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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
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Evaluation of log load wrappers made from larger diameter and jacketed synthetic ropes

https://library.fpinnovations.ca/en/permalink/fpipub53031
Author
Jokai, Rob
Date
September 2020
Material Type
Research report
Field
Fibre Supply
Author
Jokai, Rob
Date
September 2020
Material Type
Research report
Physical Description
12 p.
Sector
Forest Operations
Field
Fibre Supply
Research Area
Transportation Infrastructure
Subject
Transport
Logs
Mechanical properties
Polyethylene
Ropes
Safety
FPI TR
FOP Technical Report
Series Number
Technical Report ; TR 2020 n.28
Language
English
Abstract
This study tested ultra-high molecular weight polyethylene (UHMWPE) ropes for log load securement. Destructive testing of used rope samples done in a previous project found that the strength of these ropes decreased with use. To address this problem, the diameter of the synthetic rope was increased. In addition, a different type of rope with a UHMWPE inner core covered with a polyester protective jacket was tested. The outer jacket protected the inner core from dirt and abrasion which may help mitigate the loss in strength that occurs with use. Wrappers were put into service and tested for breakage after three and six months of use.
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Évaluation de câbles d'arrimage en fibre synthétique gainé de plus grand diamètre

https://library.fpinnovations.ca/en/permalink/fpipub53032
Author
Jokai, Rob
Date
Septembre 2020
Material Type
Research report
Field
Fibre Supply
Author
Jokai, Rob
Date
Septembre 2020
Material Type
Research report
Physical Description
13 p.
Sector
Forest Operations
Field
Fibre Supply
Research Area
Transportation Infrastructure
Subject
Transport
Logs
Mechanical properties
Polyethylene
Ropes
Safety
FPI TR
FOP Technical Report
Series Number
Technical Report ; RT 2020 n.28
Language
French
Abstract
Cette étude a évalué des câbles en polyéthylène de poids moléculaire ultra élevé (PEPMUE) pour sécuriser des chargements de billes. Des tests destructifs d'échantillons de câbles usagés effectués dans un projet précédent avaient révélé que la résistance de ces câbles diminuait avec l'utilisation. Pour résoudre ce problème, le diamètre du câble synthétique a été augmenté. De plus, un autre type de câble avec une âme intérieure en PEPMUE recouverte d'une gaine de protection en polyester a été testé. La gaine extérieure protégeait le câble intérieur de la saleté et de l'abrasion, ce qui peut aider à atténuer la perte de résistance qui se produit avec l'utilisation. Les câbles ont été mis en service et testés pour la résistance à la rupture après trois et six mois d'utilisation.
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