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59 records – page 1 of 6.

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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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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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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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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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.
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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
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Climatological Analysis for Hygrothermal Performance Evaluation: Mid-Rise Wood

https://research.thinkwood.com/en/permalink/catalogue755
Year of Publication
2014
Topic
Moisture
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Author
Cornick, Steve
Swinton, Michael
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
Moisture
Keywords
Climate
Hygrothermal
Mid-Rise
Moisture Content
National Building Code of Canada
Water Penetration
Language
English
Research Status
Complete
Summary
The objective of the task is to select, from the 679 locations in Table C-2 of the 2010 National Building Code of Canada (NBC 2010) [1], several representative locations for which long-term historical weather data exists. This information from these locations can subsequently be used to determine the exterior boundary conditions for input files for hygrothermal simulation programs and hygrothermal testing in the laboratory. This report discusses the selection of locations for the hygrothermal simulation task of the project on Mid-rise Wood Buildings and the determination of spray-rates and pressure differentials for the water penetration testing portion of the project.
Online Access
Free
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Composite Cross Laminated Timber (CCLT) Made with Engineered Wood Products (EWP) and Hardwood

https://research.thinkwood.com/en/permalink/catalogue1578
Year of Publication
2016
Topic
Design and Systems
Cost
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
LSL (Laminated Strand Lumber)
LVL (Laminated Veneer Lumber)
Author
Grandmont, Jean-Frédéric
Wang, Brad
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
LSL (Laminated Strand Lumber)
LVL (Laminated Veneer Lumber)
Topic
Design and Systems
Cost
Mechanical Properties
Keywords
Dimensional Stability
SPF
Birch
Aspen
Maple
Equilibrium Moisture Content
Delamination
Bond Line
Manufacturing
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1723-1730
Summary
North American cross laminated timber is currently made of softwood lumber following the guidelines of the ANSI/APA PRG-320 manufacturing standard. In this study, the potential of manufacturing CLT panels using various hardwood species and engineered wood products (EWP) was investigated for their compatibility and the impact on the dimensional stability and aesthetics of the end products. Yellow birch, trembling aspen, sugar maple, laminated strand lumber (LSL) and laminated veneer lumber (LVL) were compared to 100% spruce-pine-fir group species (SPF) lumber made CLT panel. The bond line performance of the assemblies was tested as well as the dimensional stability and appearance of the panels when subjected to conditions with equilibrium moisture contents (EMC) of 4.5%, 12% and 16%. Results showed that higher density hardwood species were prone to delamination. LSL, LVL and trembling aspen yielded promising delamination results. Best overall dimensional stability results were achieved with EWP inclusive configurations. Aesthetic integrity assessment showed that the use of hardwood for the core layer and edge gluing of softwood outer layers had a negative impact. Overall, the study showed a great potential for manufacturing future composite CLT (CCLT) products using EWP and low density hardwood species. The cost premium of using these alternative materials would need to be offset by valuable sets of properties or by a reduction of the manufacturing cost.
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Free
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59 records – page 1 of 6.