Mechanical Properties of Cross-Laminated Timber Accounting for Non-Bonded Edges and Additional Cracks
http://www.cof.orst.edu/cof/wse/faculty/Nairn/pape... [Mechanical Performance] [Conference Paper] 2016
John A. Nairn
Cross-laminated timber (or CLT) must be recognized as a “precracked” wood composite material where the non-bonded edges within each layer act as cracks in the structure. Furthermore, differential shrinkage between the layers of installed CLT panels subjected to variations in moisture and temperature will result in additional cracks forming parallel to the initial precracks. Fortunately, there is a large literature on the effect of such cracks in cross-laminated composites used in aerospace compo...

Fire resistance tests on cross-laminated timber floor panels: An experimental and numerical analysis
https://curve.carleton.ca/system/files/etd/3b3165b... [Fire Performance] [Thesis/Dissertation] 2013
M. Aguanno
Cross-laminated timber (CLT) is an innovative wood technology currently gaining popularity in Canada. However, there is little published information available regarding its performance in fire. The focus of this research is on a series of eight medium-scale, fire-resistance CLT floor tests. Parameters such as charring rate, temperature profile, deflection, gypsum protection and adhesive performance, as well as the overall fire resistance of the floors when subjected to both standard and non-stan...

Researcher studies cross-laminated timber as seismic retrofit tool
https://phys.org/news/2017-07-cross-laminated-timb... [Seismic Performance] [Magazine/Newspaper Article] 2017
Oregon State University
Andre Barbosa of the OSU College of Engineering is collaborating with Cascadia Seismic Strategies on a $150,000 project to study the use of cross-laminated timber panels for seismic retrofits on unreinforced masonry buildings. A grant coordinated through the Downtown Corvallis Association and Oregon Main Street is covering roughly two-thirds of the cost of the project, which will result in mockups of CLT retrofit systems at the 107-year-old Harding Building at Third Street and Madison Street in...

New timber technology a game-changer for Singapore
http://www.eco-business.com/news/new-timber-techno... [Markets] [Magazine/Newspaper Article] 2014
Cline Lim
But this year, the Singapore Civil Defence Force (SCDF) officially revised its fire code to allow the use of Cross Laminated Timber (CLT) for structural components in buildings after a thorough safety assessment. This change came about thanks to the efforts of international property and infrastructure firm Lend Lease, which has been leading efforts to promote the use of CLT technology in Singapore as a cost-saving, environmentally-sustainable building system. Lend Lease noted that the use of CL...

Hygrothermal Properties of Cross Laminated Timber and Moisture Response of Wood at High Relative Humidity
https://curve.carleton.ca/system/files/etd/e7ba278... [Moisture/Durability] [Thesis/Dissertation] 2012
George AlSayegh
Cross Laminated Timber (CLT) is a new wood-based material composed of cross laminated wood boards that form a structural panel. This study focuses on identifying the appropriate methods to determine the hygrothermal properties of CLTs fabricated with Canadian and European Lumber. The laboratory tests carried out in this study will help establish heat, air and moisture response properties to be used for hygrothermal simulation to assess the durability of CLTs in building envelope construction. Me...

Comparison of newly proposed test methods to evaluate the bonding quality of Cross-Laminated Timber (CLT) panels by means of experimental data and finite element (FE) analysis
http://www.sciencedirect.com/science/article/pii/S... [Bonding/Adhesives] [Journal Article] 2016
Michele Betti, Michele Brunetti, Marco Pio Lauriola, Michela Nocetti, Francesco Ravalli, Benedetto Pizzo
The effectiveness of new shear test methods for evaluating the face-bonding quality of Cross-Laminated Timber (CLT) panels was examined by comparing experimental data and numerical modelling. The common characteristic of the specimens was the loading with angle of 45° with respect to the wood grain, in order to avoid rolling shear during test. In addition, the sampling methodology along the panel was investigated, as well as the relation between shear and delamination tests, and the possibility ...

Potential Opportunities for Cross Laminated Timber in South Korean Residential Building Market
https://open.library.ubc.ca/cIRcle/collections/und... [Case Study/Projects] [Report] 2012
Dominic Yun
Cross laminated timber (CLT) is one of the fastest growing engineered wood products in Europe. It is considered to be one of the most reliable wood building materials in the current market. It provides great strength while reducing construction time and carbon emission, which can be marketed competitively with steel and concrete as a primary building material. These advantages allow CLT to be considered the most popular timber product in multi-home complex construction as well as mid-rise commer...

Development of Southern Pine Cross-Laminated Timber for Building Code Acceptance
http://schd.ws/hosted_files/wcte2014/1e/ABS575_Hin... [Standards/Building code] [Conference Paper] 2014
Daniel Hindman, John Bouldin
The current growth of cross laminated timber (CLT) products has spurred interest in the manufacture of CLTs in the United States. The purpose of this paper is to explore the development of CLT materials from southern pine lumber commonly available in Virginia. A 5-layer CLT panel has been constructed using No. 2 southern pine lumber. Evaluation of mechanical properties, fire performance and acoustical performance were conducted. Results of these evaluations can guide the development and acceptan...

Development of CLT Shear Frame Using Metal Plate Insert Connections
http://schd.ws/hosted_files/wcte2014/a0/ABS586_Kit... [Connectors] [Conference Paper] 2014
Akihisa Kitamori, Shoichi Nakashima, Hiroshi Isoda
The purpose of this study is to develop a high strength leg joint for shear wall made of small size cross laminated timber panel in a simple system. The joint of CLT in which steel plate was inserted in the central slit and fixed by high strength bolt at inside of short steel pipes was proposed. In order to grasp the failure mode and strength of CLT member, material tests on embedment and shear were carried out using small CLT blocks. The test results indicated that there is few reinforce effect...

Mass timber: From ‘What the heck is that?’ to ‘Wow!’
https://www.bdcnetwork.com/mass-timber-what-heck-w... [General Information] [Magazine/Newspaper Article] 2017
John Claufield
The idea of using mass timber for tall buildings keeps gaining converts....

WoodWorks Leads Blast Testing Project for Cross-Laminated Timber
http://www.woodworks.org/wp-content/uploads/Blast-... [Fire Performance] [Others] 2016
WoodWorks
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Sherpa-CLT-Connector for Cross Laminated Timber (CLT) Elements
https://www.uibk.ac.at/holzbau/aktuelles/aktuelles... [Connectors] [Conference Paper] 2014
Anton Kraler, Josef Kogl, Roland Maderebner
In cooperation with project partner Vinzenz Harrer GmbH within the framework of the Austrian Research Promotion Agency (FFG), we developed a sophisticated bonding system for cross laminated timber boards. The market needs for a specific bonding system for cross laminated timber boards are well known. Due to the geometry of cross laminated timber elements, the layered structure and cross lamination (0°/90°/..), as well as the (supposed) orthotropy of wood, the use of screws for bonding in grain w...

Mass Timber in North America: Expanding the possibiities of wood building design
http://www.awc.org/pdf/education/des/ReThinkMag-DE... [General Information] [Report] 2015
reThink Wood
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Low cycle fatigue tests and damage accumultation models on the rolling shear strength of cross-laminated timber
https://link.springer.com/content/pdf/10.1007%2Fs1... [Mechanical Performance] [Journal Article] 2016
Yuan Li, Frank Lam
This paper presents a study on rolling shear damage accumulation and duration of load of cross-laminated timber (CLT) with low cycle fatigue tests. The study of the duration-of-load (DOL) effect on strength properties of wood products is typically challenging; it may be more challenging for non-edge-glued CLT considering crosswise layups of wood boards, existing gaps, and non-uniform stress distributions in cross layers. In experimental studies, short-term ramp loading tests and low cycle trapez...

Evaluating Rolling Shear Strength Properties of Cross-Laminated Timber by Short-Span Bending Tests and Modified Planar Shear Tests
https://link.springer.com/content/pdf/10.1007%2Fs1... [Mechanical Performance] [Journal Article] 2017
Minghao Li
This paper presents an experimental study on rolling shear (RS) strength properties of non-edge-glued cross-laminated timber (CLT) made out of New Zealand Radiata pine (Pinus radiata) structural timber. CLT specimens with 35 and 20 mm thick laminations were studied to evaluate the influence of lamination thickness on the RS strength of CLT. Short-span three-point bending tests were used to introduce high RS stresses in cross layers of CLT specimens and facilitate the RS failure mechanism. Modifi...

Production and Technology of Cross Laminated Timber (CLT): A state-of-the-art Report
https://www.researchgate.net/publication/261884030... [General Information] [Conference Paper] 2013
Reinhard Brandner
Cross laminated timber (CLT) has been developed to a worldwide well-known and versatile useable building material. Currently increasing rates in production volume and distribution can be observed. In fact CLT, thanks to its laminar structure making it well suited for use in construction, provides new horizons in timber engineering, in areas which had until now been the realm of mineral building materials like concrete and masonry. After a short introduction, this paper aims to demonstrate curren...

Cross-laminated timber and Glue-laminated timber: The raw materials use in the final product
https://stud.epsilon.slu.se/3261/4/Pettersson_M_Be... [Raw Materials] [Thesis/Dissertation] 2011
Martin Pettersson, Mikaela Berglund
This is a study regarding in what extent quality is considered in the making of the products glue-laminated timber and cross-laminated timber. Glue-laminated timber consists of a set of wood pieces glued together with the fibers in the same direction while cross laminated timber consists of a set of wood pieces glued together with the fibers laying crossed forming a board. Wood is heterogeneous material with different qualities depending on where and how it has grown. By combining heterogenic wo...

Seismic Behavior of Multistory Cross-laminated Timber Buildings
http://www.swst.org/wp/meetings/AM10/ppts/Ceccotti... [Seismic Performance] [Conference Paper] 2010
Ario Ceccotti, Carmen Sandhaas, Motoi Yasumura
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Fire Performance and Design of CLT Construction
https://www.unb.ca/fredericton/forestry/wstc/_reso... [Fire Performance] [Presentation] 2011
Steve Craft
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An Opportunity for Sustainable Growth
https://www.fpl.fs.fed.us/documnts/presentations/m... [Markets] [Presentation] 2015
Steve Lovett
This presentation will cover the Softwood Lumber Boards (SLB) purpose and programs emphasizing mass timber, SLBs interest in the conference, why it was important for SLB to partner with FPL as a sponsor, and what SLB hopes to gain from the conference. Finally, it will summarize how and why the conference and the follow-on activities will be important to all participants....