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Micro-notches as a novel connection system for timber-concrete composite slabs

https://research.thinkwood.com/en/permalink/catalogue2841
Year of Publication
2021
Topic
Connections
Mechanical Properties
Design and Systems
Material
DLT (Dowel Laminated Timber)
Timber-Concrete Composite
Application
Floors
Author
Müller, Katharina
Frangi, Andrea
Organization
ETH Zurich
Publisher
Elsevier
Year of Publication
2021
Format
Journal Article
Material
DLT (Dowel Laminated Timber)
Timber-Concrete Composite
Application
Floors
Topic
Connections
Mechanical Properties
Design and Systems
Keywords
Connection Systems
Experimental Investigations
Sustainable Construction
Micro-notches
Research Status
Complete
Series
Engineering Structures
Summary
Timber-concrete composite slabs are more and more in use: the combination of timber and concrete combines the advantages of both materials and offer a valid solution for the increasing demand for sustainable construction. The connection between timber and concrete is the crucial element, yet its potential regarding material and time expenses is not exploited. This paper presents the novel connection system micro-notches, an interlocking concept between timber and concrete with indentations in the millimetre range. Micro-notches provide a continuous shear transfer without additional steel fasteners such as screws or dowels. The paper presents the development of the micro-notch concept in an extensive experimental program supplemented with analytical and numerical models, a calculation model, and practice-relevant guidelines. The results of the investigations show that micro-notches feature an approximately rigid composite action between timber and concrete and a sufficient shear strength for the use in office and residential buildings.
Online Access
Free
Resource Link
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Self-camber of timber beams by swelling hardwood inlays for timber–concrete composite elements

https://research.thinkwood.com/en/permalink/catalogue2950
Year of Publication
2021
Topic
Mechanical Properties
Moisture
Material
Timber-Concrete Composite
Application
Beams
Author
Müller, Katharina
Grönquist, Philippe
Cao, Alex
Frangi, Andrea
Organization
ETH Zurich
Publisher
Elsevier
Year of Publication
2021
Format
Journal Article
Material
Timber-Concrete Composite
Application
Beams
Topic
Mechanical Properties
Moisture
Keywords
Self-Camber
Swelling
Serviceability Limit State
European Beech
Research Status
Complete
Series
Construction and Building Materials
Summary
Timber–concrete composites (TCC) are smart solutions for slabs in residential and office buildings regarding the sustainable and performance-optimized use of materials. However, a non-negligible disadvantage is the deflection of the timber elements caused by in-situ concrete casting during construction. This paper presents an approach to camber timber elements without external forces by using the innate swelling capacity of wood. Oven-dried hardwood inlays can be inserted transversally into cuts on the top side of a timber element. After an increase of the moisture content in the inlays, the swelling pressure will result in a self-camber of the timber element. In this study, a procedure for prediction of the self-camber is derived and the model is validated using an experimental test series. The results demonstrate that the self-camber of spruce elements using beech inlays is both feasible and predictable. On this basis, practical application scenarios for TCC elements in timber engineering are shown and discussed.
Online Access
Free
Resource Link
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