name:"Palka, L.C." found 35 records | Research Library

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

Documents

209.pdf

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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

Documents

208.pdf

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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

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213.pdf

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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