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96 records – page 1 of 10.

Accommodating Shrinkage in Multi-Story Wood-Frame Structures

https://research.thinkwood.com/en/permalink/catalogue712
Year of Publication
2017
Topic
Design and Systems
Moisture
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Author
McLain, Richard
Steimle, Doug
Organization
WoodWorks
Year of Publication
2017
Country of Publication
United States
Format
Report
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Topic
Design and Systems
Moisture
Keywords
Shrinkage
Mid-Rise
Multi-Story
Moisture Content
Language
English
Research Status
Complete
Summary
In wood-frame buildings of three or more stories, cumulative shrinkage can be significant and have an impact on the function and performance of finishes, openings, mechanical/electrical/plumbing (MEP) systems, and structural connections. However, as more designers look to wood-frame construction to improve the cost and sustainability of their mid-rise projects, many have learned that accommodating wood shrinkage is actually very straightforward. This publication will describe procedures for estimating wood shrinkage and provide detailing options that minimize its effects on building performance.
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Free
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Adhesive-Bonded Timber-Concrete Composites - Experimental Investigation of Thermal-Hygric Effects

https://research.thinkwood.com/en/permalink/catalogue1519
Year of Publication
2016
Topic
Serviceability
Mechanical Properties
Material
Timber-Concrete Composite
Author
Seim, Werner
Eisenhut, Lars
Kühlborn, Sonja
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Timber-Concrete Composite
Topic
Serviceability
Mechanical Properties
Keywords
Climate
Long-term
Shear Strength
Deformation
Temperature
Moisture Content
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 597-605
Summary
The advantages of the two different building construction materials, timber and concrete, can be used effectively in adhesive-bonded timber-concrete composite constructions. The long-term behavior was investigated experimentally on small-scale shear and bond specimens under artificial, alternating climatic conditions and on fullscale specimens under natural climatic conditions for an application in construction practice. The development of the shear strength and the deformation behavior under permanent loads were studied, focusing on the different material behavior of wood and concrete regarding changes in temperature and moisture. The general applicability of adhesivebonded timber-concrete composites in construction practice was proved in the investigations.
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Free
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Agricultural Buildings With Timber Structure - Preventative Chemical Wood Preservation Inevitably Required?

https://research.thinkwood.com/en/permalink/catalogue1914
Year of Publication
2018
Topic
Moisture
Application
Wood Building Systems
Author
Jiang, Yuan
Dietsch, Philipp
Winter, Stefan
Year of Publication
2018
Country of Publication
Korea
Format
Conference Paper
Application
Wood Building Systems
Topic
Moisture
Keywords
Moisture Content
Spruce
Agriculture
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 20-23,2018. Seoul, Republic of Korea
Online Access
Free
Resource Link
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Analysis of Hygroscopic Self-Shaping Wood at Large Scale for Curved Mass Timber Structures

https://research.thinkwood.com/en/permalink/catalogue2162
Year of Publication
2019
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Author
Grönquist, Philippe
Wood, Dylan
Hassani, Mohammad
Wittel, Falk
Menges, Achim
Rüggeberg, Markus
Publisher
American Association for the Advancement of Science
Year of Publication
2019
Country of Publication
United States
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Design and Systems
Keywords
Moisture Content
Architecture
Self-Shaping
Language
English
Research Status
Complete
Series
Science Advances
Online Access
Free
Resource Link
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Benchmarking of the Advanced Hygrothermal Model HygIRC – Large Scale Drying Experiment of the Mid-Rise Wood Frame Assembly

https://research.thinkwood.com/en/permalink/catalogue349
Year of Publication
2014
Topic
Design and Systems
Moisture
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Author
Maref, Wahid
Saber, Hamed
Ganapathy, Gnanamurugan
Abdulghani, Khaled
Nicholls, Mike
Organization
National Research Council of Canada
Year of Publication
2014
Country of Publication
Canada
Format
Report
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Topic
Design and Systems
Moisture
Keywords
Drying Rate
Full Scale
Hygrothermal
Mid-Rise
Moisture Content
Construction Phase
Language
English
Research Status
Complete
Summary
Recent research in the field of assessment of hygrothermal response has focused on either laboratory experimentation or modelling, but less work has been reported in which both aspects are combined. Such type of studies can potentially offer useful information regarding the benchmarking of models and related methods to assess hygrothermal performance of wall assemblies. This report documents the experimental results of a benchmark experiment that was designed to allow benchmarking of stud drying predicted by NRC’s an advanced hygrothermal computer model called hygIRC, when subjected to nominally steady-state environmental conditions. hygIRC uses hygrothermal properties of materials derived from tests on small-scale specimens undertaken in the laboratory. The drying rates of wall assembly featuring wet studs that result from moisture accumulated during the framing stage of a 5 or 6 storey building. The drying rate of those studs was assessed in an experiment undertaken in a controlled laboratory setting. The results were subsequently used to help benchmark hygIRC reported under separate cover.
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Free
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Building Climate – Long-Term Measurements to Determine the Effect on the Moisture Gradient in Timber Structures

https://research.thinkwood.com/en/permalink/catalogue266
Year of Publication
2014
Topic
Serviceability
Moisture
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Author
Gamper, Andreas
Dietsch, Philipp
Merk, Michael
Organization
Technical University of Munich
Year of Publication
2014
Country of Publication
Germany
Format
Report
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Topic
Serviceability
Moisture
Keywords
Moisture Gradients
Climate
Load Carrying
Language
English
Research Status
Complete
Summary
Through long-term measurements of climate data (temperature, relative humidity) and timber moisture content on large-span timber structures in buildings of typical construction type and use, data sets were generated which deliver information on the sequence and magnitude of seasonal variations. The measurement of moisture in different depths of the cross-section is of particular interest to draw conclusions on the size and speed of adjustment of the moisture distribution to changing climatic conditions. The moisture gradient has direct influence on the size of the internal stresses and possible damage potential. Similarly, the results provide a review and extension of the previous classification of buildings into use classes. They allow for a more precise indication of range of resulting equilibrium moisture content for the specific use, enabling the installation of timber elements with adjusted moisture content. The results of the research project also support the development of appropriate monitoring systems, which could be used in the form of early warning systems based on climate measurements
Online Access
Free
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A Case Study on The Construction of a CLT Building Without a Preliminary Roof

https://research.thinkwood.com/en/permalink/catalogue2185
Year of Publication
2019
Topic
Moisture
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Liisma, Eneli
Liseth Kuus, Babette
Kukk, Villu
Kalamees, Targo
Publisher
Kaunas University of Technology
Year of Publication
2019
Country of Publication
Lithuania
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Moisture
Design and Systems
Keywords
Moisture Safety
Building Quality
Building Technology
Moisture Content
Language
English
Research Status
Complete
Series
Journal of Sustainable Architecture and Civil Engineering
Notes
DOI link: https://doi.org/10.5755/j01.sace.25.2.22263
ISSN
2335–2000
Online Access
Free
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Characteristics of the Radio-Frequency/Vacuum Drying of Heavy Timbers for Post and Beam of Korean Style Housings Part II: For Korean Red Pine Heavy Timbers with 250 × 250 mm, 300 × 300 mm in Cross Section and 300 mm in Diameter, and 3,600 mm in Length

https://research.thinkwood.com/en/permalink/catalogue1508
Year of Publication
2011
Topic
Moisture
Material
Solid-sawn Heavy Timber
Application
Wood Building Systems
Author
Lee, Nam-Ho
Zhao, Xue-Feng
Shin, Ik-Hyun
Park, Moon-Jae
Park, Jung-Hwan
Park, Joo-Saeng
Publisher
The Korean Society of Wood Science Technology
Year of Publication
2011
Country of Publication
Korea
Format
Journal Article
Material
Solid-sawn Heavy Timber
Application
Wood Building Systems
Topic
Moisture
Keywords
Radio-Frequency/Vacuum Drying
Moisture Gradient
Shrinkage
Case Hardening
Surface Checks
Compressive Load
Language
Korean
Research Status
Complete
Series
Journal of the Korean Wood Science and Technology
Summary
This study examined the characteristics of radio-frequency/vacuum dried Korean red pine (Pinus densoflora heavy timbers with 250 × 250 mm (S), 300 × 300 mm (L) in cross section and 300 mm in diameter, and 3,600 mm in length, which were subjected to compressive loading after a kerf pretreatment. The following results were obtained : The drying time was short and the drying rate was high in spite of the large cross section of specimens. The moisture gradient inall specimens was gentle in both longitudinal and transverse directions owing to dielectric heating. The shrinkage of the width in the direction perpendicular to was 21 percent ~ 76 percent of that of the thickness of square timbers in the direction parallel to the mechanical pressure. The casehardening for all specimens was very slight because of significantly reduced ratio of the tangential to radial shrinkage of specimens and kerfing. The surface checks somewhat severely occurred although the occurrence extent of the surface checks on the kerfed specimens was slight compared withthat on the control specimen.
Online Access
Free
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Characterization of Adhesively Bonded Wood Structures by Electrical Modification of the Bonding System

https://research.thinkwood.com/en/permalink/catalogue1500
Year of Publication
2016
Topic
Connections
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Author
Winkler, Christoph
Schwarz, Ulrich
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Topic
Connections
Mechanical Properties
Keywords
Adhesives
Electrical Conductive Adhesives
Moisture Content
Bondline
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 262-269
Summary
Structural changes like deformations and crack growth in polymers, filled with electrically conductive particles can be measured by resistography. Accordingly, the polymeric adhesive layers in glued-laminated timber should be usable for characterization of the wooden structures and the integrity of the bondline. The described research of the last years – partly described on different conferences in 2012 to 2016, refined and extended - addresses the question, if electrically conductive adhesives can be used to characterize structural changes of wooden structures. Electrical conductive adhesives have been modified with carbon based fillers to use the bondline as a sensor in layered wood structures. Laboratory scaled samples were prepared and tested in different load and climate conditions to proof the usability of the conductive adhesive for measurement purposes. The results are showing a correlation between displacement and DC resistivity. Further, the signals also allow a separation among the different kinds of stress states. By varying the contact points of the resistivity measurement it was also possible to monitor the wood moisture.
Online Access
Free
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Checking in CLT Panels: An Exploratory Study

https://research.thinkwood.com/en/permalink/catalogue2625
Year of Publication
2011
Topic
Moisture
Material
CLT (Cross-Laminated Timber)
Author
Casilla, Romulo
Lum, Conroy
Pirvu, Ciprian
Wang, Brad
Organization
FPInnovations
Year of Publication
2011
Country of Publication
Canada
Format
Report
Material
CLT (Cross-Laminated Timber)
Topic
Moisture
Keywords
Panels
Testing Methods
Surface Checks
Moisture Content
Gaps
Language
English
Research Status
Complete
Summary
A study was conducted with the primary objective of gathering information for the development of a protocol for evaluating the surface quality of cross-laminated timber (CLT) products. The secondary objectives were to examine the effect of moisture content (MC) reduction on the development of surface checks and gaps, and find ways of minimizing the checking problems in CLT panels. The wood materials used for the CLT samples were rough-sawn Select grade Hem-Fir boards 25 x 152 mm (1 x 6 inches). Polyurethane was the adhesive used. The development of checks and gaps were evaluated after drying at two temperature levels at ambient relative humidity (RH). The checks and gaps, as a result of drying to 6% to 10% MC from an initial MC of 13%, occurred randomly depending upon the characteristics of the wood and the manner in which the outer laminas were laid up in the panel. Suggestions are made for minimizing checking and gap problems in CLT panels. The checks and gaps close when the panels are exposed to higher humidity. Guidelines were proposed for the development of a protocol for classifying CLT panels into appearance grades in terms of the severity of checks and gaps. The grades can be based on the estimated dimensions of the checks and gaps, their frequency, and the number of laminas in which they appear.
Online Access
Free
Resource Link
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96 records – page 1 of 10.