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6 records – page 1 of 1.

Computational design and on-site mobile robotic construction of an adaptive reinforcement beam network for cross-laminated timber slab panels

https://research.thinkwood.com/en/permalink/catalogue3192
Year of Publication
2022
Topic
Site Construction Management
Material
CLT (Cross-Laminated Timber)
Author
Chai, Hua
Wagner, Hans Jakob
Guo, Zhixian
Qi, Yue
Menges, Achim
Yuan, Philip F.
Organization
Tongji University
University of Stuttgart
Publisher
Elsevier
Year of Publication
2022
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Site Construction Management
Keywords
Mobile Robot
Timber Slab
On-site Construction
Robotic Timber Construction
Computational Design
Research Status
Complete
Series
Automation in Construction
Summary
Timber slabs design is currently limited to grid layouts derived from prefabricated rectangular panels. The lack of adaptability of timber slabs to accommodate multiple span directions makes it difficult to compete with reinforced concrete slabs constructed on site. This paper describes an adaptive slab system composed of thin Cross-Laminated Timber (CLT) panels and robot-fabricated beam networks for reinforcement. The beam network was developed through intricate negotiation of structural optimization and fabrication constraints, which can adapt to changes in slab span and directions. A mobile robot platform that allows for on-site assembly of timber sticks into continuous beam networks was developed. The robot platform and slab system were tested with a case study pavilion. The co-design of the robot platform and the slab system fills the gap in on-site robotic timber construction and expands the design freedom of timber buildings.
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Environmental Response of a CLT Floor Panel: Lessons for Moisture Management and Monitoring of Mass Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue2161
Year of Publication
2018
Topic
Site Construction Management
Serviceability
Moisture
Material
CLT (Cross-Laminated Timber)
Application
Floors
Author
Schmidt, Evan
Riggio, Mariapaola
Barbosa, André
Mugabo, Ignace
Organization
Oregon State University
Publisher
ScienceDirect
Year of Publication
2018
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Floors
Topic
Site Construction Management
Serviceability
Moisture
Keywords
Moisture
Hygrothermal Performance
On-Site
Research Status
Complete
Series
Building and Environment
Summary
Cross-laminated timber (CLT) is becoming increasingly adopted into North American construction, yet little is known about the impacts of environmental exposure (e.g., to rain during construction) on its long-term performance. The lack of protocols for on-site moisture protection in North America makes it a pressing matter to determine general moisture responses of this material in order to establish a behavioral baseline for practitioners and future researchers. A CLT floor panel sample was exposed to cycles of wetting and drying in an environmental chamber. During these cycles, physical and geometrical properties of the panel were monitored. Testing results indicate that discontinuities in the layup CLT affects the hygroscopic behavior of the product. While the panel showed high dimensional stability, it also exhibited checking, cupping, and interfacial shearing after cycling. Bending test results before and after cycling indicated a reduction of the structural capacity due to the weathering.
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Obstacles Preventing the Off-Site Prefabrication of Timber and MEP Services: Qualitative Analyses from Builders and Suppliers in Australia

https://research.thinkwood.com/en/permalink/catalogue3160
Year of Publication
2022
Topic
General Information
Author
Lopez, Robert
Chong, Heap-Yih
Pereira, Conrad
Organization
Curtin University
Nanjing Audit University
Editor
Santos, Paulo
Publisher
MDPI
Year of Publication
2022
Format
Journal Article
Topic
General Information
Keywords
Construction
Collaboration
Coordination
MEP
Off-site
On-Site
In Situ
Prefabrication
Builder
Supplier
Australia
Research Status
Complete
Series
Buildings
Summary
Limited empirical and qualitative studies focus on the detailed processes and obstacles for coordinating off-site prefabrication between builders and suppliers. This research aims to identify and address the obstacles that currently prevent the further expansion of off-site prefabrication, with a research scope on timber and mechanical/electrical/plumbing (MEP) services in construction projects. The focal point of this research is to highlight their obstacles. A total of forty interviews were conducted and analyzed from four builders’ organizations and four suppliers’ organizations to ascertain their obstacles in coordinating the practice of off-site prefabrication. The results found the builder’s obstacles were sustainability, quality assurance (QA), mass production, CAD/BIM, technological support, commercial arrangements, system building, buffering in supply, schedule monitoring, productivity, flexibility, engagement, risks, and multiple supply arrangements. The supplier’s obstacles were design, financing and subcontracting, coordination, recognized practices, risks, multiple supply arrangements, and constraints. Moreover, the builders and suppliers had identified some ways to harmonize off-site prefabrication of timber. Some examples of timber prefabrication technology include joinery, doors and/or windows, structural floor/wall/roof frames, partitions, trusses, stairs, balustrades, and others. MEP services with in situ construction comprise the use of power sources and working coordination. The most important outcome of this investigation is that these obstacles can be addressed through collaboration and coordination. This is because there is a traditionally a lack of collaboration amongst builders and their suppliers. Furthermore, there is a lack of coordination between them in general. The research contributes to the improved timber and MEP services collaboration and coordination in off-site prefabrication, which can be referred to by other approaches of modular construction.
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Free
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Productivity in Multi-storey Mass Timber Construction

https://research.thinkwood.com/en/permalink/catalogue2096
Year of Publication
2019
Topic
Site Construction Management
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Forsythe, Perry
Ahmadian Fard Fini, Alireza
Organization
Forest and Wood Products Australia
Year of Publication
2019
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Site Construction Management
Keywords
On-Site
Installation
Multi-Storey
Productivity
Research Status
Complete
Summary
The aim of this project was to quantitatively measure the onsite installation productivity of Cross Laminated Timber in multi-storey building projects. Specifically, the work aims to improve an evidence-based understanding of expectations concerning: 1. The speed and productivity of CLT installation. 2. Assumptions when planning CLT processes onsite. 3. Benchmarks to facilitate comparisons between CLT and other forms of construction. 4. Guidance about process improvement on-site. Multi-storey CLT buildings are relatively new to Australia and so an in-depth case study of a specific building project was the chosen method of undertaking the research. Time-lapse photography was used to gather site assembly information and the resulting footage was converted into quantitative data including the number of worker hours and crane hours used in installing the wall and floor panel areas involved. Statistical analysis was used to derive productivity rates (m2/hour), floor cycle times and other related findings, concerning the installation of CLT.
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Wetting and Drying Performance of Cross-Laminated Timber Related to On-Site Moisture Protections: Field Measurements and Hygrothermal Simulations

https://research.thinkwood.com/en/permalink/catalogue2711
Year of Publication
2020
Topic
Moisture
Site Construction Management
Material
CLT (Cross-Laminated Timber)
Author
Wang, Lin
Wang, Jieying
Ge, Hua
Organization
Concordia University
FPInnovations
Publisher
EDP Sciences
Year of Publication
2020
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Moisture
Site Construction Management
Keywords
Hygrothermal
Simulation
Hygrothermal Models
On-site Wetting
Conference
Nordic Symposium on Building Physics
Research Status
Complete
Summary
Cross-laminated timber (CLT) panels are increasingly used in mid-rise buildings or even taller structures in North America. However, prolonged exposure to moisture during construction and in service is a durability concern for most wood products including CLT. To investigate practical solutions for reducing on-site wetting of mass timber construction, CLT specimens with a range of moisture protection measures, in six groups were tested in the backyard of FPInnovations’ Vancouver laboratory from Oct. 2017 to Jan. 2018. This study investigates the wetting and drying behaviours of the tested CLT specimens through 2-D hygrothermal simulations. The simulations are performed for base specimens (no protection measures) of group 1 (without joint or plywood spline) and group 2 (with a butt joint and plywood spline). For group 1, three data sources of material properties are used to create the models, and the data that led to the best agreement between simulations and measurement are used for creating the models of group 2. For group 2, two types of hygrothermal models are created with or without considering the differences in water absorption between the transverse and the longitudinal grain orientations. In addition, rain penetration is taken into account for the joint area. It is found that the model with considering the differences between transverse and longitudinal grain orientations shows a better agreement than that without considering such differences.
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Wetting and Drying Performance Related To On-Site Moisture Protection of Cross-Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue1169
Year of Publication
2018
Topic
Moisture
Site Construction Management
Material
CLT (Cross-Laminated Timber)
Application
Hybrid Building Systems
Wood Building Systems
Author
Wang, Jieying
Organization
FPInnovations
Year of Publication
2018
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Hybrid Building Systems
Wood Building Systems
Topic
Moisture
Site Construction Management
Keywords
On-Site
Moisture Management
Water Repellants
Rain
Research Status
Complete
Summary
Practical solutions are needed for on-site moisture management of mass timber construction. Six groups of cross-laminated timber (CLT) specimens, together with reference specimens including plywood, OSB, and nail-laminated timber were assessed for their wetting and drying behaviour. The focus of this study was to assess the effectiveness of water repellents and membranes installed on CLT in preventing the wetting that can be caused by, for example, rain during outdoor exposure, installation of wet concrete topping, or sitting on a damp concrete slab. Seven water repellent products covering a range of formulations and three membranes including a self-adhered vapour-permeable membrane, a self-adhered vapour-impermeable membrane, and a lumber wrap were assessed as potential temporary moisture protection measures. Implications for moisture protection practices based on the test were summarized at the end of this report.
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Free
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6 records – page 1 of 1.