Skip header and navigation

31 records – page 1 of 2.

Modular Timber Structures

https://research.thinkwood.com/en/permalink/catalogue2748
Year of Publication
2020
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Timber-Concrete Composite
Application
Frames
Author
Kuda, D
Petrícková, M
Publisher
IOP Publishing Ltd
Year of Publication
2020
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Timber-Concrete Composite
Application
Frames
Topic
Design and Systems
Keywords
Modular Structure
High-Rise
Load Bearing
Case Study
Gridshell
Universal System
Language
English
Conference
International Conference on New Advances in Civil Engineering
Research Status
Complete
Series
IOP Conference Series: Materials Science and Engineering
Summary
Related to sustainability movement and minimizing the carbon footprint, timber structures are becoming more attractive. Wood, as main structural material, offers many benefits relate mostly to economic and ecological aspects, compared to other materials as steel or concrete. On the other hand, physical characteristics of wood complicate the usage of a timber for high-rise or large-span structures. It brings a new challenge for architects and engineers to deliver feasible solution for usability of timber, despite its features. One of the possible solutions could be implementation of CLT (Cross-Laminate Timber) panels in structural systems developed earlier for buildings made of prefabricated concrete slabs. SOM in cooperation with Oregon State University are currently testing composite slabs made of CLT and thin concrete layer reinforcing the wood and protecting it from fire. Although the system solution looks promising, and could bring the result, slabs limit using of the space in layout. On the other hand, frame structures would be much more efficient. This article comes up with an idea of modular frame structure, which could help to solve the problem. The scheme is based on "gridshell" type systems, where rods form a more efficient shell for dealing with stress forces.
Online Access
Free
Resource Link
Less detail

Development of Modular System in Midrise to Tall Wood Buildings Phase II

https://research.thinkwood.com/en/permalink/catalogue2530
Year of Publication
2020
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Author
Zhang, Chao
Organization
Timber Engineering and Applied Mechanics (TEAM) Laboratory
Year of Publication
2020
Country of Publication
Canada
Format
Report
Material
CLT (Cross-Laminated Timber)
Topic
Design and Systems
Keywords
Openings
Lateral Performance
Shear Walls
SPF
Spruce-Pine-Fir
Loading Tests
Language
English
Research Status
Complete
Summary
This project studied the effect of openings on the lateral performance of CLT shear walls and the system behavior of the walls in a module. Three-layer Cross Laminated Timber (CLT) was used for manufacturing the wall and module specimens. The laminar was Spruce-Pine-Fir (SPF) #2&Better for both the major and minor layers. Each layer was 35 mm thick. The panel size was 2.44 m × 2.44 m. Four configurations of walls were investigated: no opening, 25% opening, 37.5% opening, and 50% opening. The opening was at the center of the wall and in the shape of a square. A CLT module was made from two walls with 50% openings, with an overall thickness of 660 mm. The specimens were tested under monotonic loading and reverse-cyclic loading, in accordance with ASTM E564-06 (2018) and ASTM E2126-19. The wall without opening had an average peak load of 111.8 kN. It had little internal deformation and the failure occurred at the connections. With a 25% opening, deformation within the wall was observed but the failure remained at the connections. It had the same peak load as the full wall. When the opening was increased to 37.5%, the peak load decreased by 6% to 104.9 kN and the specimens failed in wood at the corners of the opening. Further increasing the opening to 50%, the peak load dropped drastically to 63.4 kN, only 57% of the full wall. The load-displacement relationship was approximately linear until the load reached 60% of the peak or more. Compared to the full wall, the wall with 25% opening had 65% of the stiffness. When the opening increased to 37.5% and 50%, the stiffness reduced to 50% and 24% of the full wall, respectively. The relationship between stiffness and opening ratio was approximately linear. The loading protocol had effect on the peak load but not on the stiffness. There was more degradation for larger openings under reverse-cyclic loading. The performance of the module indicated the presence of system effect that improves the ductility of the wall, which is important for the seismic performance of the proposed midrise to tall wood buildings. The test data was compared to previous models found in literature. Simplified analytical models were also developed to estimate the lateral stiffness and strength of CLT wall with openings.
Online Access
Free
Resource Link
Less detail

Decision-Making for Cross-Laminated Timber Modular Construction Logistics Using Discrete-Event Simulation

https://research.thinkwood.com/en/permalink/catalogue2722
Year of Publication
2020
Topic
Site Construction Management
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Abiri, Bahar
Publisher
Oregon State University
Year of Publication
2020
Country of Publication
United States
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Site Construction Management
Keywords
Modular Construction
Discrete-Event Simulation
Language
English
Research Status
Complete
Summary
The two primary considerations for construction project management are budget and time management. Modular construction has the potential to improve construction productivity by minimizing time and costs while improving safety and quality. Cross-Laminated Timber (CLT) panels are beneficial for modular construction due to the high level of prefabrication, adequate dimensional stability, and good mechanical performance that they provide. Accordingly, CLT modular construction can be a feasible way to speed up the construction and provide affordable housing. However, an in-depth study is needed to streamline the logistics of CLT modular construction supply chain management. CLT modular construction can be performed by two primary means based on type of modules produced: panelized (2D) and volumetric (3D). This research aims to help the Architecture, Engineering, and Construction (AEC) industry by developing a tool to assess the impact of various logistical factors on both panelized and volumetric modular construction productivity. Discrete-Event Simulation (DES) models were developed for panelized and volumetric CLT modular construction based on a hypothetical case study and using data collected from superintendents and project managers. Sensitivity analysis is conducted using the developed models to explore the impact of selected manufacturing and logistical parameters on overall construction efficiency. Comparing volumetric and panelized simulations with the same number of off-site crews revealed that the volumetric model has lower on-site process duration while the off-site process is significantly longer. Accordingly, from manufacturing to the final module assembly, the total time for the volumetric model is longer than panelized model. Moreover, the simulations showed that volumetric modular construction is associated with less personnel cost since the main process is performed off-site, which has lower labor costs and a smaller number of crews required on-site. This framework could be used to identify the optimum construction process for reducing the time and cost of the project and aid in decision-making regarding the scale of modularity to be employed for project.
Online Access
Free
Resource Link
Less detail

Structural Performance of a Hybrid Timber Wall System for Emergency Housing Facilities

https://research.thinkwood.com/en/permalink/catalogue2745
Year of Publication
2021
Topic
Design and Systems
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Walls
Hybrid Building Systems
Author
Casagrande, Daniele
Sinito, Ester
Izzi, Matteo
Pasetto, Gaia
Polastri, Andrea
Publisher
ScienceDirect
Year of Publication
2021
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Walls
Hybrid Building Systems
Topic
Design and Systems
Seismic
Keywords
Prefabrication
Modular
Emergency Housing
Temporary Building
Hybrid Timber Frame
Seismic Behaviour
Language
English
Research Status
Complete
Series
Journal of Building Engineering
Summary
This paper presents an innovative and sustainable timber constructive system that could be used as an alternative to traditional emergency housing facilities. The system proposed in this study is composed of prefabricated modular elements that are characterized by limited weight and simple assembly procedures, which represent strategic advantages when it comes facing a strong environmental disaster (e.g. an earthquake). The complete dismantling of structural elements and foundations is granted thanks to specific details and an innovative connection system called X-Mini, capable of replacing traditional anchoring devices (i.e. hold downs and angle brackets) by resisting both shear and tension loads. This constructive system, denoted as Hybrid Timber Frame (HTF), takes advantage of the strong prefabrication, reduced weight of light-frame timber systems, and of the excellent strength properties of the Cross Laminated Timber (CLT) panels. Specifically, the solid-timber members typically used in the structural elements of light-frame systems are replaced by CLT linear elements. The results of experimental tests and numerical simulations are critically presented and discussed, giving a detailed insight into the performance of the HTF under seismic conditions.
Online Access
Free
Resource Link
Less detail

Climate Effects of Forestry and Substitution of Concrete Buildings and Fossil Energy

https://research.thinkwood.com/en/permalink/catalogue2774
Year of Publication
2021
Topic
Environmental Impact
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Author
Gustavsson, L.
Nguyen, T.
Sathre, Roger
Tettey, U.Y.A.
Publisher
Elsevier
Year of Publication
2021
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Topic
Environmental Impact
Keywords
Climate Change
Modular Construction
Carbon Emissions
Forest Management
Language
English
Research Status
Complete
Series
Renewable and Sustainable Energy Reviews
Summary
Forests can help mitigate climate change in different ways, such as by storing carbon in forest ecosystems, and by producing a renewable supply of material and energy products. We analyse the climate implications of different scenarios for forestry, bioenergy and wood construction. We consider three main forestry scenarios for Kronoberg County in Sweden, over a 201-year period. The Business-as-usual scenario mirrors today's forestry while in the Production scenario the forest productivity is increased by 40% through more intensive forestry. In the Set-aside scenario 50% of forest land is set-aside for conservation. The Production scenario results in less net carbon dioxide emissions and cumulative radiative forcing compared to the other scenarios, after an initial period of 30–35 years during which the Set-aside scenario has less emissions. In the end of the analysed period, the Production scenario yields strong emission reductions, about ten times greater than the initial reduction in the Set-aside scenario. Also, the Set-aside scenario has higher emissions than Business-as-usual after about 80 years. Increasing the harvest level of slash and stumps results in climate benefits, due to replacement of more fossil fuel. Greatest emission reduction is achieved when biomass replaces coal, and when modular timber buildings are used. In the long run, active forestry with high harvest and efficient utilisation of biomass for replacement of carbon-intensive non-wood products and fuels provides significant climate mitigation, in contrast to setting aside forest land to store more carbon in the forest and reduce the harvest of biomass.
Online Access
Free
Resource Link
Less detail

Mass Timber in High-Rise Buildings: Modular Design and Construction

https://research.thinkwood.com/en/permalink/catalogue2390
Year of Publication
2019
Topic
Design and Systems
Fire
Application
Wood Building Systems
Author
Dorrah, Dalia
Publisher
Sidewalk Labs Toronto
Year of Publication
2019
Country of Publication
Canada
Format
Report
Application
Wood Building Systems
Topic
Design and Systems
Fire
Keywords
Modularization
Fire Safety
Construction Risks
Case Study
Modular Construction
Challenges
Language
English
Research Status
Complete
Summary
The costs of mass timber may be higher, but the added premium on their prices make them economically feasible. Beyond the economics, mass timber structures present a unique opportunity to develop and test the resiliency of the owner organization and its capacity to innovate. A collective effort to strengthen the supply chain in Ontario (especially the manufacturing stage) is one of the key tools to reduce costs. Having a dedicated fire consulting firm and the early engagement of regulatory bodies and consecrators are some of the key means to control risks in this domain. Earlier projects relied on covering/insulating mass timber sections to achieve the required fire requirements. Increasingly, charring is becoming an acceptable means for fire protection. Using Integrated Project Delivery system (IPD) and Building Information Modeling (BIM) can provide the contractual and technical platforms to boost coordination and promote collaborative design and construction.
Online Access
Free
Resource Link
Less detail

Modular Timber Concrete Composite System for Short Span Highway Bridges

https://research.thinkwood.com/en/permalink/catalogue2297
Year of Publication
2019
Topic
Design and Systems
Connections
Material
Timber-Concrete Composite
Glulam (Glue-Laminated Timber)
Application
Bridges and Spans
Author
Liang, Yi
Publisher
University of Toronto
Year of Publication
2019
Country of Publication
Canada
Format
Thesis
Material
Timber-Concrete Composite
Glulam (Glue-Laminated Timber)
Application
Bridges and Spans
Topic
Design and Systems
Connections
Keywords
Modular Construction
Ultra-High Performance Fibre Reinforced Concrete (UHPFRC)
Self-Tapping Screws
Canadian Highway Bridge Design Code
Language
English
Research Status
Complete
Summary
An innovative concept for a modular timber concrete composite system for short span highway bridges has been designed and key components experimentally validated. The proposed system consists of a Ultra-High Performance Fibre Reinforced Concrete(UHPFRC) deck and glue-laminated timer (glulam) girders linked to act compositely together by reinforcing steel bar shear connectors. This composite system has light, stable modules that can be rapidly constructed on site with less special equipment. Simple design checks indicate that the concept satisfies all serviceability limit state(SLS) and ultimate limit state(ULS) requirements of the Canadian Highway Bridge Design Code. Pull-out tests characterized the embedment lengths of 20M steel bar connectors to be 10 bar-diameters in UHPFRC. Push-off tests determined the embedment lengths of the same bars to be 30 bar-diameters glued into the timber girders. The slip modulus of the connectors is determined to be 67 kN/mm. The stiffness of the crosswise self-tapping screw connectors were tested and found to be structurally insignificant in this application. The excellent tensile and cracking properties of the reinforced UHPFRC deck was experimentally verified. A small amount of reinforcement would further improve the ductility of the UPHFRC deck system.
Online Access
Free
Resource Link
Less detail

Timber Based Prefabricated Single Modular Housing: A Brief Comparison to the Auto Industry

https://research.thinkwood.com/en/permalink/catalogue2137
Year of Publication
2019
Topic
Design and Systems
Energy Performance
Market and Adoption
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems

Mass Timber in High-Rise Buildings: Modular Design and Construction; Permitting and Contracting Issues

https://research.thinkwood.com/en/permalink/catalogue2144
Year of Publication
2019
Topic
Market and Adoption
Application
Wood Building Systems
Author
Dorrah, Dalia
El-Diraby, Tamer
Year of Publication
2019
Country of Publication
Canada
Format
Conference Paper
Application
Wood Building Systems
Topic
Market and Adoption
Keywords
High-Rise
Modular Construction
Building Codes
Language
English
Conference
Modular and Offsite Construction Summit
Research Status
Complete
Online Access
Free
Resource Link
Less detail

Harmonization of Structural and Functional Lifespans of Prefabricated Residential Buildings

https://research.thinkwood.com/en/permalink/catalogue2744
Year of Publication
2020
Topic
Serviceability
Design and Systems
Material
CLT (Cross-Laminated Timber)
Timber-Concrete Composite
Application
Wood Building Systems
Hybrid Building Systems
Author
Kokas, Balázs
Balogh, Jeno
Borsos, Ágnes
Gabriella, Medvegy
Bachmann, Bálint
Publisher
IIETA
Year of Publication
2020
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Timber-Concrete Composite
Application
Wood Building Systems
Hybrid Building Systems
Topic
Serviceability
Design and Systems
Keywords
Prefabrication
Modular
Sustainability
Structural Lifespan
Functional Lifespan
Language
English
Research Status
Complete
Series
International Journal of Design & Nature and Ecodynamics
Summary
Technological developments and social trends can create demand for new building functionalities, necessitating the adaptation of existing buildings. This paper presents the development of a modular building structural system that provides for the harmonization between the structural and functional lifespans of a building in order to achieve greater sustainability. The limitations of the existing prefabricated urban buildings with respect to their adaptability are contrasted with the proposed solution. The use of prefabricated engineered materials, such as cross laminated timber (CLT) and CLT-concrete composites, in conjunction with a modular system, reduces any climatic effects. The inherent advantages of incorporating detachable connections allows for the necessary structural adaptability, subsequently harmonizing and elongating the structural and functional lifespans. The resulting sustainable concept, when applied to residential buildings, could serve as a solution to address projections of future urban growth.
Online Access
Free
Resource Link
Less detail

Hybrid CLT-Based Modular Construction Systems for Prefabricated Buildings

https://research.thinkwood.com/en/permalink/catalogue1901
Year of Publication
2018
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Steel-Timber Composite
Application
Wood Building Systems
Floors
Walls

The Merits of Varying Forms of Mass Timber Products for Offsite and Modular Construction

https://research.thinkwood.com/en/permalink/catalogue2677
Year of Publication
2018
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
NLT (Nail-Laminated Timber)
DLT (Dowel Laminated Timber)
Author
Hairstans, Robert
Smith, Ryan
Wilson, Peter
Year of Publication
2018
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
NLT (Nail-Laminated Timber)
DLT (Dowel Laminated Timber)
Topic
Design and Systems
Keywords
Solid Laminate Timber Systems
Offsite
Modular
Structural Composite Lumber
Timber
Language
English
Conference
Modular and Offsite Construction Summit
Research Status
Complete
Summary
Mass timber is a family of Solid Laminate Timber Systems (SLTS) formed from smaller sections of timber connected by glue, mechanical fixings, moisture movement or a combination of methods. These products, which include Structural Composite Lumber, GluLam, Cross Lam, Nail Lam and Dowel Lam (or Brettstapel), have over the past two decades seen an extraordinary upsurge in use internationally. This global phenomenon has been driven by a greater emphasis on the sustainable use of renewable resources and by significant technological developments in the manufacture of SLTS. This research paper considers the merits of each of these products, their manufacturing processes and the corresponding quality assurance requirements necessary for successful project delivery. The paper describes the advantages and barriers to the use of the mass timber and provides an overview of the various aspects to be considered during design for offsite and modular construction. The work presented also provides case studies of how these products have been researched and utilised into live projects in the UK utilising local resource resulting in the formation of new supply chain arrangements. The work further explains the advantages of the respective systems for the given application including information on species selection, connection systems employed and the necessary onsite and offsite management approaches deployed.
Online Access
Free
Resource Link
Less detail

Connections for Stackable Heavy Timber Modules in Midrise to Tall Wood Buildings

https://research.thinkwood.com/en/permalink/catalogue2087
Year of Publication
2019
Topic
Connections
Design and Systems
Seismic
Material
LVL (Laminated Veneer Lumber)
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Zhang, Chao
Lee, George
Lam, Frank
Organization
University of British Columbia
Year of Publication
2019
Country of Publication
Canada
Format
Report
Material
LVL (Laminated Veneer Lumber)
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Connections
Design and Systems
Seismic
Keywords
Modular
Intra-module Connection
Inter-module Vertical Connection
Inter-module horizontal Connection
Mid-Rise
Tall Wood
Screws
Load Transfer
Steel Angle Bracket
Stiffness
Strength
Ductility
Language
English
Research Status
Complete
Summary
In Phase I (2018-19) of this project on Prefabricated Heavy Timber Modular Construction, three major types of connections used in a stackable modular building were studied: intramodule connection, inter-module vertical connection, and inter-module horizontal connection. The load requirement and major design criteria were identified...
Online Access
Free
Resource Link
Less detail

Disproportionate Collapse Mitigation in Tall Mass Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue2574
Year of Publication
2019
Topic
Design and Systems
Author
Daneshvar, Hossein
Chui, Ying Hei
Year of Publication
2019
Country of Publication
Canada
Format
Conference Paper
Topic
Design and Systems
Keywords
Tall Timber Buildings
Collapse
Structural Robustness
Performance
Safety
Language
English
Conference
Modular and Offsite Construction Summit
Research Status
Complete
Online Access
Free
Resource Link
Less detail

Canadian Mass Timber Demonstration Projects Initiatives

https://research.thinkwood.com/en/permalink/catalogue2147
Year of Publication
2019
Topic
Market and Adoption
Application
Wood Building Systems
Author
Mohammad, Mohammad
Tourrilhes, Julie
Coxford, Richard
Williamson, Miranda
Year of Publication
2019
Country of Publication
Canada
Format
Conference Paper
Application
Wood Building Systems
Topic
Market and Adoption
Keywords
High-Rise
Non-Residential
Building Codes
Canada
Tall Wood
Language
English
Conference
Modular and Offsite Construction Summit
Research Status
Complete
Online Access
Free
Resource Link
Less detail

Serviceability Performance of Timber Concrete Composite Floors

https://research.thinkwood.com/en/permalink/catalogue2353
Year of Publication
2019
Topic
Serviceability
Material
Timber-Concrete Composite
Application
Floors
Author
Tannert, Thomas
Mehdi Ebadi, Md
Gerber, Adam
Year of Publication
2019
Country of Publication
Canada
Format
Journal Article
Material
Timber-Concrete Composite
Application
Floors
Topic
Serviceability
Keywords
Hybrid
Concrete Slab
Bending
Vibration
Long-term Performance
Stiffness
Language
English
Research Status
Complete
Series
Modular and Offsite Construction (MOC)
Notes
DOI: https://doi.org/10.29173/mocs95
Online Access
Free
Resource Link
Less detail

Lateral Performance of Cross-laminated Timber Shear Walls: Analytical and Numerical Investigations

https://research.thinkwood.com/en/permalink/catalogue2425
Year of Publication
2019
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Walls

Numerical Modelling Analysis of Angle Bracket Connections Used in Cross Laminated Timber Constructions

https://research.thinkwood.com/en/permalink/catalogue2445
Year of Publication
2019
Topic
Connections
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Walls
Floors
Author
Rezvani, Saeed
Zhou, Lina
Year of Publication
2019
Country of Publication
Canada
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Walls
Floors
Topic
Connections
Keywords
Finite Element
Abaqus
Three Dimensional Analysis
Angle Bracket
Panels
Load
Language
English
Research Status
Complete
Series
Modular and Offsite Construction (MOC) Summit Proceedings
Online Access
Free
Resource Link
Less detail

Structural Design and Modelling Method for the Post-Tensioned CLT Shear Wall Structures

https://research.thinkwood.com/en/permalink/catalogue2149
Year of Publication
2019
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Walls

Cross-Laminated Timber Shear Walls in Balloon Construction: Seismic Performance of Steel Connections

https://research.thinkwood.com/en/permalink/catalogue2413
Year of Publication
2019
Topic
Seismic
Connections
Material
CLT (Cross-Laminated Timber)
Application
Walls

31 records – page 1 of 2.