2006-07 Lumber properties program

https://library.fpinnovations.ca/en/permalink/fpipub1335
Author
Lum, Conroy
Date
March 2007
Edition
37816
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Lum, Conroy
Contributor
Canadian Forest Service
National Lumber Grades Authority
Date
March 2007
Edition
37816
Material Type
Research report
Physical Description
68 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Mechanical properties
Specifications
Grading
Specification
Series Number
5439
W-2383
Location
Vancouver, British Columbia
Language
English
Abstract
The Canadian lumber industry has identified, as a high priority, the establishment of a multi-year Lumber Properties Program that pulls together a number of urgent initiatives currently underway to establish and/or maintain Canadian lumber design values. The desire is to have an overall program that emphasizes the proper development of a longer-term strategic plan and process to deal with current and future initiatives. Combining the current industry resources with Federal Government contributions through Natural Resources Canada (NRCan), the first step in the Program has been completed: to gather the various initiatives now underway and to begin the formal development of pan-Canadian policies to guide the development, implementation and on-going maintenance of such initiatives. The key activities in 2006-07 were:
Launching of the pilot phase of the on-going monitoring program, and development of a simulation model to assist in determining what sort of trends can be reliably detected and which cannot;
Completion of the in-grade testing program on Canadian Norway spruce;
Analysis of the No.2 2x4 Hem-Fir (N) monitoring study and confirmation of the appropriateness of assigned design values;
Identification of an alternative species grouping procedure for further study;
Starting of a process under the ASTM Committee on Wood to address gaps in the Grade Quality Index provisions in ASTM Practice D1990, and
Establishing a forum for engaging the US in discussions on lumber properties issues. Lumber properties issues crucial to maintaining the competitiveness of Canadian lumber continue to be the same as in previous years: tests and means to adjust for sample representativeness using the Grade Quality Index (GQI), species grouping and re-grouping procedures, and on-going lumber monitoring. As a result, discussion on a pan-Canadian strategy and supporting policies necessary to support Canadian lumber initiatives tend to focus on these three issues. The challenge is to ensure that these issues are dealt with in a way that balances both short and longer-term needs and provides a net overall benefit to the Canadian industry.
Grading - Lumber - Specifications
Lumber Strength
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An Integrated torsion-bending vibration test method for monitoring waferboard strength properties

https://library.fpinnovations.ca/en/permalink/fpipub38404
Author
Lau, P.W.C.
Tardif, Y.G.
Date
March 1990
Material Type
Research report
Field
Sustainable Construction
information on the mechanical properties of these panels. Recently, this need was made more acute because
Author
Lau, P.W.C.
Tardif, Y.G.
Date
March 1990
Material Type
Research report
Physical Description
24 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Waferboard testing
Waferboards
Test methods
Mechanical properties
Series Number
CFS project no.12
4310M031
E-1211
Location
Ottawa, Ontario
Language
English
Abstract
Waferboard - Test Method
Waferboard - Strength Properties
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Apparatus for duration of load compression tests of dimension lumber

https://library.fpinnovations.ca/en/permalink/fpipub5460
Author
Samson, M.
Olson, S.L.
Date
March 1985
Edition
37007
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Samson, M.
Olson, S.L.
Date
March 1985
Edition
37007
Material Type
Research report
Physical Description
10 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Strength load bearing
Compression
Mechanical properties
Picea
Loads
Series Number
CFS Contract 02-50-65-593
W-211
Location
Vancouver, British Columbia
Language
English
Abstract
Picea glauca - Strength
Strength - Compression - Parallel to grain
Strength - Load bearing - Influence of duration
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Assessment of heat-treated jack pine and balsam fir

https://library.fpinnovations.ca/en/permalink/fpipub5324
Author
Lihra, T.
Date
May 2003
Edition
42198
Material Type
Research report
Field
Sustainable Construction
durability should be observed. However, some mechanical properties of the wood may have decreased
Author
Lihra, T.
Contributor
Canada. Canadian Forest Service
Date
May 2003
Edition
42198
Material Type
Research report
Physical Description
17 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Treatment
Mechanical properties
Heat
Series Number
CFS Value-Added Report 3675
Location
Sainte-Foy, Québec
Language
English
Abstract
Industrial heat treatment technology for wood has been under development since the 1970s. The technology consists in heating wood to temperatures of from 150°C to 240°C while preventing it from burning. This is achieved by heating the wood in either an inert atmosphere or saturated vapour environment. Heating the wood over 200°C changes the chemical structure of the wood and results in a reduction in its hydrophilic behaviour. After heat treatment when wood colour has changed to brown, an improvement in dimensional stability and biological durability should be observed. However, some mechanical properties of the wood may have decreased. This enhanced dimensional stability and biological durability make heat treatment an interesting option for the protection of wood used in exterior applications. The objectives of this study are to assess the performance of heat treatment technologies and to determine the properties of jack pine and balsam fir after heat treatment, as regards to exterior applications. Owing to difficulties in the start-up period that significantly delayed the project, no experimental work had been conducted by the end of March 2003. The lumber has however been sent to two companies for treatment and the physical and mechanical tests will be conducted under a new project entitled “Quality Control and Certification of Thermally Modified Wood.” A final report will be issued at the end of March 2004.
Heat treatment, Effect on mechanical properties
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Basic wood properties of second-growth sitka spruce

https://library.fpinnovations.ca/en/permalink/fpipub5534
Author
Jozsa, Les A.
von Schilling, B.
Sen, P.
Date
January 1993
Edition
37459
Material Type
Research report
Field
Sustainable Construction
Author
Jozsa, Les A.
von Schilling, B.
Sen, P.
Contributor
British Columbia. Ministry of Forests. Queen Charlotte Forest District.
Date
January 1993
Edition
37459
Material Type
Research report
Physical Description
38 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Second growth
Picea
Physical properties
Mechanical properties
Growth
Series Number
W-1446
Location
Vancouver, British Columbia
Language
English
Abstract
The basic wood properties of 45-year-old second-growth sitka spruce were examined to determine if rapid growth produces poor wood quality. Five dominant and codominant trees were sampled from each of four stands with stocking densities of 520, 640, 1080, and 1520 stems/ha. Stem size, extent of live crown, yearly wood relative density trends, and longitudinal shrinkage were measured.
Picea sitchensis - Mechanical properties
Picea sitchensis - Physical properties
Second growth
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Bearing strength of hem-fir

https://library.fpinnovations.ca/en/permalink/fpipub1006
Author
Lum, Conroy
Date
March 1995
Edition
37383
Material Type
Research report
Field
Sustainable Construction
Author
Lum, Conroy
Contributor
Canada. Canadian Forest Service.
Date
March 1995
Edition
37383
Material Type
Research report
Physical Description
2 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Strength load bearing
Mechanical properties
Loads
Series Number
W-1216
Location
Vancouver, British Columbia
Language
English
Abstract
Higher bearing strength values for Hem-Fir, where justified, will allow designers to realise the full strength potential of the lumber. Machine stress rated (MSR) lumber would benefit the most from an increase in the Hem-Fir bearing strength. Although there are few Hem-Fir MSR lumber producers, it is anticipated that given the recent or planned increase in installed kiln capacity on the west coast, more mills will be considering producing MSR lumber. Acceptance of Hem-Fir MSR lumber in the marketplace will depend on the design values assigned to Hem-Fir MSR lumber. The objective of this project is to establish characteristic bearing strength values for the Hem-Fir species group in CSA O86.1 and progress to date is described.
Strength - Load bearing
Hem-fir - Strength
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Behavior of composite lumber under long-term loading

https://library.fpinnovations.ca/en/permalink/fpipub1764
Author
Alexopoulos, J.
Shields, J.A.
Date
March 1982
Edition
38281
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Alexopoulos, J.
Shields, J.A.
Date
March 1982
Edition
38281
Material Type
Research report
Physical Description
24 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Testing
Composites
Structural composites
Mechanical properties
Series Number
3-55-43-306
E-943
Location
Ottawa, Ontario
Language
English
Abstract
Composite Structural Members - Testing
Structural Composites - Strength
Documents
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Behaviour of waferboard floor sheating under concentrated and impact loads

https://library.fpinnovations.ca/en/permalink/fpipub2338
Author
Szabo, T.
Date
June 1981
Edition
38900
Material Type
Research report
Field
Sustainable Construction
Author
Szabo, T.
Date
June 1981
Edition
38900
Material Type
Research report
Physical Description
15 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Mechanical properties
Series Number
CFS/DSS project no 10/80-81
DSS o5ss KL 229-0-4143
Location
Ottawa, Ontario
Language
English
Abstract
Floors - Strength - Impact
Documents
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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
Documents
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Bending strength and stiffness of log stringers for bridges on forest roads: tests of second-growth Douglas-fir and western hemlock logs

https://library.fpinnovations.ca/en/permalink/fpipub5843
Author
Bennett, Douglas M.
Modesto, R.
Ewart, Jim
Jokai, Rob
Parker, Seamus
Clark, Marv
Date
January 2005
Edition
40689
Material Type
Research report
Field
Fibre Supply
Author
Bennett, Douglas M.
Modesto, R.
Ewart, Jim
Jokai, Rob
Parker, Seamus
Clark, Marv
Date
January 2005
Edition
40689
Material Type
Research report
Physical Description
19 p
Sector
Forest Operations
Field
Fibre Supply
Research Area
Transportation Infrastructure
Subject
Test methods
Mechanical properties
Second growth
Ruptures
Procedures
Logs
Sample
Growth
Design
British Columbia
Bending
Advantage
Series Number
Advantage ; Vol. 5, No. 42
Language
English
Abstract
In order to provide bridge designers with better information, International Forest Products Limited (Interfor) asked the Forest Engineering Resarach Institute of Canada (FERIC) to evaluate the bending strength and stiffness of log stringers used for constructing bridges on forest roads in coastal British Columbia. Given the lack of definitive standards for testing this material, FERIC developed a field-based test procedure and designed a test facility for destructive testing of full-size, whole-log stringers obtained from second-growth stands. Sixteen coastal Douglas-fir and twelve western hemlock logs were tested in 2003. This report describes the test procedure and methods of analysis, presents the log bending strength and stiffness results, and makes recommendations regarding future testing.
Bridge design
Log stringers
Bending strength
Modulus of rupture
Modulus of elasticity
Test procedure
Second-growth logs
Douglas fir
Western hemlock
Coastal British Columbia
Documents
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