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35 records – page 1 of 4.

Bending modulus of elasticity and strength of 1.75" x 3.5" x 96" Douglas-fir microlam and spruce specimens

https://library.fpinnovations.ca/en/permalink/fpipub5495
Author
Palka, L.C.
Rovner, B.
Olson, L.
Wakeman, R.G.
Walser, D.C.
Date
March 1991
Edition
37257
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Palka, L.C.
Rovner, B.
Olson, L.
Wakeman, R.G.
Walser, D.C.
Date
March 1991
Edition
37257
Material Type
Research report
Physical Description
12 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Veneer
Mechanical properties
Laminate product
Series Number
Appendix 2 to Forestry Canada No. 35
Contract no. 1812L007
W-874
Location
Vancouver, British Columbia
Language
English
Abstract
The purpose of this small study was to examine the effect of various test methods upon the bending moduli of elasticity and to determine the bending strength of selected Douglas-fir and spruce laminated veneer lumber specimens.
Lumber, Laminated veneer - Strength
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Bending strength properties of incised and preservative treated commercial 2 x 4 western softwood lumber

https://library.fpinnovations.ca/en/permalink/fpipub924
Author
Palka, L.C.
Morris, Paul I.
Walser, D.C.
Date
March 1992
Edition
37284
Material Type
Research report
Field
Sustainable Construction
Author
Palka, L.C.
Morris, Paul I.
Walser, D.C.
Date
March 1992
Edition
37284
Material Type
Research report
Physical Description
28 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Preservation
Mechanical properties
Series Number
Forestry Canada No. 4
Contract no. 1712K007
W-937
Location
Vancouver, British Columbia
Language
English
Abstract
This study evaluated the effect of two different incisors followed by chromated copper arsenate pressure treatment on the bending strength and stiffness of No. 2 and better nominal 2 x 4 inch (38 x 89 mm) spruce-pine-fir and hem-fir lumber. The double-density incising method, developed at Forintek, allows SPF to meet the CSA O80 wood preservation standards. The high-speed incisor was developed by Forintek for operation immediately behind the planer in a sawmill to produce a treatable lumber product. The prototype tested here employed two solid rollers to lay down two superimposed patterns of incisions at a density of 17500/m2. Approximately 2900 specimens of SPF and 1200 specimens of hem-fir were sorted into nine and four matched groups, respectively, according to their average flatwise modulus of elasticity values tested in centre point bending. The matched groups were then given various combinations of drying, incising and pressure treatments. Bending strength properties were tested. It was found that kiln-dried SPF and green hem-fir commercial dimension lumber, treated by the above processes, can be safely used for all structural purposes for which preservative treatment is required.
Preservation - Influence on mechanical properties
Preservation - Incising
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Conformance testing of visually graded lumber : technical and statistical options

https://library.fpinnovations.ca/en/permalink/fpipub37407
Author
Palka, L.C.
Cook, Jean A.
Date
March 1988
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Palka, L.C.
Cook, Jean A.
Date
March 1988
Material Type
Research report
Physical Description
18 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Wood quality
Wood
Testing
Mechanical properties
Quality control
Qualitative analysis
Grading
Series Number
W-1305
Location
Vancouver, British Columbia
Language
English
Abstract
Conformance testing and grade verification are technically and economically complex problems. In response to an industrial request, two alternative approaches helpful for maintaining or increasing the market share of dimension lumber in residential or industrial/commercial structures have been considered. Two options were suggested for conformance sampling of commercially important lumber grades, sizes and species. One, based on a single large sample, that would allow immediate up-dating of strength properties, if needed. The other, based on a small initial sample, followed by a larger second sample, if needed. Appropriate decision rules were developed, and it was recommended that sampling and strength testing procedures for conformance evaluations be identical to those used for in-grade testing of lumber. Development and calibration of an economic model for assessing the costs of non-conformance was also recommended. A synthesis of results from the proposed initial conformance testing based on two-stage sequential sampling and from the economic analyses is needed for rational recommendations concerning near-optimum procedures of future conformance testing of visually graded dimension lumber. Specific actions should follow discussions with, and recommendations or requests from, representatives of the lumber industry.
Grading - Lumber
Strength - Tests
Wood quality - Exterior indications
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Creep and creep-rupture behaviour of wood-based structural panels

https://library.fpinnovations.ca/en/permalink/fpipub5502
Author
Laufenberg, T.L.
Palka, L.C.
McNatt, J.D.
Date
February 1994
Edition
37293
Material Type
Research report
Field
Sustainable Construction
Author
Laufenberg, T.L.
Palka, L.C.
McNatt, J.D.
Date
February 1994
Edition
37293
Material Type
Research report
Physical Description
45 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Mechanical properties
Panels
Series Number
W-975
Location
Vancouver, British Columbia
Language
English
Abstract
The highlights of a co-operative research program developed by the U.S. Forest Products Laboratory (FPL) and Forintek Canada Corp. to provide detailed creep-rupture and some creep information for composite panel products are summarized here. Support for this program has been provided by the American Plywood Association, The Waferboard Association (now the Structural Board Association), as well as the U.S. and Canadian Forest Services. Commercially produced plywood, oriented strandboard (OSB), and waferboard were tested to identify three mills that produced panels with high, low and median flexural creep performance. These three plywood, three OSB, and three waferboard products were then extensively tested to provide information on their duration of load and creep performance.
Creep
Panels - Strength
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Development of a high performance OSB panel : revised 1995 addendum

https://library.fpinnovations.ca/en/permalink/fpipub5519
Author
Palka, L.C.
Karacabeyli, Erol
Stroh, L.
Date
May 1996
Edition
37404
Material Type
Research report
Field
Wood Manufacturing & Digitalization
strandboard. Preprint. 1991 International Timber Engineering Conference, London, England, UK. Palka, L.C
Author
Palka, L.C.
Karacabeyli, Erol
Stroh, L.
Date
May 1996
Edition
37404
Material Type
Research report
Physical Description
37 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Flakeboards
Waferboards
Mechanical properties
Strandboards
Oriented strandboard
Orientation
Series Number
W-1297
Location
Vancouver, British Columbia
Language
English
Abstract
This addendum completes the presentation of the data and research findings for the project entitled "Development of a high performance OSB panel." Most of the short-term test results and preliminary long-term creep data were summarized in a previous report (Project No. 38-43-M-410) which was submitted to the Canadian Forest Service. This addendum to that report includes new data on rolling shear, revised data on shear-through-thickness, and creep data collected during a load duration of nine months, followed by a three-week creep recovery. In addition, the effects of parameters such as strand length and climatic conditions on the engineering properties are discussed for OSB, waferboard, and plywood panels. Utilization of long strands improved the majority of the properties of OSB panels produced with commercial strands. This improvement, however, was not observed for the OSB panels produced with laboratory strands.
Waferboard and Flakeboard - Strength
Oriented strandboard - Strength
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Duration of load effects for 2 x 4 spruce in compression parallel to grain : first data report

https://library.fpinnovations.ca/en/permalink/fpipub5459
Author
Palka, L.C.
Samson, M.
Hejja, A.
Date
March 1985
Edition
37006
Material Type
Research report
Field
Sustainable Construction
Author
Palka, L.C.
Samson, M.
Hejja, A.
Date
March 1985
Edition
37006
Material Type
Research report
Physical Description
18 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Strength load bearing
Compression
Mechanical properties
Picea
Loads
Series Number
CFS Contract 02-50-65-593
W-209
Location
Vancouver, British Columbia
Language
English
Abstract
Picea glauca - Strength
Strength - Load bearing - Influence of duration
Strength - Compression - Parallel to grain
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Duration of load effects for 2 x 4 spruce lumber in bending

https://library.fpinnovations.ca/en/permalink/fpipub5458
Author
Palka, L.C.
Samson, M.
Hejja, A.
Date
March 1985
Edition
37005
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Palka, L.C.
Samson, M.
Hejja, A.
Date
March 1985
Edition
37005
Material Type
Research report
Physical Description
14 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Bending
Mechanical properties
Picea
Series Number
CFS Contract 02-50-65-594
W-208
Location
Vancouver, British Columbia
Language
English
Abstract
Picea glauca - Strength
Strength - Bending - Tests
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Duration of load effects for 2 x 4 spruce lumber in tension : Data report - Second year

https://library.fpinnovations.ca/en/permalink/fpipub5461
Author
Palka, L.C.
Samson, M.
Hejja, A.
Date
March 1985
Edition
37008
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Palka, L.C.
Samson, M.
Hejja, A.
Date
March 1985
Edition
37008
Material Type
Research report
Physical Description
21 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Tension
Strength load bearing
Mechanical properties
Picea
Loads
Series Number
CFS Contract 02-50-65-588
W-213
Location
Vancouver, British Columbia
Language
English
Abstract
Picea glauca - Strength
Strength - Tension - Tests
Strength - Load bearing - Influence of duration
Documents
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Duration of load effects for Canadian panel products: basic considerations - progress report

https://library.fpinnovations.ca/en/permalink/fpipub37252
Author
Palka, L.C.
Date
February 1991
Material Type
Research report
Field
Sustainable Construction
Author
Palka, L.C.
Date
February 1991
Material Type
Research report
Physical Description
42 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Strength load bearing
Mechanical properties
Panels
Loads
Series Number
Forestry Canada No. 20;5410K022
W-869
Location
Vancouver, British Columbia
Language
English
Abstract
Technical information needed for the reliable and expanded structural use of commercial panel products alone or as components of composite structural elements have been identified. In addition, alternative models used for describing the creep and creep-rupture of wood and wood-based panels have been reviewed, and their advantages and limitations have been discussed. Finally both short and long term research needs have been considered, and possible action plans have been suggested.
Panels - Strength
Strength - Load bearing - Influence of duration
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Effect of incising and pressure preservative treatments upon selected strength properties of commercial dimension lumber

https://library.fpinnovations.ca/en/permalink/fpipub40985
Author
Palka, L.C.
Barrett, J.D.
Ruddick, J.N.R.
Date
May 1984
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Palka, L.C.
Barrett, J.D.
Ruddick, J.N.R.
Date
May 1984
Material Type
Research report
Physical Description
69 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Wood foundations
Wood
Preserved wood
Preservation
Mechanical properties
Series Number
CFS Contract 02-50-68-584
W-206
Location
Vancouver, British Columbia
Language
English
Abstract
Preserved wood foundations
Preservation - Incising
Preservation - Influence on mechanical properties
Documents
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35 records – page 1 of 4.