EWPAA Structural Plywood and LVL Design Manual - Engineered ...

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SpeciesAsh, Alpine – Eucalyptus delegatensisAsh, Mountain – Eucalyptus regnansAsh, Silvertop – Eucalyptus sieberiBeech Myrtle – Nothofagus cunninghamiiBlackbutt – Eucalyptus pilularisBlackbutt, New England – Eucalyptus andrewsiiBlackbutt, WA – Eucalyptus pantensBlackwood – Acacia melanoxylonBloodwood Red – Corymbia gummiferaBox, Brush – Lopehostman confertusBox, Grey – Eucalyptus microcarpaBox, Grey, Coast – Eucalyptus bosistoanaBrownbarrel – Eucalyptus fastigataGum, Blue, Sydney – Eucalyptus salignaGum, Blue, Southern (TAS) – Eucalyptus globulusGum, Blue, Southern (VIC) – Eucalyptus globulusGum, Manna – Eucalyptus viminalisGum, Red, River – Eucalyptus camaldulensisGum, Rose – Eucalyptus grandisGum, Shining – Eucalyptus nitensSpeciesGum, Spotted – Corymbia maculataGum, Sugar – Eucalyptus CladocalyxGum, Yellow – Eucalyptus leucoxylonIronbark, Grey – Eucalyptus drepanophyllaIronbark, Red – Eucalyptus sideroxylonJarrah – Eucalyptus marginataKarri – Eucalyptus diversicolorMahogany, Red – Eucalyptus resiniferaMarri – Eucalyptus calophyllaMerbau – Instia bijugaMessmate – Eucalyptus obliquePine, Baltic – Picea abiesPine, Radiata – Pinus RadiataPine, White Cypress – Callitris glaucophyllaSheoak, WA – Allocosuarina fraseranaStringybark, Yellow – Eucalyptus muelleranaTallowwood – Eucalyptus microcorysTurpentine – Syncarpa glomuliferaWattle, Silver – Acacia dealbataTABLE 16.4 : Suitable veneer species for plywood constructionThe timber species listed in Table 16.4 have been tested and achieve the following performance when tested inaccordance with AS/NZS 3837:1998 and using the Method of Kokkala, Thomas and Karisson to calculate Material groupnumber.Material Group Number 3Average Extinction areaLess than 250m 2 kgFloor MaterialsTests done by WFRA in accordance with AS ISO 9239.1-2003 resulted in the plywood constructions givenin Table 16.5.SpeciesThickness(mm)PerformanceCritical Radiant Heat FluxPine, Hoop – Araucaria cunninghamiiPine, Radiata – Pinus RadiataPine, Slash – Pinus elliotti(plywoods with no substrate)15 or >17 or >17 or >Between 2.2 (kW/m 2 ) and4.5 (kW/m2 )Less than 750(%-min)Early Fire Indices – To AS 1530.3TABLE 16.5 : Plywood FlooringTable 16.6 gives the relevant data regarding early fire hazard tests for both untreated and fire retardanttreated plywood which is no longer acceptable. If fire retardant plywood is desired treatment must beby impregnation with fire retardant salts and must be certified to show compliance with the buildingregulations.245
PLYWOOD (UNTREATED)Face veneer’sCommonNameBotanical NameSpread ofFlameIndex(0-10)SmokeDevelopedIndex(0-10)ReportReferenceAustralian RedCedarToona australis 9 9 E.B.S. 5/10/76E.4248Australian RedCedar (grooved)Toona australis 8 2 E.B.S 5/10/78E.4250Blackbean Castanospermum australe 9 3 E.B.S 5/10/78E.4238Coachwood Ceratopetalum apetalum 8 2 E.B.S. 5/10/78E.4235Hickory Ash(grooved)Flindersia ifflaiana 8 3 E.B.S. 5/10/78E.4249Klinkii pine Aurancaria hunsteinii 8 4 E.B.S. 5/10/78E.4245LauanParashorea Spp.Shorea Spp.8 3 E.B.S. 5/10/78E.4244Meranti Shorea Spp. 8 2 E.B.S. 5/10/78E.4240Pacific Maple Shorea Spp. 8 2 E.B.S. 5/10/78E.4240QueenslandMapleFlindersia brayleyana 8 2 E.B.S. 5/10/78E.4239QueenslandWalnutEndiandra palmerstoni 8 3 E.B.S. 5/10/78E.4241Radiata Pine Pinus radiata 8 2 E.B.S. 5/10/78E.4237Radiata Pine(scorched and brushed surface)Pinus radiata 7 2 E.B.S. 5/10/78E.4246Sapele Entandrophragma cylindricum 8 2 E.B.S. 5/10/78E.4243Silver Ash Flindersia bourjotiana 8 3 E.B.S. 5/10/78E.4242Tasmanian OakMixture of:Euc. obliquaEuc. delegatensisEuc. regnans8 2 E.B.S. 5/10/78E.4236Teak Tectona grandis 8 3 E.B.S. 5/10/78E.4247Victorian AshMixture of:Euc. regnansEuc. delegatensis8 2E.B.S. 5/10/78TIMBERS AND PLYWOODS TREATED WITH FIRE RETARDANTSTimber Species Treatment Spread ofFlameIndex(0-10)SmokeDevelopedIndex(0-10)ReportReferenceHoop Pine Retardant Impregnated 0 2 (a)RedwoodWesternRed CedarSurface coated with 3 coats offire retardant0 5 E.B.S. 23/2/79E.4362Surface coated with 1 coat offire retardant 8 4 E.B.S. 23/2/79E.4361Surface Coated with 3 coats of 0 4 E.B.S. 23/2/79fire retardantE.4360Surface coated with 1 coat of 8 4 E.B.S. 23/2/79fire retardantYellow Walnut Retardant impregnated 0 1 (a)REFERENCES: (a) *’Early Burning Properties of Australian Building Timber’, J. Beesley, J.J. Keogh, A.W. Moulen, Division of Building ResearchTechnical Paper No. 6 24 pages published by C.S.I.R.O. 1974The contents of this publication may be reproduced provided acknowledgement is made to the Timber Development Association (N.S.W.) Ltd.Extracts should not be published without prior reference to T.D.A.TABLE 16.6: Early Fire Hazard Data for Untreated and Fire Retardant Treated Plywood246
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Structural Plywood & LVL Design Man
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Table of Contents1 Plywood & LVL -
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11 Plywood Stressed Skin Panels ...
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Table of FiguresFIGURE 4.1: Plywood
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Part OneProduct Production & Proper
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PeelingAfter conditioning, the logs
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Sanding, Trimming and BrandingAfter
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through to applications where aesth
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2.7 Identification CodeThe plywood
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2.10 Non Structural PlywoodsInterio
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3.5 Veneer QualityVeneer quality us
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the hygroscopic movement of structu
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effective an insulator as the wood
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5 Structural Plywood - Design Princ
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12 - 13 40015 - 19 45020 - 25 52026
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TABLE 5.3: Standard Structural Plyw
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TABLE 5.5: Indicative Stiffness Val
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Strength Limit StateStrength LimitS
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Application of Structural memberAll
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FIGURE 5.5 shows an I-beam defining
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j 2- Duration of Load Factor for Cr
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Using the theory of parallel axes a
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6 Structural LVL - Design Principle
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I (neutral axis(NA)-stiffness= (bd
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Serviceability Limit State:Calculat
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Strength Limit State:Strength Limit
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Equilibrium Moisture Content (EMC)P
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(c) For shear k 11 = 1.0(d) For com
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Chapter 6 AppendixSlenderness Co-Ef
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FIGURE A6.3: Continuous restraint a
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Stability factor.The stability fact
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7.4 Structural Plywood Flooring - D
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5. Critical Load Action EffectsLoad
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5. Serviceability limit state - Des
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7.10 Structural Plywood Residential
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Because of the obvious difficulty a
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1.2 m roof load width)0.25 kPa x 1.
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Concentrated Imposed Load (Q)M max
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5. Serviceability Limit Stateand [A
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8 Structural Plywood Webbed Box Bea
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AdhesivesBeams relying only on an a
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5. Check Beam Stiffness:Check beam
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1. Initial beam trial size:(a)(b)Fr
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Required nail spacing s = øN j / q
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Figure 8.5 shows a discontinuous pl
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A8Chapter 8 AppendixBending / Compr
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where:A= h3.5 3D .1032 N. mJ12.440.
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FIGURE A8.2: Guide for Selecting In
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Table A8.6: Unit-Load Deflection Sp
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9 Structural Plywood Diaphragms & S
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FIGURE 9.3 shows a plywood panel na
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The following are the design steps
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Wind force, w on diaphragm w = 1.86
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Converted to Limit States CapacityC
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4. Chord Size and SplicesThe chords
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Load/Nail (N)Nail Deformation (mm)2
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• The horizontal force is 1.9 x 2
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= 5 kN/m v oR = 15/5 = 3 kN/m107
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ELEVATIONFIGURE 9.12: Shows shear f
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As previously mentioned the shearwa
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Assuming the applied racking load t
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In this instance let the two panels
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A9 CHAPTER 9 APPENDIXPlate 1Plate 2
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Plate 7Plate 8Plate 9119
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REFERENCES CITED:1. Timber Shearwal
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“nailability” by increasing res
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(a) (b) (c)FIGURE 10.3: Actual and
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Re-arranging the torsion equation r
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The polar moment of area (I p ) of
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Design Example - Plywood Gusseted P
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• assuming width of lines paralle
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hence:where:ΦMj⎡ Ip⎤= (0.8 x1.
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A10 Chapter 10 AppendixPhotographs
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MOMENT JOINTSPlate 7Plate 8Plate 9(
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REFERENCES CITED:1. Investigation o
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11.2 MaterialsPlywoodPlywood used i
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FIGURE 11.3: Effective widths of pl
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Transformed SectionSince the plywoo
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FIGURE 11.5: Bending stresses in st
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FIGURE 11.6: Stressed skin panel tr
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Flexural Deflection Long Term Servi
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Compression SpliceUsing 17mm F11 st
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REFERENCES CITED:1. Design & Fabric
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12 Exotic Structural Forms12.1 Intr
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displacement between diaphragms eac
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The section modulus (Z) is:ZZ=Iy1=1
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FIGURE 12.9: A parabolic arch (not
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F AFFFASS= (374.4 + 166.4)kN= 540.8
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12.11 Hypar Design - GeometryTo dev
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FIGURE 12.16: Reactive force compon
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12.14 Methodology - Principal Membr
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Many braced dome geometries exist b
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θasphere= is the angle subtended b
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AndNNNxyxyP=L21P=L12P=L33L2P3⎤+
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• whether or not to force the ply
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A12Chapter 12 AppendixEXAMPLES OF E
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EXOTIC STRUCTURAL FORMS DESIGN AIDS
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Type 1 joints referred to in AS 172
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FIGURE 13.3: Two and Three member T
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SECTION 4 : AS 1720.1-1997 : Clause
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connection load carrying capacity c
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Page 210 and 211: 13.11 Design of Type 2 Screwed Conn
Page 212 and 213: The reasons k 13 and k 14 are not c
Page 214 and 215: Type of JointSeasoned TimberUnseaso
Page 216 and 217: 13.16 Design of Type 2 Bolted Conne
Page 218 and 219: where:Δ = Δi +h33j14xh35Q *Qkpfor
Page 220 and 221: The exploded view in Figure 13.11 s
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Page 226 and 227: REFERENCES CITED:1. AS 1720.1-1997,
Page 228 and 229: Plate 3Plate 4219
Page 230 and 231: Plate 7Plate 8221
Page 232 and 233: 14 Noise Control14.1 IntroductionTh
Page 234 and 235: The absorption process of a single
Page 236 and 237: When it is required to add more tha
Page 238 and 239: FIGURE 14.5: Types of cavity wallsT
Page 240 and 241: 15 Condensation & Thermal Transmiss
Page 242 and 243: 15.4 Thermal TransmissionThermal tr
Page 244 and 245: 15.5 Thermal Transmission - Design
Page 246 and 247: REFERENCES CITED:1. Condensation, C
Page 248 and 249: The early fire hazard test indices
Page 250 and 251: ISO 9705 AND AS/NZS 3837These tests
Page 252 and 253: General InformationDesign of struct
Page 256 and 257: Results of recent tests organised b
Page 258 and 259: FlooringConstructionLVL(Substrates
Page 260 and 261: as expressed in the BCA.Species Ave
Page 262 and 263: ClosurePlywood Thickness for:Dougla
Page 264 and 265: Borers are rarely a problem with st
Page 266 and 267: HazardClassH1Exposure Specific serv
Page 268 and 269: 17.3 Durability and Finishing Appli
Page 270: EWPAA MembersPlywood and Laminated
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