SmartLVL 15 Design Guide - Tilling Timber

1. SmartLVL ® 15DescriptionSmartLVL 15 is a Douglas Fir structural laminated veneer lumber(LVL) manufactured by Pacific Woodtech Corporation, WashingtonState, USA to meet the quality controlled process requirements ofAS/NZS 4357 - Structural Laminated Veneer Lumber.QualityCompliance with process based quality controlrequirements is third party audited by SAI-Global,and the audits, together with end product testingis used as the basis for Product Certification bySAI-Global as a JAS-ANZ accredited Product Certificationbody.AS 4357 Lic SMKB25220SAI Global JAS-ANZ stands for the governmentestablished “Joint AccreditationSystem of Australia and New Zealand” which existsas the peak organisation for accreditation of ProductCertification bodies.Preservative Treatment optionsStock SmartLVL 15 is H2s (glue line) treated for use South of theTropic of Capricorn. It can be post- production pressure treated toH2 or H3 to AS/NZS 1604.4 .Short term water repellencySmartLVL now comes with a clear new generation short term waterrepellency H 2 O Shield to replace the old fashioned wax sealersused by most other LVL manufacturers. H 2 O Shield is a water-based sealer specifically formulated and exclusively licensed inAustralia to Tilling Timber Pty Ltd.H 2 O shield offers numerous key benefits:i) High-penetrating surface treatmentii) Formulated to repel rain during storage and constructioniii) Includes a biocide/fungicideiv) Paintable - acrylic and oil based coatingsv) Glueable – using standard construction adhesivesbetween the LVL and woodor plaster productsvi) When transporting or walkingon the LVL, it does notbecome slippery like the waxsurface coatingvii) Environmentally friendlyUsers will notice that the new sealer absorbsinto the wood instead of leaving a film on top of the surfaces,which is the key to its added benefits.1.1 SmartLVL DESIGN/EFFECTIVE SPANNormal structural analysis uses the centreline representation ofthe member. The term “span” can be defined in a number ofways and these are defined as follows:Clear Span. This is the distance between the faces of any support.It is generally the one easiest to measure and read from thedrawingsNominal span/centre-line span. This is the distance between thecentre of the supports. This span is used to determine bendingmoments and deflections for continuous spaning membersDesign span/Effective span. This is the span used for single spanmembers to determine the bending moment, the slenderness ofbending members and the deflections. In NZS 3603 this is thedimension referred to as “L”, and is defined below.Design span/Effective span is the distance between -The centre of the bearing at each end of a beam wherethe bearing lengths have NOT been conservatively sizedThe centre of notional bearing that have been sized appropriately,where the size of the bearing IS conservative.Diagram (a) shows beam where bearingshave been designed appropriately.The effective span is taken as thedistance between the centre of eachbearing areaClear span (Distance between face of supports)Effective span (design span L)Diagram (b) shows beam where bearingsat each end have been oversized.(This is frequently the case for beamsthat bear onto brickwork or concretewalls where the thickness of the wallis in excess of the area required togive the beam bearing capacity).To find the correct effective span:Effective span (design span) LClear span (Distance between face of supports)Area of supportrequired forbearingLength ofeffectivebearing.Length oforiginalbearing(oversized)1. Calculate the minimum bearingrequired to carry the loads satisfactorilyCentre-line span (distance betweeen centres of supports)SmartLVL 15 Design Guide 1