Board of DirectorsScientific Steering CommitteeResearchers

Theme 1: Cross laminated timber (CLT) – material characterization and structural performance

This theme will focus on Cross Laminated Timber (CLT) material characterization and structural performance. It will generate technical information, such as design properties, product evaluation procedures and system-based uses, in support of the development of a national manufacturing industry for CLT and building applications in Canada. This research will also develop CLT product design practices that utilize Canadian forest resources in ways that meet principles of sustainability.

Theme 1 Leaders:

Dr. Frank Lam University of British Columbia
Dr. Mohammad Mohammad FPInnovations

PROJECT T1–1–C1: DEVELOPMENT OF EVALUATION METHODOLOGY FOR ROLLING SHEAR IN CLT

The objective of this project is to develop a testing methodology to determine the rolling shear strength and modulus in CLT. This can be used to assess the effect of major parameters such as edge gluing, width-to-thickness ratio, and moisture content.

Lead Investigator: Dr. Meng Gong, University of New Brunswick
HQP (MSc): Ms. Qinyi Zhou, MSc (2010-2012)
THESIS: DEVELOPMENT OF EVALUATION METHODOLOGY FOR ROLLING SHEAR PROPERTIES IN CROSS LAMINATED TIMBER (CLT)
DOWNLOAD: Absract

FPInnovations Co-Investigator: Dr. Mohammad Mohammad

PROJECT T1–2–C1: DEVELOPMENT OF DESIGN METHODS FOR CLT AND APPLICATION OF MODAL TESTING

The objectives of this project are to develop a vibration test method to measure the flexural stiffness and shear rigidity of a CLT plate and evaluate the application of an analytical orthotropic laminated plate model to predict internal stresses and deformation of CLT, with various manufacturing characteristics.

Lead Investigator: Dr. Meng Gong, University of New Brunswick
Dr. Ying-Hei Chui, University of New Brunswick
HQP (PhD): Mr. Jan Niederwestberg (2010-2013)
FPInnovations Co-Investigator: Dr. Lin Hu
Industrial collaborator: Nordic Engineered Wood

PROJECT T1-3-C1: Localized Rolling Shear Reinforcement of CLT Systems

The goal of research is to develop fundamental understanding of how to improve the rolling shear capacity of Canadian made CLT products by developing a database on rolling shear capacity of reinforced CLT panels and establishing reliability-based design provisions on rolling shear reinforcement of CLT panels.

Lead Investigator: Dr. Frank Lam, University of British Columbia
Dr. Terje Haukaas, University of British Columbia
HQP (MSc): Mr. TzuHsien Shih (2013-2014)
FPInnovations Co-Investigator: Dr. Marjan Popovski

PROJECT T1-4-C1: Development of Non-destructive (NDT) Technique for CLT Grading & Quality Control

The specific objectives of this project are to evaluate the influence of support condition on the measured natural frequencies and propose a clamping system for testing CLT panel, to compare the elastic properties measured using the proposed vibration test technique and those measured using conventional static methods and to develop an algorithm that allows identification of the three correct natural frequencies from measured spectrum signals.

Lead Investigator: Dr. Ying-Hei Chui, University of New Brunswick
HQP (MSc): Mr. Jianhui Zhou (2013-2014)
FPInnovations Co-Investigator: Dr. Lin Hu

PROJECT T1–5–C2: MODELING SEISMIC RESPONSE OF MID-RISE CLT BUILDINGS

The objective of this research is to develop fundamental understanding of the seismic performance of CLT mid-rise building. The project objectives are: 1) Develop and use existing test data for CLT connection system to establish detailed mechanistic based and simplified models for CLT connections and building system 2) Calibrate and verify models against experimental data to be developed in the project and/or accessed from project partners 3) Develop reliability analysis procedures to study the seismic performance of CLT buildings and 4) Calibrate design code provisions to target safety levels for seismic design of CLT buildings.

Lead Investigator: Dr. Frank Lam, University of British Columbia
Dr. Terje Haukaas, University of British Columbia
HQP (PDF): Minghao Li (2012-2013)
HQP (PhD): Jingjing Liu (2012-2014)
FPInnovations Co-Investigator: Dr. Marjan Popovski

PROJECT T1–6–C1: INFLUENCE OF MANUFACTURING PARAMETERS ON CLT PLATE TO RESIST OUT-OF-PLANE LOADING

The objective of this project is to investigate the influence of manufacturing parameters on the out-of-the-plane resistance of CLT panels. Specific objectives of individual projects are: 1) development of an experimental data base and predictive finite element model under short- term loading; and 2) development of an experimental data base and predictive computer model under long- term loading.

Lead Investigator: Dr. Frank Lam, University of British Columbia
Dr. Terje Haukaas, University of British Columbia
HQP (PDF): Dr. Minghao Li (2010-2012)
HQP (MSc): Dr. Yue Chen (2010-2012)
THESIS: STRUCTURAL PERFORMANCE OF BOX BASED CROSS LAMINATED TIMBER SYSTEM USED IN FLOOR APPLICATIONS
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HQP (PhD): Dr. Yuan Li (2012-2014)
THESIS: DURATION‐OF‐LOAD AND SIZE EFFECTS ON THE ROLLING SHEAR STRENGTH OF CROSS LAMINATED TIMBER
DOWNLOAD:Absract

HQP (MSc): Mr. Jason Xin Nie, MSc(2012-2013)
THESIS: Failure mechanism of rolling shear failure of Cross-Laminated Timber
DOWNLOAD:Absract

FPInnovations Co-Investigator: Dr. Ciprian Pirvu
Industrial collaborator: APA – The Engineered Wood Association

PROJECT T1–7–C1: EVALUATING THE IN-PLANE STIFFNESS AND STRENGTH OF CLT FLOOR DIAPHRAGMS

The objective of this project is to develop an appropriate design model for estimating the in-plane stiffness of CLT diaphragms by computer modeling. An additional goal is an experimental study to establish the in-plane strength and stiffness of CLT floors.

Lead Investigator: Dr. Frank Lam, University of British Columbia
Dr. Terje Haukaas, University of British Columbia
HQP (MSc): Ms. Sepideh Ashtari, MSc (2010-2012)
THESIS: In-plane Stiffness of Cross-laminated Timber Floors
DOWNLOAD: Absract

FPInnovations Co-Investigator: Dr. Marjan Popovski

PROJECT T1–8–C3: FORCE TRANSFER AROUND OPENINGS IN WALLS SUBECTED TO IN-PLANE LOADING

The objectives of this study will develop test data for CLT panels with cut-outs and for CLT wall assemblies with openings subjected to in-plane loading, review applicability to CLT of existing analytical models for force transfer around openings and develop detailed numerical models and calibrate them with the test data. A rational design method will be developed to addresses the force transfer around openings in CLT walls by a synthesized mechanics model that is representative of the force transfer around openings with models used to derive design guidelines for the Canadian wood design standard and be made available to design engineers.

Lead Investigator: Dr. Frank Lam, University of British Columbia
Dr. Terje Haukaas, University of British Columbia
HQP (MSc): Sai Ganesh Pai, MSc (2012-2013)
THESIS: FORCE TRANSFER AROUND OPENINGS IN CLT SHEAR WALLS
DOWNLOAD: Absract

FPInnovations Co-Investigator: Dr. Marjan Popovski

PROJECT T1–9–C4: STABILITY OF CLT WALL PANELS SUBJECTED TO IN-PLANE GRAVITY LOADING

The study will develop fundamental understanding of the stability performance of CLT walls in the context of reliability based design with objectives to develop a mechanistic based model to study the stability of CLT walls in relation to manufacturing parameters, develop test data for CLT walls for the purpose of model calibration and verification and develop reliability based design code provisions to address CLT wall stability issues.

Lead Investigator: Dr. Frank Lam, University of British Columbia
Dr. Terje Haukaas, University of British Columbia
HQP (PhD) PK M Moniruzzaman (2012-2014)
FPInnovations Co-Investigator: Dr. Marjan Popovski

PROJECT T1-10-C4: INNOVATIVE POST-TENSIONED CLT WALLS

The goal of research is to develop fundamental understanding of the performance of post tensioned CLT walls in the context of reliability based design with project objectives to develop a database to study the behavior of post tensioned CLT walls, to develop verified computer models to predict the performance of post tensioned CLT walls and to to develop reliability based design code provisions to address post tensioned CLT wall systems.

Lead Investigator: Dr. Frank Lam, University of British Columbia
Dr. Terje Haukaas, University of British Columbia
HQP (PDF) HQP name (2013-2014)
HQP (MSc) Ma Siyao (2012-2014)
FPInnovations Co-Investigator: Dr. Marjan Popovski

PROJECT T1–11–C1: CONNECTIONS IN CLT BUILDING SYSTEMS

The objectives of this project are to verify the applicability of data collected by European researchers on fastening properties to Canadian-made CLT, investigate and develop design values of fastening properties for Canadian CLT product and develop one high performance anchorage/connection method for connection of CLT to non-wood structural frameworks for non-residential applications.

Lead Investigator: Dr. Ian Smith, University of New Brunswick
Dr. Alex Salenikovich, Université Laval
HQP (MSc): Mr. Tom Joyce, MSc, University of New Brunswick (2010-2012)
THESIS: CONNECTIONS FOR CLT DIAPHRAGMS IN STEEL-FRAME BUILDINGS
DOWNLOAD: Abstract

HQP (MSc): Mr. Shawn Kennedy, Université Laval (2012-2013)
THESIS: Fastener withdrawal and embedment strength in glulam and cross‐laminated timber / Résistance à l’enfoncement et à l’arrachement de connecteurs filetés dans le bois lamellé-collé et lamellécroisé (CLT) CONNECTIONS FOR CLT DIAPHRAGMS IN STEEL-FRAME BUILDINGS
DOWNLOAD: abstract

FPInnovations Co-Investigator: Dr. Mohammad Mohammad
Industrial collaborator: Nordic Engineered Wood
Log & Timber Connections
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