Planar shear and bending properties of hybrid CLT fabricated with lumber and LVL
https://www.sciencedirect.com/science/article/abs/... [Mechanical Performance] [Journal Article] 2017
Zhiqiang Wang, Hongmei Fu, Meng Gong, Jiayan Luo, Weiqun Dong, Ting Wang, Ying Hei Chui
Planar (rolling) shear properties in cross laminated timber (CLT) is an important factor that should be considered for CLT structural components with short span or openings. The planar shear properties of SPF (Spruce-pine-fir) dimension lumber and laminated veneer lumber (LVL) were measured using a modified approach in this study. The failure modes in planar shear tests were investigated by visual inspection and optical microscope. Hybrid CLT (HCLT) was fabricated using lumber and/or LVL, and it...

Rotational mechanical behaviour of wood-wood connections with application to double-layered folded timber-plate structure
https://www.sciencedirect.com/science/article/abs/... [Connectors] [Journal Article] 2018
Julien Gamerro, Christopher Robeller, Yves Weinand
This paper is focused on the structural design of an innovative wood-wood connection designed for a full-scale double-layered timber folded-plate structure: the new Vidy theatre pavilion (Lausanne, Switzerland). Investigations into the potential of these new connections have been ongoing since 2010 in the Laboratory for Timber Constructions (IBOIS) at Ecole Polytechnique Fédérale de Lausanne (EPFL). As a continuation of this research line, the mechanical characterization of the Vidy pavilion con...

Angle bracket connections for CLT structures: Experimental characterization and numerical modelling
https://www.sciencedirect.com/science/article/abs/... [Connectors] [Journal Article] 2018
Luca Pozza, Anna Saetta, Marco Savoia, Diego Talledo
This paper presents an enhanced coupled axial-shear model for the monotonic and cyclic behavior of Cross Laminated Timber (CLT) panel – angle bracket connections. The proposed model accounts for the degradation phenomena due to cyclic loading that may affect strength, unloading and re-loading stiffnesses. The main parameters necessary to define the constitutive laws of the model are evaluated by linear regression analyses performed on the data obtained by an extensive experimental campaign speci...

Connections for steel–timber hybrid prefabricated buildings. Part I: Experimental tests
https://www.sciencedirect.com/science/article/abs/... [Connectors] [Journal Article] 2016
Cristiano Loss, Maurizio Piazza, Ricardo Zandonini
Steel–timber hybrid construction systems, in particular structures with steel frames, composite steel–timber floors and shear walls with Cross-Laminated Timber (CLT) sheets, combine the industrialized construction technology typical of steel systems with the advantages offered by CLT panels, namely lightness and in-plane stability. The paper proposes some original engineered solutions for joining CLT panels with steel elements. Specifically, it examines connections which allow both prefabricatio...

Testing of timber-to-timber screw-connections in hybrid configurations
https://www.sciencedirect.com/science/article/abs/... [Alternative/Hybrid Configurations] [Journal Article] 2018
Gianni Schiro, Ivan Giongo, Wendel Sebastian, Daniele Riccadonna, Maurizio Piazza
This paper presents the results of an extensive experimental study on the short-term mechanical performance of timber screw connections comprising different types of fasteners (inserted at 45° and 90° to the grain) and different timber products (solid sawn timber, glued laminated timber, cross laminated timber and laminated veneer lumber) made from both softwood and hardwood species. Fifty-eight specimens laid out in fourteen arrangements were tested under quasi-static monotonic loading. The tes...

Fire protection of light and massive timber elements using gypsum plasterboards and wood based panels: A large-scale compartment fire test
https://www.sciencedirect.com/science/article/abs/... [Fire Performance] [Journal Article] 2014
Dionysois I. Kolaitis, Eleni K. Asimakopoulou, Maria A. Founti
A full-scale compartment fire test was performed to assess gypsum plasterboards and wood based panels as cladding materials for the fire protection of light and massive timber elements. The test compartment was constructed using both the timber frame and the cross laminated timber techniques; a wood crib was used to achieve realistic fire conditions. Temperature measurements and optical inspection evidence suggested that gypsum plasterboards offered adequate fire protection since they did not fa...

High-capacity hold-down for mass-timber buildings
https://www.sciencedirect.com/science/article/abs/... [Tall Buildings] [Journal Article] 2018
Xiaoyue Zhang, Marjan Popovski, Thomas Tannert
Engineered mass-timber products such as cross-laminated timber enable the use of timber as structural material in tall buildings. One of the advantages of using timber is the reduction in weight and the resulting reduction in foundation costs. A lower structural mass, however, will also lead to less inherent resistance to overturning forces caused by lateral loads such as wind. This paper summarizes the experimental studies on a novel high-capacity hold-down solution for tall timber structures. ...

Evaluation of bending tests on composite glulam-GLE beams connected with double-sided punched metal plates and inclined screws
https://www.sciencedirect.com/science/article/abs/... [Connectors] [Journal Article] 2015
Nicolas Jacquier, Ulf Arne Girhammar
Composite beam elements made of glulam beams and cross laminated timber (CLT) panels, and connected with a new shear connection system were tested under four point bending. The beams tested represent a section of a cassette floor element to be used in a multi-storey CLT construction system. The shear connection is primarily made of double-sided punched metal plate fasteners, connecting the CLT and glulam members to form a T-cross-section. Due to the uncertainty about the capacity of the double-s...

A numerical study of coupled timber walls with slip friction damping devices
https://www.sciencedirect.com/science/article/abs/... [Seismic Performance] [Journal Article] 2016
Ashkan Hashemi, Reza Masoudnia, Pierre Quenneville
In rocking timber structures, the traditional connections such as nailplates may need to be replaced by damping devices to provide the required lateral resistance and dissipate the seismic energy. This study seeks to investigate the seismic behaviour of coupled timber walls with slip friction connections. Slip friction connections present a low damage solution as they do not suffer from stiffness degradation and can be used after a seismic event. The seismic response of the described system is c...

Coupled axial-shear numerical model for CLT connections
https://www.sciencedirect.com/science/article/abs/... [Connectors] [Journal Article] 2017
Luca Pozza, Anna Saetta, Marco Savoia, Diego Talledo
A new coupled axial-shear numerical model is proposed to simulate the response of typical Cross Laminated Timber (CLT) connections under general loading conditions. The general model is then specialized for hold-down connections. To this aim, a series of experimental tests was first designed and performed at University of Bologna, in order to provide for the necessary data for the characterization of the numerical model. The main parameters required to define the constitutive law of the model ar...

Tests on glulam-CLT shear connections with double sided punched metal plate fasteners and inclined screws
https://www.sciencedirect.com/science/article/abs/... [Connectors] [Journal Article] 2014
Nicolas Jacquier, Ulf Arne Girhammar
A new shear connection system was tested in order to be used in off-site manufactured cassette floor elements made with glulam beams and cross laminated timber (CLT) panels. This type of floor element can present advantages from weight, structural and assembly point of view in multi-storey timber construction. The shear connection proposed is made of double-sided punched metal plate fasteners, connecting CLT and glulam members to form a T-cross-section. Inclined screws are used in combination wi...

Bolt shear connectors in grout pockets: Finite element modelling and parametric study
https://www.sciencedirect.com/science/article/abs/... [Connectors] [Journal Article] 2018
A. Hassanieh, H.R. Valipour, M.A. Bradford
Recent laboratory experiments have demonstrated the superior performance (high stiffness, load-carrying capacity and ductility) of bolt shear connectors embedded in the pockets of cementitious grout compared to conventional fasteners (e.g. screws) for developing composite action between steel beams and timber slabs. Accordingly, this paper investigates the structural behaviour of steel-timber composite (STC) joints with bolt connectors embedded in grout pockets (BCGP) using 3-D continuum-based f...

Modeling and prediction modulus of elasticity of laminated veneer lumber based on laminated plate theory
https://www.sciencedirect.com/science/article/abs/... [Alternative/Hybrid Configurations] [Journal Article] 2019
Peixing Wei, Brad Jianhe Wang, Xiaojun Wan, Xiaohan Chen
To better guide the manufacturing and application of laminated veneer lumber (LVL), a theoretical model to describe the formation of the modulus of elasticity for LVL based on the laminated plate theory is described in this work. An experiment was designed to validate the model. The results showed that the theoretical prediction agreed with the measured value. The contribution of glue to the resinated veneer mainly depended on the glue solid spread (GS) and veneer thickness, namely, for a GS of ...

Architect perceptions of engineered wood products: An exploratory study of selected countries in Central and Southeast Europe
https://www.sciencedirect.com/science/article/abs/... [Markets] [Journal Article] 2018
Manja Kitek Kuzman, Sanela Klaric, Andreja Pirc Barcic, Richard P. Vlosky, Marija M. Janakieska, Petra Groselj
The wood industries in Slovenia, Croatia, Bosnia and Hercegovina (BiH) and Macedonia have a long tradition of producing a wide range of products. BiH and Macedonia have similar forest sectors and both countries have experienced similar problems in the manufacturing, sale and use of wood-based products in recent years due to the global financial crisis and resulting national economic challenges. Despite having a long and prosperous history, over the past two decades, the wood products sectors in ...

Exploring the climate impact effects of increased use of bio-based materials in buildings
https://www.sciencedirect.com/science/article/abs/... [Environmental Performance] [Journal Article] 2016
Diego Penaloza, Martin Erlandsson, Andreas Falk
Whenever Life Cycle Assessment (LCA) is used to assess the climate impact of buildings, those with high content of biobased materials result with the lowest impact. Traditional approaches to LCA fail to capture aspects such as biogenic carbon exchanges, their timing and the effects from carbon storage. This paper explores a prospective increase of biobased materials in Swedish buildings, using traditional and dynamic LCA to assess the climate impact effects of this increase. Three alternative de...

State-of-the-art in timber materials and structures
https://www.sciencedirect.com/science/article/abs/... [General Information] [Journal Article] 2016
Wendel Sebastian, Maurizio Piazza, Roberto Tomasi
2/20/2019 ScienceDirecthttps://www.sciencedirect.com/science/article/abs/pii/S0950061815008533 1/1There was a problem providing thecontent you requestedPlease contact us via our support center for moreinformation and provide the reference number below. Reference Number: 18.969bfea5.1550708436. e80d27About ScienceDirect Remote access Shopping cartContact and support Terms and conditions Privacy policyCookies are used by this site. For more information, visit the cookies page. Copyright © 2016 E...

CLT-concrete composite floors with notched shear connectors
https://www.sciencedirect.com/science/article/abs/... [Alternative/Hybrid Configurations] [Journal Article] 2019
Yuchen Jiang, Roberto Crocetti
The aim of the paper is to gain data on the mechanical behaviour of CLT-concrete composite floors and subsequently to check if commonly adopted analysis methods are suitable for this particular type of structure. The studies are conducted through laboratory tests, analytical models and numerical modelling. In the shear tests, the notched connections presented considerable stiffness and shear capacity, and failed eventually with shear fracture in the concrete. The bending test results showed that...

Drivers and Barriers of Cross-lamianted Timber (CLT) Production and Commercialization: a Case of Study of Western Europes CLT Industry
http://biobus.swst.org/index.php/bpbj/article/view... [Markets] [Journal Article] 2018
Henry Quesada-Pineda, Robert Smith, Gunter Berger
According to several sources, CLT construction systems are an excellent structural choice for tall commercial and residential buildings, have excellent environmental performance, and provide an additional market for softwood and hardwood lumber. Besides and because of its engineered nature, CLT panels can be an excellent market for low value timber (lesser known species, diseased trees, infested trees, and low-grade timber). However, the US construction industry is not yet taking full advantage ...

Familiarity, Use, and Perceptions of Wood Building Products: A Survey Among Architects on the United States West Coast
http://biobus.swst.org/index.php/bpbj/article/view... [Markets] [Journal Article] 2018
Kendall Jane Conroy, Mariapaola Riggio, Chris Knowles
A wide variety of wood products exist for both structural and non-structural uses; however, the material is still underutilized in non-residential construction in the United States. Since architects are one of the key decision makers for material selection in the construction sector, we investigated architects’ familiarity, use, and perceptions of wood products. We contacted American Institute of Architects certified architects on the US West Coast, a prominent area for the forest product indust...

Parallel Compression to Grain and Stiffness of Cross Laminated Timber Panels with Bamboo Reinforcement
https://bioresources.cnr.ncsu.edu/resources/parall... [Alternative/Hybrid Configurations] [Journal Article] 2018
Rafaele A. Munis, Diego A. Camargo, Aliane C. de Almeida, Victor A. de Araujo, Mauri P. de Lima Junior, Elen A. M. Morales, Danilo Simoes, Joao C. Biazzon, Carlos A. O. de Matos, Juliana Cortez-Barbosa
Four cross-laminated timber (CLT) panels with and without bamboo reinforcement were prepared and evaluated. The goal was to obtain better possibilities of using this lignocellulosic panel, based on their mechanical properties. Stiffness and strength of compression parallel to grain tests were conducted to simulate the utilization of this material as freestanding walls. Panels were produced based on Pinus elliottii wood species and glued with castor oil-based polyurethane resin. Half of these str...