Skip header and navigation

4 records – page 1 of 1.

Impact of relaxed log grade specifications and multi-stem processing on value recovery from dead lodgepole pine stands

https://library.fpinnovations.ca/en/permalink/fpipub49808
Author
Lehmann, Bruce F.
Date
October 2015
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Lehmann, Bruce F.
Date
October 2015
Material Type
Research report
Physical Description
28 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Digitalization
Subject
Lumber strength
Wood
Beams
Strength
Lumber
Language
English
Abstract
This study develops and tests a simple model for the effect of knots on MOR: assuming that a knot is hole in the cross-section of a board a strength ratio is calculated and the MOR is the product of the strength ratio and the strength (MOR) of clear wood. This knot model is based on the stresses being in the elastic range and ignores the effect of grain angle and the orthotropic properties of wood and so should not accurately predict either loads for initial failure or the loads at final failure, on which MOR is based. However, the predicted values of MOR for SPF and Douglas fir compare well to measured values. This lead to the conclusion that while the model is physically wrong, the results imply that the strength ratio of the knot model are related to the strength ratio at final failure, which usually occurs at the end of a crack that starts at the knot but propagates some distance along the board. A model for the strength of the remaining section at the end of the crack was developed and tested on six boards. Not only were the strength ratios for the remaining section model similar to those of the knot model, but the remaining section model predicted MOR values closer to the measured values than the knot model did. The task of future work is to predict the location of the initial crack, the path that it propagates and the strength of the clear wood.
Documents
Less detail

Analysis of full-scale fire-resistance tests of structural composite lumber beams

https://library.fpinnovations.ca/en/permalink/fpipub3316
Author
Dagenais, Christian
Date
October 2014
Edition
39980
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Dagenais, Christian
Contributor
Canadian Forest Service
Date
October 2014
Edition
39980
Material Type
Research report
Physical Description
14 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Fire
Resistance
Testing
Structural composites
Beams
Series Number
E 4914
Location
Québec, Québec
Language
English
Abstract
The key objective of this study is to analyze full-scale fire-resistance tests conducted on structural composite lumber (SCL), namely laminated veneer lumber (LVL), parallel strand lumber (PSL) and laminated strand lumber (LSL). A sub-objective is to evaluate the encapsulation performance of Type X gypsum board directly applied to SCL beams and its contribution to fire-resistance of wood elements. The test data is being used to further support the applicability of the newly developed Canadian calculation method for mass timber elements, recently implemented as Annex B of CSA O86-14.
Structural Composites - Properties
Beams - Fire resistance
Documents
Less detail

Tests for commercial production for borate-treated glulam

https://library.fpinnovations.ca/en/permalink/fpipub5609
Author
Feng, Martin
Andersen, Axel W.
Date
April 2007
Edition
37822
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Feng, Martin
Andersen, Axel W.
Date
April 2007
Edition
37822
Material Type
Research report
Physical Description
22 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Prevention
Preservatives boron
Preservatives
Preservation
Laminate product
Beams
Series Number
Value to Wood no. FCC 82i
5413
W-2399
Location
Vancouver, British Columbia
Language
English
Abstract
This project was to complete the link from research to commercial production of borate-treated glulam, a value-added new product with appealing performance characteristics in the areas of fire-resistance, mold, insects and decay. The objectives of this project were to eliminate the impediments to commercial production that were identified in a previous project, and provide needed information on strength characteristics of borate-treated lumber compared to untreated lumber.
Laminated products - Preservation
Preservatives - Boron
Beams - Laminated - Preservation
Moulds - Prevention
Documents
Less detail

Built-up composite beams

https://library.fpinnovations.ca/en/permalink/fpipub1743
Author
Jones, E.
Szabo, T.
Date
July 1980
Edition
38260
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Jones, E.
Szabo, T.
Date
July 1980
Edition
38260
Material Type
Research report
Physical Description
13 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Testing
Materials tests
Materials
Beams
Series Number
CFS project 10/1980-81
E-868
Location
Ottawa, Ontario
Language
English
Abstract
Beams - Composite - Testing
Composite materials - Testing
Documents
Less detail