce sections of a lesser thicknessmay decrease the integrity of theSmartLVL 15 and is therefore NOTrecommended under anycircumstances.Bead ofelastomericadhesive1.4 DOUBLE SmartLVL 15 SECTIONBEAMSBeams of 70, 84 and 116 mm thickness can be formed by nail laminatingtwo sections of SmartLVL 15 as follows.The suggested method of vertical lamination below provides agreater level of fixity between individual components, and withthe use of an elastomeric adhesive, also prevents moisture penetrationbetween the laminates.Beam thickness(mm)Individual sectionthickness (mm)Nail Ø (mm)70 35 3.06 7584 42 3.30 90116 58 3.30 100Minimum naillength (mm)DNails driven on alternate sides300 mm spacing300 mm spacingRecommended “during construction” protection from weather for multipleSmartLVL.SmartLVL 15 Design Guide 2