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10 records – page 1 of 1.

Valuation of the Composite Action of Lightweight and Prefabricated Concrete-Wood Floors for Multi-Storey Buildings

https://research.thinkwood.com/en/permalink/catalogue2666
Topic
Connections
Design and Systems
Mechanical Properties
Material
Timber-Concrete Composite
Application
Floors
Wood Building Systems
Organization
Université Laval
Country of Publication
Canada
Material
Timber-Concrete Composite
Application
Floors
Wood Building Systems
Topic
Connections
Design and Systems
Mechanical Properties
Keywords
Finite Element Analysis
Span Limits
Shear Test
Bending Test
Research Status
In Progress
Notes
Project contact is Luca Sorelli at Université Laval
Summary
This project aims to develop a new precast wood / concrete floor system that can push the span limits in multi-storey wood buildings. The multidisciplinary methodology includes a finite element analysis technique using the “DDuctileTCS” software developed at CIRCERB, shear tests on connections, bending tests of the composite beam and an extension of technical standards for the design of composite structures. This project will develop solutions to optimize the composite action and vibration of long-span precast and mixed floors. The methodology consists of: (i) analysis of systems and optimization of shapes by numerical finite element techniques; (ii) connection shear tests; (iii) proof of concept on a prototype beam in the laboratory.
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Investigating the Structural Performance of a Modular Prefabricated Dry-assembly Mass Timber-steel Hybrid Floor Element

https://research.thinkwood.com/en/permalink/catalogue2816
Topic
Connections
Design and Systems
Material
CLT (Cross-Laminated Timber)
Steel-Timber Composite
Application
Floors
Organization
University of British Columbia
Country of Publication
Canada
Material
CLT (Cross-Laminated Timber)
Steel-Timber Composite
Application
Floors
Topic
Connections
Design and Systems
Keywords
Steel Beams
Steel-timber Composite Floors
Research Status
In Progress
Notes
Project contact is Cristiano Loss at the University of British Columbia
Summary
This research is focused on bridging the current knowledge gap on steel-timber composite floors, where CLT panels are connected to steel beams. Most of the current design codes lack provisions and guidelines for the design of steel-timber composite floors.
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Development of Innovative MTP-Concrete Composite Floor System with Notched Timber Connection

https://research.thinkwood.com/en/permalink/catalogue2659
Topic
Connections
Design and Systems
Mechanical Properties
Material
Timber-Concrete Composite
Application
Floors
Author
Zhang, Lei
Organization
University of Alberta
Country of Publication
Canada
Material
Timber-Concrete Composite
Application
Floors
Topic
Connections
Design and Systems
Mechanical Properties
Keywords
Stiffness
Strength
Notched Connections
Shrinkage
Research Status
In Progress
Summary
The objective of this research is to develop optimum notch profile to achieve maximum connection stiffness and strength properties, characterize notched timber connection MTP-concrete floor systems, including concrete shrinkage and develop floor system details and design procedure.
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Prefabricated Timber-Concrete Composite System

https://research.thinkwood.com/en/permalink/catalogue910
Year of Publication
2012
Topic
Design and Systems
Mechanical Properties
Connections
Material
Timber-Concrete Composite
Application
Floors
Author
Moar, Franco
Organization
Lund University
Year of Publication
2012
Country of Publication
Sweden
Format
Thesis
Material
Timber-Concrete Composite
Application
Floors
Topic
Design and Systems
Mechanical Properties
Connections
Keywords
FE model
Bending Tests
Withdrawal Tests
Compression Tests
Self-Tapping Screws
Prefabrication
Language
English
Research Status
Complete
Summary
Timber-concrete composite structures were originally developed for upgrading existing timber oors, but during last decades, they have new applications in multistorey buildings. Most of the research performed on these structures has focused on systems in which wet concrete is cast on top of timber beams with mounted connectors. Recently investigations on composite systems were performed at Luleå University of Technology in Sweden, in which the concrete slab is prefabricated off-site with the connectors already embedded and then connected on-site to the timber joists. Similar studies have been carried out also on timber-concrete composite structures with prefabricated FRC slabs at Lund University in Sweden. Two kinds of shear connectors were incorporated in the prefabricated FRC concrete slabs. These last systems can be considered globally as partially prefabricated structures because only the slabs were cast off-site with already inserted shear connectors and then the connection with the timber beams is done on the building site. An innovative composite system for floor applications is presented in this thesis. The entire structure is prefabricated off-side, transported and direct mounted to the building on site, that can be seen as full prefabricated structures. Noticeable benefits of a full prefabricated structure are that the moving work from the building site to the workshop reduces construction costs, is more simple and fast of manufacture and erect, and of sure, has better quality, that means more durability. Self-tapping full-threaded screws to connect concrete slabs to timber beam were used. Dimensions of the composite beams and the spacing between the screws has been chosen by discussing different FE model in order to reach the optimal solution. The experimental campaign included: (i) two short-time bending tests carried out on two dierent full-scale specimens, (ii) dynamic tests conducted on one full-scale specimen, (iii) long-time bending test carried out on one full-scale specimen, (iv) compression tests on three cubes of concrete, (v) nine withdrawal tests of the screws with different depth in the concrete. The results of the experimental tests show that the composite beams have a very high level of resistance and stiffness and also allow to reach a high degree of efficiency. Last, comparisons between FE results, analytical calculations and experimental values have been performed and from them it can be concluded that FE model and theoretical calculations well interpret the behavior of the composite structure and provide reliable results.
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Study on Performance of Timber-Steel Composite Beams with Different Shapes of Steel Components

https://research.thinkwood.com/en/permalink/catalogue1762
Year of Publication
2016
Topic
Mechanical Properties
Material
Steel-Timber Composite
Application
Beams
Author
Hsu, Tzu-Ling
Chang, Feng-Cheng
Tsai, Meng-Ting
Le, Truong-Di-Ha
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Steel-Timber Composite
Application
Beams
Topic
Mechanical Properties
Keywords
Bending Stress
Deflection
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 5183-5189
Summary
Nowadays, the composite of steel and concrete is quite popular but it is also important to improve and develop the structural systems especially the construction and design of wooden structure. Furthermore, wood components would reduce the risk of buckling on individual activity of steel and thus leads to more efficient hybrid steel-timber...
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Free
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CNC-Fabricated Dovetails for Joints of Prefabricated CLT Components

https://research.thinkwood.com/en/permalink/catalogue1124
Year of Publication
2014
Topic
Connections
Material
CLT (Cross-Laminated Timber)
Author
Robeller, Christopher
Hahn, Benjamin
Mayencour, Paul
Weinand, Yves
Publisher
Springer-Verlag
Year of Publication
2014
Country of Publication
Germany
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Connections
Keywords
Prefabrication
CNC
Dovetail
Language
German
Research Status
Complete
Series
Bauingenieur
ISSN
0005-6650
Summary
The widely available automated prefabrication in timber construction companies, as well as modern CAD software with application programing interfaces, allow for the design and production of increasingly geometrically complex building components. This development also enables and demands at the same time advanced joinery techniques. Analog to the developments in timber framing, this article presents the adaptation of a traditional wood-wood joinery technique from cabinetmaking, on the casestudy of a shell structure built from curved cross-laminated timber (CLT) panels. The dovetail-joints allow for a load-bearing glued joint between the CLT panels. They provide an aesthetic, visible connection and simplify the assembly through their integrated locator features.
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Free
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The Design of a Semi-Prefabricated LVL-Concrete Composite Floor

https://research.thinkwood.com/en/permalink/catalogue103
Year of Publication
2012
Topic
Design and Systems
Material
LVL (Laminated Veneer Lumber)
Timber-Concrete Composite
Application
Floors
Author
Yeoh, David
Fragiacomo, Massimo
Publisher
Hindawi Publishing Corporation
Year of Publication
2012
Country of Publication
Egypt
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Timber-Concrete Composite
Application
Floors
Topic
Design and Systems
Keywords
Flexural Stiffness Method
Prefabrication
Language
English
Research Status
Complete
Series
Advances in Civil Engineering
Summary
This paper describes the design of a novel semi-prefabricated LVL-concrete composite floor that has been developed in New Zealand. In this solution, the floor units made from LVL joists and plywood are prefabricated in the factory and transported to the building site. The units are then lifted onto the supports and connected to the main frames of the building and to the adjacent units. Finally, a concrete topping is poured on top of the units in order to form a continuous slab connecting all the units. Rectangular notches cut from the LVL joists and reinforced with coach screws provide the composite action between the concrete slab and the LVL joists. This system proved to be an effective modular solution that ensures rapid construction. A design procedure based on the use of the effective flexural stiffness method, also known as the “gamma method” is proposed for the design of the composite floor at ultimate and serviceability limit states, in the short and long term. By comparison with the experimental results, it is shown that the proposed method leads to conservative design. A step-by-step design worked example of this novel semi-prefabricated composite floor concludes the paper.
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Free
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Innovative Technology for Mass Timber and Hybrid Modular Buildings

https://research.thinkwood.com/en/permalink/catalogue2801
Topic
Design and Systems
Seismic
Wind
Connections
Application
Wood Building Systems
Hybrid Building Systems
Organization
Oregon State University
Country of Publication
United States
Application
Wood Building Systems
Hybrid Building Systems
Topic
Design and Systems
Seismic
Wind
Connections
Keywords
Mass Timber
Modular Construction
Ductility
Overstrength
High-Rise
Tall Wood Buildings
Interdisciplinary Research
Wind Tunnel Test
Research Status
In Progress
Notes
Project contact is Erica Fischer at Oregon State University
Summary
This Faculty Early Career Development (CAREER) award will create innovative building technology that will enable mass timber modular construction as a building solution to many of the issues the nation's major cities face today. The architecture, engineering, and construction (AEC) sector is on the cusp of a significant disruption that will change the way buildings are manufactured, assembled, and designed, the catalyst of which is the integration of building information models (BIM) and automated construction and manufacturing. This disruption will significantly impact structural engineers. With the streamlining of building manufacturing, assembling, and design, engineers will need to take advantage of three opportunities: (1) design for constructability, (2) design for manufacturing, and (3) design for the whole life of the building (considering future modifications, maintenance, and easily replacing parts of the building). Modular construction, as one method to take advantage of these three opportunities, can address labor and housing shortages that exist in almost every U.S. city today and also can provide rapid construction methods for post-disaster reconstruction and additional patient care facilities. This research will contribute to the state of Oregon’s economy, which has made significant investments in mass timber production, manufacturing, and research. This research will be complemented through the development of best practices for using interdisciplinary, collaborative classroom environments to enhance engineering identities of underrepresented minorities and women at the graduate level. This award will support the National Science Foundation (NSF) role in the National Earthquake Hazards Reduction Program and the National Windstorm Impact Reduction Program. The specific goal of this research is to develop a novel framework for robust and ductile mass timber modular construction that can be applied to buildings with varying lateral force resisting systems. Through this framework, the relationship between the rigidity of modular interconnections and overall structural behavior will be investigated. The research objectives of this project are to: (1) quantify the demands in interconnections that provide ductility when the building framing is subjected to combined gravity and lateral forces (seismic and wind); (2) quantify the impact of interconnection configuration and design on the ability of interconnections to meet the strength and serviceability performance criteria for mass timber high-rise modular buildings; (3) quantify ductility and overstrength for mass timber modular construction and explore applicability of conventional seismic performance factors and how these factors influence the adjusted collapse margin ratio for archetype buildings; (4) explore the influence of interconnection stiffness on the behavior of high-rise modular mass timber buildings subjected to wind demands; and (5) explore the relationship between team-focused and interdisciplinary educational practices with engineering identity and knowledge retention. New connection technology will be created and its contribution to the overall building behavior will be investigated through a rigorous testing plan and complex physics-based numerical simulations of archetype buildings subjected to combined gravity and lateral loads (seismic and wind). This research is a critical first step to develop innovative technology that will change how buildings are designed, manufactured, and assembled. This project will enable the Principal Investigator to establish interdisciplinary research, teaching, and mentorship in the area of mass timber and hybrid construction. This research will use the NSF-supported Natural Hazards Engineering Research Infrastructure (NHERI) Boundary Layer Wind Tunnel facility at the University of Florida. Experimental datasets will be archived in the NHERI Data Depot (https://www.DesignSafe-ci.org) and made publicly available.
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Structural and Thermal Behaviour of a Timber-Concrete Prefabricated Composite Wall System

https://research.thinkwood.com/en/permalink/catalogue247
Year of Publication
2015
Topic
Design and Systems
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Timber-Concrete Composite
Application
Walls
Author
Destro, Riccardo
Boscato, Giosuè
Mazzali, Ugo
Russo, Salvatore
Peron, Fabio
Romagnoni, Piercarlo
Publisher
ScienceDirect
Year of Publication
2015
Country of Publication
Netherlands
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Timber-Concrete Composite
Application
Walls
Topic
Design and Systems
Mechanical Properties
Keywords
Structural Behaviour
Thermal Behaviour
Prefabrication
Quasi-Static
In-Plane Tests
Language
English
Research Status
Complete
Series
Energy Procedia
Summary
This paper presents the analysis of the structural and thermal behaviour of an timber-concrete prefabricated composite wall system, the Concrete Glulam Framed Panel (CGFP) which is a panel made of a concrete slab and a structural glulam frame. The research analyses the structural performance with quasi-static in-plane tests, focused on the in-plane strength and stiffness of individual panels, and the thermal behaviour of the system with steady state tests using an hot box apparatus. The results validate the efficacy of proposed system ensuring the resistance and the dissipative structural behaviour through the hierarchy response characterized by the wood frame, the braced reinforced concrete panel of the singular module and by the rocking effects of global system.
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Free
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Steel-Timber Versus Steel-Concrete Composite Floors: A Numerical Study

https://research.thinkwood.com/en/permalink/catalogue1765
Year of Publication
2016
Topic
Mechanical Properties
Material
Steel-Timber Composite
LVL (Laminated Veneer Lumber)
Application
Floors
Author
Keipour, Nicka
Valipour, Hamid
Bradford, Mark
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Steel-Timber Composite
LVL (Laminated Veneer Lumber)
Application
Floors
Topic
Mechanical Properties
Keywords
Screws
Finite Element Model
Load Carrying Capacity
Strength
Stiffness
Composite Action
Brittle Failure
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 5208-5216
Summary
Concrete is the most widely used construction material in the world. This material causes formation and release of CO2 and high energy consumption during manufacturing. One way to decrease concrete consumption negative consequences is to replace it with lower needed primary energy materials, like timber. The engineered wood products such as laminated veneer lumber (LVL)...
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10 records – page 1 of 1.