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An examination of property relationships in the Canadian machine stress rated lumber in-grade program Griffin, Annie Helen
Abstract
The Canadian lumber industry undertook two large-scale test programs for the verification of lumber design properties of Canadian species combinations. The visual lumber in-grade test program was begun in 1983 (with a prior program undertaken in 1975), while a similar program for machine graded lumber (MSR lumber) was undertaken in 1988. Some of the results of the MSR lumber in-grade test program are examined in this thesis. Stiffness and strength results from the visual lumber in-grade program are used for comparison, as are values from the MSR lumber standard. The importance of differences in methods of testing properties, particularly Modulus of Elasticity (MOE), is shown. Differences in results occur due to changes in the test span to depth ratios, measurement techniques and location of defects. The importance of knots as a cause of failure in both bending and tension is examined. The high incidence of lumber failures initiating at points where no defect was visible to the human eye is also studied.
Item Metadata
Title |
An examination of property relationships in the Canadian machine stress rated lumber in-grade program
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1994
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Description |
The Canadian lumber industry undertook two large-scale test
programs for the verification of lumber design properties of
Canadian species combinations. The visual lumber in-grade test
program was begun in 1983 (with a prior program undertaken in
1975), while a similar program for machine graded lumber (MSR
lumber) was undertaken in 1988. Some of the results of the MSR
lumber in-grade test program are examined in this thesis.
Stiffness and strength results from the visual lumber in-grade
program are used for comparison, as are values from the MSR
lumber standard.
The importance of differences in methods of testing
properties, particularly Modulus of Elasticity (MOE), is
shown. Differences in results occur due to changes in the test
span to depth ratios, measurement techniques and location of
defects.
The importance of knots as a cause of failure in both bending
and tension is examined. The high incidence of lumber failures
initiating at points where no defect was visible to the human
eye is also studied.
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Extent |
18209753 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-03-02
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0075182
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1994-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.