wood products 2013w engineered wood products a 2

7/25/2019 Wood Products 2013W Engineered Wood Products a 2

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Taxonomy of Wood Products

Engineered Wood Products


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WOOD

Composites Solid Wood Pulp and Paper

PanelsEngineered

Lumber

Composites

Softwood

Lumber

Wood/Non-

woodWood Based

Wood/Cement

Wood/Plastic

Particleboard

D!

Pl"wood

OSB

L#L

OSL

$lulam

%ardwood&reated$lued

!inger 'oined

Edge glued

Pulp Paper

ec(anical

C(emical

Boards

Dimension

&imber

S)

Secondar"

Wood Products

!urniture

illwor* + !actor"-built

%ousing

Windows + Doors

Cabinets

Wood Products Taxonomy

Engineered Wood

Products

I-Beams

&russes

CL&


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Solid wood products Engineered wood products


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Choice of Wood Products

Relative strength rating ?

a! "#$%#

or

&! #'$(''

Product composition ?

a! one large piece of solid wood

or

&! smaller pieces wood glued together

)


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Engineered wood products

$ &enefits compared to solid wood

*ore relia&le

+igher strength ratings

,arger dimensions possi&le

Smaller trees can &e utili-ed


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.aria&ility in wood products

fre/uency

strength

Solid wood

0


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fre/uency

strength

Solid woodlower #thpercentile

mean

"

1 safety factors

allowable design stress


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fre/uency

strength

Solid woodlower #thpercentile

mean

1 safety factors



lower #thpercentile

1 safety factors

Wood composite 2

mean

%


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fre/uency

strength

Solid wood

lower #thpercentile

1 safety factors



lower #thpercentile

1 safety factors

mean

Wood composite 3

mean

4


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Solid wood vs5 Engineered lum&er composite

Which is 6stronger7?

strength

fre/uency

6Stronger7 8 6Can accept higher design loads7

('

Solid wood

Wood composite


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Reduction of natural varia&ility

9nitial source of

solid wood

Wood source

reduced to

designed

elements

Elements com&ined

into more consistent

engineered products

Strategic

placement

of elements

((


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Strands.eneer sheets

.eneer strips ,amstoc:

Wood Elements


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WOOD

Composites Solid Wood Pulp and Paper

PanelsEngineered

LumberComposites

SoftwoodLumber

Wood/Non-wood

Wood Based

Wood/Cement

Wood/Plastic

Particleboard

D!

Pl"wood

OSB

L#L

OSL

$lulam

%ardwood&reated$lued

!inger 'oined

Edge glued

Pulp Paper

ec(anical

C(emical

Boards

Dimension

&imber

S)

Secondar"

Wood Products

!urniture

illwor* + !actor"-built

%ousing

Windows + Doors

Cabinets

Wood Products Taxonomy


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,aminated .eneer ,um&er

Elements; Sheets of wooden veneer

(


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,., manufacturing overview

(

>

A)#

0


16/31

,aminated .eneer ,um&er ,.,!

Softwood veneers produced as in plywood production

.eneers graded prior to assem&ly +igher /uality veneers are placed on the outsides

.eneers glued with grain running parallel to each other

,., used on flat I$&eam flanges! or on edge &eams=

headers! (0

Edge

Dlat


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,., end use dimensions

Width ( @ in5= ( in5= and A @ in5

Bepth up to >) in5

,ength up to >)m


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,aminated .eneer,um&er

.aria&ility is reduced

in one plane5

Solid wood

.aria&ility is at its

greatest level5

Reduction of natural varia&ility

Befects in veneer can &e removed or dispersed .aria&ility is reduced

Field of veneer from logs is higher than yield of solid

lum&er

(%


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,aminated .eneer ,um&er

,., &eam,., in I$&eam

(4


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,., $ headers


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Glue ,aminated Tim&er Glulam!

Elements; 6,amstoc:7= high /uality dimension lum&er

(@7 thic:= up to ('7 wide= up to >' long!

Product Width A@$() inchesBimensions; Bepth up to % feet

,ength up to ()' feet

2pplications; 3eams= columns= arches= trusses>(

Individuallaminations

Finger joint


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Centre for 2dvanced Wood Processing


23/31

Glulam $ laminations

Top and &ottom laminations

might &e different species

Dinger Hoints along laminations

Total dimensions 8 #5>#7 x ("5#7

This is not a commercial sample!


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*ultiple

laminations

*ulitplepieces per

width of

lamination

Glulam &uild up of column


25/31

Glue ,aminated ,um&er Glulam!

9ndividual lamstoc: elements are stress$rated

prior to &eam fa&rication

Stiffer elements are placed in more critical locations

in mem&er

.ery large dimensions possi&le

>#
http://1.bp.blogspot.com/-y1d4nUqD1Bg/TWUewEGbZgI/AAAAAAAAA_M/1KFVIYe4-sM/s1600/100_0373.2.jpg


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Glue ,aminated ,um&er Glulam!

Curved mem&ers can &e created

Tighter curves re/uire thinner laminations

2rchitectural as well as structural

>0


27/31

Glulam $ Columns= 3eams and Rafters

>"


28/31

Glulam $ Roof 3eams

>%


29/31

Glulam $ Curved Roof 3eams

>4


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Glulam $ Curved 3ridges

A'


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Glulam curved mem&ers
http://1.bp.blogspot.com/-y1d4nUqD1Bg/TWUewEGbZgI/AAAAAAAAA_M/1KFVIYe4-sM/s1600/100_0373.2.jpghttp://2.bp.blogspot.com/-cjskR3cxhbs/TWUd230xuFI/AAAAAAAAA_E/GNlyZVJJbxI/s1600/DSC_8488.jpg

wood products 2013w engineered wood products a 2

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