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Acoustic Impact Testing and Waveform Analysis for Damage Detection in Glued Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue771
Year of Publication
2017
Topic
Acoustics and Vibration
Serviceability
Material
Glulam (Glue-Laminated Timber)
Application
General Application

Identifying Incipient Decay in Douglas-fir Bridge Components using X-Ray Computerized Tomography

https://research.thinkwood.com/en/permalink/catalogue2350
Year of Publication
2019
Topic
Design and Systems
Moisture
Serviceability
Material
Glulam (Glue-Laminated Timber)
Solid-sawn Heavy Timber
Application
Bridges and Spans
Author
Senalik, Christopher
Wacker, James
Wang, Xiping
Wu, Xi
Year of Publication
2019
Country of Publication
United States
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Solid-sawn Heavy Timber
Application
Bridges and Spans
Topic
Design and Systems
Moisture
Serviceability
Keywords
X-ray Computerized Tomography
Wood Timber
Brown Rot Fungus
Incipient Decay
Language
English
Conference
International Nondestructive Testing and Evaluation of Wood Symposium
Research Status
Complete
Summary
In this report, wooden members of sizes typically used in bridge construction are examined using x-ray computerized tomography (CT) to determine the presence of internal decay. This report is part of an overall study in which Douglas-fir (Pseudotsuga menziesii) glue-laminated (glulam) beams and solid sawn timbers were inoculated with brown rot fungus, Fomitopsis pinicola, and exposed to aboveground conditions approximately 25 miles (40 km) north of Gulfport, Mississippi, USA. The goal of the overall study is to develop interior decay within the test specimens and then identify and characterize the decay using a variety of nondestructive testing (NDT) techniques. One NDT technique used is x-ray CT. The pixel brightness (PB) of CT scan images is proportional to the specific gravity (SG) at that location; high SG materials appear brighter whereas low SG materials appear darker. The consumption of wood by fungus decreases the wood SG; however, fungal progression takes place in areas where sufficient moisture is present. The presence of moisture increases wood SG as detected by the CT scan, which masks the effect of the fungal decay, which is a common co-occurrence with many NDT techniques. To identify incipient decay, it is necessary to examine the ring structure both within and outside of the area of moisture. Quantifying the extent of the decay requires correlating the PB to known SG values for both dry wood and wood of varying moisture content. In this report, the relationship between wood SG, moisture content, and PB was quantified.
Online Access
Free
Resource Link
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Nondestructive Evaluation of a 75-Year Old Glulam Arch

https://research.thinkwood.com/en/permalink/catalogue246
Year of Publication
2013
Topic
Serviceability
Material
Glulam (Glue-Laminated Timber)
Application
General Application
Author
Teder, Marko
Wang, Xiping
Year of Publication
2013
Country of Publication
United States
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
General Application
Topic
Serviceability
Keywords
Decay
Delamination
Modulus of Elasticity
Non-Destructive Evaluation
Stress Wave Timing
Wave Propagation
Strength
Resistance Micro-Drilling
Language
English
Conference
International Nondestructive Testing and Evaluation of Wood Symposium
Research Status
Complete
Notes
September 24-27, 2013, Madison, Wisconsin, USA
Online Access
Free
Resource Link
Less detail

Tensile Strength of Thermally Modified Laminated Strand Lumber and Laminated Veneer Lumber

https://research.thinkwood.com/en/permalink/catalogue775
Year of Publication
2016
Topic
Mechanical Properties
Moisture
Material
LSL (Laminated Strand Lumber)
LVL (Laminated Veneer Lumber)
Application
General Application
Author
Aro, Matthew
Wang, Xiping
McDonald, Dwight
Begel, Marshall
Publisher
Taylor&Francis Online
Year of Publication
2016
Country of Publication
United Kingdom
Format
Journal Article
Material
LSL (Laminated Strand Lumber)
LVL (Laminated Veneer Lumber)
Application
General Application
Topic
Mechanical Properties
Moisture
Keywords
Modulus of Elasticity
Temperature
Thermally Modified Timber
Language
English
Research Status
Complete
Series
Wood Material Science & Engineering
Online Access
Free
Resource Link
Less detail