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Effect of on-line tension proof parameters on fingerjoined lumber performance

https://library.fpinnovations.ca/en/permalink/fpipub37959
Author
Pirvu, Ciprian
Date
March 2009
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Pirvu, Ciprian
Date
March 2009
Material Type
Research report
Physical Description
87 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Mechanical properties
Joints
Series Number
Value to Wood No. FCC 021W
W-2668
Location
Vancouver, British Columbia
Language
English
Abstract
Tension proof loading has been shown to be effective in eliminating low-strength fingerjoints, and a proof load stress level of 1.3 times the allowable stress value was found to be optimum. This confirms the tension proof loading stress requirement of the Canadian National Lumber Grades Authority (NLGA) for fingerjoined lumber. Proof loading stress levels were chosen at 1.0, 1.3 and 1.6 times the allowable stress, and loading rates were selected so that target stress was attained in 0.2, 6.0 or 60 seconds. The only effect of loading rate was a small increase in strength values for weaker specimens when tested at faster loading rates, along with increased variability; therefore, it is strongly recommended that very fast loading rates be avoided, and a loading rate be chosen so the desired stress level is attained in about one second. FPInnovations – Forintek performed this two-year study to provide a sound basis for evaluation of the tension proof-loading of fingerjoined lumber. The findings will be useful to the fingerjoined-lumber industry in refining the process and promoting its benefits to end users and regulators.
Glued joints - Finger - Strength
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Load duration test protocols for engineered wood products

https://library.fpinnovations.ca/en/permalink/fpipub37951
Author
Pirvu, Ciprian
Date
March 2009
Material Type
Research report
Field
Sustainable Construction
Author
Pirvu, Ciprian
Contributor
Canada. Canadian Forest Service.
Date
March 2009
Material Type
Research report
Physical Description
12 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Mechanical properties
Materials
Building construction
Series Number
Canadian Forest Service No. 4
W-2653
Location
Vancouver, British Columbia
Language
English
Abstract
The objective of the project is to develop/improve practical, reliable and internationally recognized methods for assessing/pre-screening the long-term structural performance of engineered wood products used in residential and non-residential applications.
Building construction - Materials used - Strength
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