Presentation is loading. Please wait.

Presentation is loading. Please wait.

Taxonomy of Wood Products Engineered Wood Products.

Similar presentations


Presentation on theme: "Taxonomy of Wood Products Engineered Wood Products."— Presentation transcript:

1 Taxonomy of Wood Products Engineered Wood Products

2 WOOD CompositesSolid WoodPulp and Paper Panels Engineered Lumber Composites Softwood Lumber Wood/Non- wood Wood Based Wood/Cement Wood/Plastic Particleboard MDF Plywood OSB LVL OSL Glulam HardwoodTreatedGlued Finger joined Edge glued PulpPaper Mechanical Chemical Boards Dimension Timber MSR Secondary Wood Products Furniture Cabinets Windows & Doors Millwork & Factory-built Housing Wood Products Taxonomy Engineered Wood Products I -Beams Trusses CLT

3 Solid wood products Engineered wood products

4 Choice of Wood Products Relative strength rating ? (a) or (b) Product composition ? (a) one large piece of solid wood or (b) smaller pieces wood glued together 4

5 Engineered wood products - benefits compared to solid wood More reliable Higher strength ratings Larger dimensions possible Smaller trees can be utilized

6 Variability in wood products frequency strength Solid wood 6

7 Variability in wood products frequency strength Solid wood lower 5 th percentile mean 7 ÷ safety factors allowable design stress

8 Variability in wood products frequency strength Solid wood lower 5 th percentile mean ÷ safety factors allowable design stress lower 5 th percentile ÷ safety factors Wood composite A mean 8

9 Variability in wood products frequency strength Solid wood lower 5 th percentile ÷ safety factors allowable design stress lower 5 th percentile ÷ safety factors mean Wood composite B mean 9

10 Solid wood vs. Engineered lumber composite Which is “stronger”? strength frequency “Stronger” = “Can accept higher design loads” 10 Solid wood Wood composite

11 Reduction of natural variability Initial source of solid wood Wood source reduced to designed elements Elements combined into more consistent engineered products Strategic placement of elements 11

12 Strands Veneer sheets Veneer strips Lamstock Wood Elements

13 WOOD CompositesSolid WoodPulp and Paper Panels Engineered Lumber Composites Softwood Lumber Wood/Non- wood Wood Based Wood/Cement Wood/Plastic Particleboard MDF Plywood OSB LVL OSL Glulam HardwoodTreatedGlued Finger joined Edge glued PulpPaper Mechanical Chemical Boards Dimension Timber MSR Secondary Wood Products Furniture Cabinets Windows & Doors Millwork & Factory-built Housing Engineered Wood Products I -Beams Trusses Wood Products Taxonomy

14 Laminated Veneer Lumber Elements:Sheets of wooden veneer (1/8-1/10” thick, 2’ wide, 8’ long) ProductWidth1½ - 3½ inches Dimensions:Depthup to 24 inches Lengthup to 80 feet Applications:Beams, headers, I -beam flange 14

15 LVL – manufacturing overview

16 Laminated Veneer Lumber (LVL)  Softwood veneers produced as in plywood production  Veneers graded prior to assembly  Higher quality veneers are placed on the outsides  Veneers glued with grain running parallel to each other  LVL used on flat ( I -beam flanges) or on edge (beams, headers) 16 Edge Flat

17 LVL – end use dimensions Width1 ½ in., 1 ¾ in., and 3 ½ in. Depthup to 24 in. Lengthup to 24m

18 Laminated Veneer Lumber Variability is reduced in one plane. Solid wood Variability is at its greatest level. Reduction of natural variability Defects in veneer can be removed or dispersed Variability is reduced Yield of veneer from logs is higher than yield of solid lumber 18

19 Laminated Veneer Lumber LVL beam LVL in I -beam 19

20 LVL - headers

21 Glue Laminated Timber (Glulam) Elements:“Lamstock”, high quality dimension lumber (1½” thick, up to 10” wide, up to 20’ long) ProductWidth3½-14 inches Dimensions:Depthup to 8 feet Lengthup to 140 feet Applications:Beams, columns, arches, trusses 21

22 Centre for Advanced Wood Processing

23 Glulam - laminations Top and bottom laminations might be different species Finger joints along laminations Total dimensions = 5.25” x 17.5” (This is not a commercial sample)

24 Multiple laminations Mulitple pieces per width of lamination Glulam – build up of column

25 Glue Laminated Lumber (Glulam)  Individual lamstock elements are stress-rated prior to beam fabrication  Stiffer elements are placed in more critical locations in member  Very large dimensions possible 25

26 Glue Laminated Lumber (Glulam)  Curved members can be created  Tighter curves require thinner laminations  Architectural as well as structural 26

27 Glulam - Columns, Beams and Rafters 27

28 Glulam - Roof Beams 28

29 Glulam - Curved Roof Beams 29

30 Glulam - Curved Bridges 30

31 Glulam – curved members


Download ppt "Taxonomy of Wood Products Engineered Wood Products."

Similar presentations


Ads by Google