Determining Suitable Spacings and Distances for Self-tapping Screws by Experimental and Numerical Studies
https://www.researchgate.net/publication/44793911_... [Connectors] [Conference Paper] 2010
Thomas Uibel, Hans Joachim Blass
For the determination of suitable spacings, end and edge distances as well as of the corresponding timber thickness for self-tapping screws extensive conventional insertion tests have to be carried out. In order to reduce the effort of these tests a calculation method was developed which allows an estimation of the splitting behaviour of timber during the insertion process. Therefore the forces exerting on the timber during the insertion were determined using a new test method....

New Design Approach for Wood Brittle Failure Mechanisms in Timber Connections
http://rgdoi.net/10.13140/2.1.3451.3281... [Connectors] [Conference Paper] 2014
Pouyan Zarnani, Pierre Quenneville
Timber construction has experienced considerable progress in recent years. In such progress, apart from the implementation of new engineered timber products, the advancement of timber joints has played a significant role. The design procedures for timber connections in most design codes are based mainly on the yielding capacity of the fasteners using the European Yield Model (EYM). While the EYM theory provides accurate predictions for connections that fail in a ductile fashion, it does not take...

Determining Suitable Spacings and Distances for Self-tapping Screws by Experimental and Numerical Studies
https://www.semanticscholar.org/paper/Determining-... [Connectors] [Conference Paper] 2010
Thomas Uibel, Hans Joachim Blass
For the determination of suitable spacings, end and edge distances as well as of the corresponding timber thickness for self-tapping screws extensive conventional insertion tests have to be carried out. In order to reduce the effort of these tests a calculation method was developed which allows an estimation of the splitting behaviour of timber during the insertion process. Therefore the forces exerting on the timber during the insertion were determined using a new test method. ...

Wooden building products in comparative LCA
https://www.researchgate.net/publication/225509271... [Environmental Performance] [Journal Article] 2007
Frank Werner, Klaus Richter
Background, Aim and Scope We revised the results of approx. 20 years of international research on the environmental impact of the life cycle of wood products used in the building sector compared to functionally equivalent products from other materials. Main Features Original studies either technical reports or scientific papers in English or German were considered. This literature was obtained via an extensive literature review (February 2006), via a consultation of compilations of life cycle as...

In-plane elastic flexibility of cross laminated timber floor diaphragms
https://www.sciencedirect.com/science/article/abs/... [Vibration/Acoustic Performance] [Journal Article] 2019
Giuseppe D’Arenzo, Daniele Casagrande, Thomas Reynolds, Marinella Fossett
No appropriate method exists to calculate the in-plane flexibility of Cross Laminated Timber as a floor diaphragm. This flexibility affects the load distribution between shear walls, bracing or cores, as well as adding to local deflections and inter-storey drift. This paper presents a sensitivity analysis based on experimentally measured connection behaviour from the literature and the present study. An important new contributing factor is described: the connection of the floor panels to the sup...

Bonding quality of cross-laminated timber: Evaluation of test methods on Eucalyptus grandis panels
https://www.sciencedirect.com/science/article/abs/... [Raw Materials] [Journal Article] 2019
Michael Dugmore, Michela Nocetti, Michele Brunetti, Zahra Naghizadeh, C. Brand Wessels
The objectives of this study were (1) to analyse different testing methods for evaluating face-bonding quality of cross-laminated timber from Eucalyptus grandis timber bonded with a one component polyurethane adhesive and (2) to evaluate the effect of different processing variables on the face-bonding quality of cross-laminated panels. A 3 × 2 factorial design was used to test the effect of clamping pressure, wood density, and presence of stress relief grooves on the bonding quality. Two existin...

Out-of-grade sawn pine: A state-of-the-art review on challenges and new opportunities in cross laminated timber (CLT)
https://www.sciencedirect.com/science/article/abs/... [Raw Materials] [Journal Article] 2019

Plantation softwood is the future timber material resource for building and construction. However, significant volumes of sawn softwood are considered out-of-grade and sold at a loss. New approaches and methods need to be implemented to value-add out-of-grade timber and increase structural yield from existing plantations. This paper provides a critical review of out-of-grade characteristics of pine timber to gain an understanding of the strengths and weaknesses of this resource as a structural b...

Hexion’s Waste Saving Adhesive System Completes ANSI Structural Certifications for Both Glue Laminated Beams and Cross-laminated Timber
https://www.apnews.com/3e04a46392c34623a08b993ed11... [Bonding/Adhesives] [Magazine/Newspaper Article] 2019
Hexion
Hexion Inc.’s (“Hexion” or the “Company”) versatile EcoBind TM adhesives for structural engineered wood products recently completed all independent laboratory testing required by the American National Standards Institute (ANSI) and is certified for high volume manufacture of glue laminated beams (glulam) and cross-laminated timber (CLT). “Our newly certified adhesive system improves the utilization of adhesive and can reduce waste by 80 to 90 percent, which can result in cost savings and a less...

Hygrothermal properties analysis of cross-laminated timber wall with internal and external insulation systems
https://www.sciencedirect.com/science/article/pii/... [Moisture/Durability] [Journal Article] 2019
Hyun MiCho, Seunghwan Wi, Seong Jin Chang, Sumin Kim
Environmental energy is being studied actively around the world due to the effects of climate change, global warming, and energy policies. Energy policies are being reinforced to reduce building energy consumption. Therefore, environmental-friendly and sustainable building materials have been used to reduce energy consumption. The cross-laminated timber (CLT) wall is an environmental-friendly material that stacks layers at right angles, and bonds them together to form large solid panels. However...

Bond integrity of cross laminated timber from Acacia mangium wood as affected by adhesive types, pressing pressures and loading direction
https://www.sciencedirect.com/science/article/pii/... [Raw Materials] [Journal Article] 2019
Norwahyuni Mohd Yusof, Paridah Md Tahir, Adlin Sabrina Muhammad Roseley, Lee Seng Hua, Juliana Abdul Halip, Redzuan Mohammad Suffian James, Zaidon Ashaari
Cross laminated timber (CLT) was fabricated from Acacia mangium wood by using phenol resorcinol formaldehyde (PRF) and one component polyurethane (PUR) as binders. The purpose of the study was to evaluate the bond integrity of A. mangium CLT produced using different working parameters. The assemblies were pressed at 30 °C for 30 min using three pressing pressures (0.9 N/mm2, 1.2 N/mm2, and 1.5 N/mm2). Delamination and block shear tests were conducted on the CLT according to European Standards, E...

Prediction of Internal Shear Capacity of Sugi CLT Panels
https://www.researchgate.net/publication/269529158... [Raw Materials] [Journal Article] 2014
Minoru Okabe, Motoi Yasumura, Kenji Kobayashi
Cross-laminated timber (CLT) panels consist of several layers of lumber stacked crosswise and glued together on their faces. CLT panels are excellently applicable for timber buildings as slabs for horizontal structural members. Live load and dead load on CLT panels cause internal shear stress. Distribution of internal shear stress in CLT panels is affected by the modulus of elasticity of parallel layers. Rolling shear stress occurs in cross layers under shear force applied to CLT panels. General...

Multi-scale model updating for the mechanical properties of cross-laminated timber
https://www.researchgate.net/publication/308759313... [Mechanical Performance] [Journal Article] 2016
Erick Saavedra Flores, Rafic Ajaj, Iman Dayyani, Yatish Chandra, Raj Das
In this paper we propose a homogenisation-based four-scale model for the mechanical properties of cross-laminated timber. The spatial scales considered in this study are the wood cell-wall, the wood fibres, growth rings and the structural scale. The computational homogenisation scheme is solved sequently from the lowest to the highest level in order to determine the effective mechanical properties of each material scale. As we are interested in improving the predictions of our computational simu...

Blast Performance of Cross-Laminated Timber Panels with Realistic Boundary Conditions
https://www.researchgate.net/publication/325795154... [Other] [Conference Paper] 2018
Dominic Côté, Christian Viau, Daniel Lacroix, Ghasan Doudak
This paper presents a recent study which investigated the effects of realistic boundary conditions on the behaviour of cross-laminated timber (CLT) panels when subjected to out-of-plane blast loads. Experimental testing was conducted at the University of Ottawa Blast Research Laboratory, where shock waves were generated and applied through the use of a shock tube test apparatus. Connection configurations with seismic detailing were considered, in order to evaluate whether existing structures hav...

Shear Capacity of Cross-Laminated Wooden Walls
https://www.researchgate.net/publication/267692899... [Mechanical Performance] [Journal Article] 2016
Bruno Dujic, Simona Klobcar, Roko Zarnić
Accept Cookies top See all › 7 Citations See all › 7 References Download citation Share Facebook Twitter LinkedIn Reddit Download full-text PDF Shear Capacity of Cross-Laminated Wooden Walls Article (PDF Available) with 1,127 Reads Cite this publication Bruno Dujic 9.14 CBD d.o.o. - Contemporary Building Design Teaching Assistant Roko Zarnić 8.61 University of Ljubljana Abstract The new structural systems consisted of solid cross-laminated wooden slabs are becoming more popular as effective tec...

Durability of cross laminated timber against termite damage
https://www.fpl.fs.fed.us/documnts/pdf2018/fpl_201... [Moisture/Durability] [Conference Paper] 2018
Tamara S.F.A. França, C. Elizabeth Stokes, Juliet D Tang
Mass timber is a category of framing components that can be built with a variety of materials. Engineered wood products have become the backbone of the mass timber movement. Some of the most common mass timber structural elements used in buildings are glue-laminated beams (glulam), laminated veneer lumber (LVL) and cross laminated timber (CLT). However, wood is a natural material which is susceptible to decay and termite attack. Subterranean termites cause billions of dollars in damage each year...

IDA comparison of IBC-designed and DDD-designed six-story light-frame wood buildings
https://www.researchgate.net/publication/245290496... [Seismic Performance] [Journal Article] 2010
John W. van de Lindt, Shiling Pei, Weichiang Pang, David V. Rosowsky
The current International Building Code (IBC) allows wood-frame (i.e., light-frame wood) construction to be three stories high or four stories high if sprinklers are included in the design. Several jurisdictions within the United States have opted to allow four and five stories if sprinklers are present. This paper presents a comprehensive numerical analysis of a six-story wood-frame building designed on the basis of the 2006 IBC methodology and a building designed by using the direct-displaceme...

Performance-Based Seismic Design of Wood Framed Buildings
https://www.researchgate.net/publication/239390850... [Seismic Performance] [Journal Article] 2002
Andre Filiatrault, Bryan Folz
An important advancement in structural engineering in recent years has been the development of performance-based seismic design. However, its application to engineered wood framed buildings remains largely unexplored. This paper discusses the application of performance-based seismic design to wood framed buildings through a direct-displacement methodology, In the first part of the paper, limitations of the current force-based seismic design procedure for wood framed buildings are outlined. There...

Comparison of bending stiffness of cross-laminated solid timber derived by modal analysis of full panels and by bending tests of strip-shaped specimens
https://www.researchgate.net/publication/229077952... [Mechanical Performance] [Journal Article] 2012
René Steiger, Arne Gülzow, Christoph Czaderski, Martin T. Howald, Peter Niemz
The design of cross-laminated solid timber (CLT) as load-bearing plates is mainly governed by serviceability criterions like maximal deflection and susceptibility to vibration. Hence, predicting the respective behavior of such plates requires accurate information about their elastic properties. According to product standards, the bending stiffness of CLT has to be assessed from 4-point bending tests of strip-shaped specimens, cut from the CLT panels. By comparing elastic properties of CLT derive...

Mass Timber University Grant Program Initiated by U.S. Endowment and USDA Forest Service
https://www.fpl.fs.fed.us/labnotes/?cat=4... [Markets] [Report] 2019
Rebecca Wallace
The U.S. Endowment for Forestry and Communities (Endowment), in partnership with the United States Department of Agriculture’s Forest Service (USFS), today announced the initiation of the Mass Timber University Grant Program (Grant Program) and related Request for Proposals (RFP) to promote the construction of mass timber buildings on institutions of higher learning campuses across the U.S. The intent of the Grant Program is to inspire interest in and support for mass timber products among the a...

Stora Enso - Technical Brochure CLT
http://www.clt.info/en/media-downloads/brochures/... [Commercial/Company Information] [Brochure/Product Sheet] 2019
Stora Enso
The most important technical information - such as building physics, statics or technical details about CLT – are explained short and clear in this brochure...