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9 records – page 1 of 1.

Development of Novel Standardized Structural Timber Elements Using Wood-Wood Connections

https://research.thinkwood.com/en/permalink/catalogue2747
Year of Publication
2020
Topic
Design and Systems
Connections
Material
CLT (Cross-Laminated Timber)
Author
Gamerro, Julien
Publisher
Lausanne, EPFL
Year of Publication
2020
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Topic
Design and Systems
Connections
Keywords
Timber Construction
Connections
Digital Fabrication
Design for Manufacturing and Assembly
Structural Design
Structural Frameworks
Semi-Rigid Connection
Experimental
Shear Strength
Compression Strength
Wood-Wood Connections
Bending Test
Bending Stiffness
Numerical Model
Load Carrying Capacity
Slip Modulus
Language
English
Research Status
Complete
Summary
Traditional wood-wood connections, widely used in the past, have been progressively replaced by steel fasteners and bonding processes in modern timber constructions. However, the emergence of digital fabrication and innovative engineered timber products have offered new design possibilities for wood-wood connections. The design-to-production workflow has evolved considerably over the last few decades, such that a large number of connections with various geometries can now be easily produced. These connections have become a cost-competitive alternative for the edgewise connection of thin timber panels. Several challenges remain in order to broaden the use of this specific joining technique into common timber construction practice: (1) prove the applicability at the building scale, (2) propose a standardized construction system, (3) develop a convenient calculation model for practice, and (4) investigate the mechanical behavior of wood-wood connections. The first building implementation of digitally produced through-tenon connections for a folded-plate structure is presented in this work. Specific computational tools for the design and manufacture of more than 300 different plates were efficiently applied in a multi-stakeholder project environment. Cross-laminated timber panels were investigated for the first time, and the potential of such connections was demonstrated for different engineered timber products. Moreover, this work demonstrated the feasibility of this construction system at the building scale. For a more resilient and locally distributed construction process, a standardized system using through-tenon connections and commonly available small panels was developed to reconstitute basic housing components. Based on a case-study with industry partners, the fabrication and assembly processes were validated with prototypes made of oriented strand board. Their structural performance was investigated by means of a numerical model and a comparison with glued and nailed assemblies. The results showed that through-tenon connections are a viable alternative to commonly used mechanical fasteners. So far, the structural analysis of such construction systems has been mainly achieved with complex finite element models, not in line with the simplicity of basic housing elements. A convenient calculation model for practice, which can capture the semi-rigid behavior of the connections and predict the effective bending stiffness, was thus introduced and subjected to large-scale bending tests. The proposed model was in good agreement with the experimental results, highlighting the importance of the connection behavior. The in-plane behavior of through-tenon connections for several timber panel materials was characterized through an experimental campaign to determine the load-carrying capacity and slip modulus required for calculation models. Based on the test results, existing guidelines were evaluated to safely apply these connections in structural elements while a finite element model was developed to approximate their performance. This work constitutes a firm basis for the optimization of design guidelines and the creation of an extensive database on digitally produced wood-wood connections. Finally, this thesis provides a convenient design framework for the newly developed standardized timber construction system and a solid foundation for research into digitally produced wood-wood connections.
Online Access
Free
Resource Link
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Robotic Fabrication of Nail Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue2493
Year of Publication
2019
Topic
Design and Systems
Material
NLT (Nail-Laminated Timber)
Application
Wood Building Systems

Performance of Glue-Laminated Beams from Malaysian Dark Red Meranti Timber

https://research.thinkwood.com/en/permalink/catalogue1822
Year of Publication
2018
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams

Affordances of Complexity: Evaluation of a Robotic Production Process for Segmented Timber Shell Structures

https://research.thinkwood.com/en/permalink/catalogue1913
Year of Publication
2018
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Shell Structures
Author
Krieg, Oliver David
Bechert, Simon
Groenewolt, Abel
Horn, Rafael
Knippers, Jan
Menges, Achim
Publisher
Intergrated Digital Conference (INDICO)
Year of Publication
2018
Country of Publication
Korea
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Shell Structures
Topic
Design and Systems
Keywords
Robotic Fabrication
Computational Design
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 20-23, 2018, Seoul, Republic of Korea
Online Access
Free
Resource Link
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Fire Testing for Framework Office Building in Portland, OR

https://research.thinkwood.com/en/permalink/catalogue1828
Year of Publication
2017
Topic
Fire
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Beams
Columns
Organization
SWRI
Year of Publication
2017
Country of Publication
United States
Format
Report
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Beams
Columns
Topic
Fire
Keywords
Fire Endurance Tests
Connections
Assembly
Fabrication
Thermocouples
Beam Column Connection
Language
English
Research Status
Complete
Series
Framework: An Urban + Rural Design
Summary
A. Fire Test Results Summary B. Test 1a (Test 1): Beam-Exterior Column Connection Report C. Test 1a (Test 2): Beam-Exterior Column Connection Report D. Test 1a (Test 3): Beam-Exterior Column Connection Report E. Test 1a (Test 4): Beam-Exterior Column Connection Report F. Test 1b (Test 1): CLT Deck to Beam Report G. Test 1b (Test 2): CLT Deck to Beam Report H. Test 1b (Test 3): CLT Deck to Beam Report I. Test 1c: Penetrations Fire Resistance Rating Report (TBD) J. Test 1d: Wall Fire Resistance Rating Report
Online Access
Free
Resource Link
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Design Process of a Free-Form Structure Using CLT Panels - Analysis of an Architectural Large Scale Structure

https://research.thinkwood.com/en/permalink/catalogue1640
Year of Publication
2016
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Author
Tolszczuk-Leclerc, Zoé
Bernier-Lavigne, Samuel
Salenikovich, Alexander
Potvin, André
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Design and Systems
Keywords
Fabrication
CNC
Free-Form
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 3179-3186
Summary
This research is about the design process, development and fabrication of a free-form structure in crosslaminated timber (CLT) panels. Since sustainability, ecology and structural design are now relevant in any building project, the purpose of this research is to demonstrate that CLT panels can be used as an ecoresponsive strategy based on a building form. This paper presents the use of a tessellation construction system for designing and producing a freeform surface in CLT for a specific regional and industrial context. The research/creation process and the retroactive simulation generated by the parametric modelling software enabled the development of a singular architectural project where the structural aspect and the manufacturing are the inherent part of the integrated design process. Finally, the cutting files can be generated automatically for an easy transfer to CNC machine tools.
Online Access
Free
Resource Link
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Connections for CLT Diaphragms in Steel-Frame Buildings

https://research.thinkwood.com/en/permalink/catalogue1594
Year of Publication
2014
Topic
Connections
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Hybrid Building Systems
Author
Joyce, Tom
Smith, Ian
Organization
NEWBuildS
Year of Publication
2014
Country of Publication
Canada
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Hybrid Building Systems
Topic
Connections
Mechanical Properties
Keywords
Steel
Connections
Self-Tapping Screws
Fabrication
Strength
Stiffness
Ductility
Language
English
Research Status
Complete
Summary
The high performance in-plane of cross laminated timber (CLT) panels has created a potential for the use of CLT members act as diaphragms in steel structures. The behaviour of this diaphragm system depends strongly on the connections involved in linking the panels together and to the steel members. A study of the connections at both locations was made using experimental testing of two connection designs for the panel-to-panel case, and the development of a staggered lag screw connection for the panel-to-steel beam case. The results showed good performance for the double spline and fully-threaded inclined screws panel-to-panel connections. The lag screw connection showed high strength, stiffness, and ductility. The CSA Standard O86-09 was found to best predict the strength of both types of connections. Characteristic design stiffness values were presented for the stiffness at low levels of displacement and the initial, elastic stiffness.
Online Access
Free
Resource Link
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Biomimicry as a Generator of Optimal Volumetrics in Wood

https://research.thinkwood.com/en/permalink/catalogue2195
Topic
Design and Systems
Organization
Université Laval
Country of Publication
Canada
Topic
Design and Systems
Keywords
Biomimicry
Environmental Adaptation
Digital Fabrication
Material efficiency
Research Status
In Progress
Notes
Project contact is André Potvin at Université Laval
Summary
The biomimetic approach in architecture explores the genius of organic natural forms resulting from a long process of environmental adaptation. These forms often have a high compactness and an optimal material / volume ratio in line with the importance of reducing the material in the building to limit its environmental impact in terms of energy and resources. What are the natural forms and processes of growth of the form most appropriate to the physical properties of wood? What design process promotes the integration of a biomimetic approach from the earliest stages of design? Based on a review of the main achievements claiming this approach, this project will develop a taxonomy of the different biomimetic typologies and identify the most promising in the context of a wood realization. A digital manufacturing process will be developed to reflect the complexity of natural shapes and flows in an organic architecture that optimizes environmental performance and aesthetics.
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Mass Timber, Small Format: Creative Applications of Fabrication Off-cuts

https://research.thinkwood.com/en/permalink/catalogue2798
Topic
Environmental Impact
Cost
Market and Adoption
Material
CLT (Cross-Laminated Timber)
MPP (Mass Plywood Panel)
Organization
TallWood Design Institute
University of Oregon
Country of Publication
United States
Material
CLT (Cross-Laminated Timber)
MPP (Mass Plywood Panel)
Topic
Environmental Impact
Cost
Market and Adoption
Keywords
Fabrication
Off-cuts
Cutouts
Furniture
Joinery
Open Source
Digital Design
Digital Fabrication
Research Status
In Progress
Notes
Project contacts are Linda Zimmer and Cory Olsen at the University of Oregon
Summary
During the testing and fabrication of mass timber projects a natural byproduct inevitably occurs in the form of offcuts and cutouts. In the case of new mass timber structures, the engineered wood materials are typically fabricated and prepared off site, allowing for the majority of the leftover materials to be made into useful products at the same facility already ideally set up for further digital fabrication. While the thickness of many of the spare panelized elements under investigation/production at TDI might seem excessive for smaller scale elements, the digital design and production techniques already being used allow for a fine degree of precision commensurate with furniture joinery. We propose to experiment with designing and fabricating furniture scale components and furniture prototypes as a way to reclaim these otherwise unused timber products. This project captures off cuts and remaindered materials from structural testing at TDI in both CLT and MPP panels. Our focus is the design and fabrication of freestanding furnishings (ex: stools, benches, tables, chairs) that will exploit the technologies available at the Emmerson Lab. We come at this with two perspectives: in the first, products could be made directly from the materials available; in the second, the output will act as a formwork or “jig” to facilitate construction of an entirely new prototype that could expand into additional material languages. In either case it is important to us to share digital files of prototypes as “open source” designs so that production facilities and design professionals can work together to reduce waste and/or use our designs as a springboard to customize their own pieces. In this way we address the stated program goals to expand and develop new products and building components and to foster markets for these. Our iterative approach to digital design and digital hybrids utilizes CNC/robotic fabrication and assembly and we will be testing our ideas in a design-build format.
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9 records – page 1 of 1.