Change search
ReferencesLink to record
Permanent link

Direct link
Development and Evaluation of Mechanical Joints for Composite Floor Elements with Cross Laminated Timber
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

One of the important issues in the development of a multi-storey timber construction system is the definition of the floor solution. This thesis focuses on the development of composite floor solutions where Cross Laminated Timber (CLT) panels are used as a base element. Preliminary investigations on shear connections between prefabricated concrete beams and CLT panels were performed. The focus is on investigations on glulam-CLT composite beamelements, and the mechanical shear connectors used to achieve composite action. The new shear connections system evaluated in this thesis for glulam-CLT floor elements consists of double-sided punched metal plate fasteners. In order to secure the shear connection made with double-sided nail plates and to improve the shear behaviour of the joint, a combination with inclined self-tapping screws was evaluated through a shear test programme.It was found that the double-sided punched metal plate fasteners and inclined screws can effectively be combined.Bending tests (6.4 m span) were carried out using double-sided nail plates as shear connectors, with and without combination with inclined screws. The double-sided nail plate connectors did behave satisfactorily in terms of strength and stiffness for the beam design considered, even when not combined with screws. It is however suggested that furtherresearch should be carried out before using double-sided nail plates as the sole shear connection in timber composite floor elements. It was found that, for the design and load case considered, the new shear connection system performs satisfactorily and could fulfil necessary design criteria. It is considered that the shear connection system may be suitable for floor spans up to 7 meters. Further research is necessary in order to assess the behaviour ofdouble-sided nail plates under long term loadings and, combined shear and separation forces. An analytical linear elastic model for the stiffness of inclined screw joints was derived. This model takes into account the dowel and withdrawal action of the screw as well as the friction between the timber members. The linear elastic model is general and allows prediction of theload-deformation behaviour of inclined screw joints in shear tension in the serviceability limit state for different angle inclinations. One of the advantages of this model is that different material properties and geometries can be used in each of the jointed members. The model is found to be appropriate for inclination angles between 30 and 60 degrees between the screw axis and the normal to the shear plane. Further material testing is necessary in order to obtain certain material parameters for this model.

Place, publisher, year, edition, pages
Luleå tekniska universitet, 2015.
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Research subject
Timber Structures
Identifiers
URN: urn:nbn:se:ltu:diva-17744Local ID: 4f83aef4-812a-4856-8926-8164a7d10306ISBN: 978-91-7583-307-1ISBN: 978-91-7583-308-8 (PDF)OAI: oai:DiVA.org:ltu-17744DiVA: diva2:990749
Note
Godkänd; 2015; 20150413 (nicjac)Available from: 2016-09-29 Created: 2016-09-29Bibliographically approved

Open Access in DiVA

fulltext(19181 kB)19 downloads
File information
File name FULLTEXT01.pdfFile size 19181 kBChecksum SHA-512
79136f6469daa4084a2983cf114d1ab1b9ab8cdcbb9fbfdb143c6ae11d704c8146e5557eaa0a6fc42e5350b00b8ba1571bd0a958751d9d46de2e27f2eee52f69
Type fulltextMimetype application/pdf
fulltext(211 kB)7 downloads
File information
File name FULLTEXT02.pdfFile size 211 kBChecksum SHA-512
b6f2d341e11e103b666d03c8678828905aa888e17af0decde36be86e5bfdc55ced72e9d1d5c3c96946a9e47cf7f9bc3f81ae89c67828b0ba4773ed29af6ca6b8
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Jacquier, Nicolas
By organisation
Structural and Construction Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 26 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 141 hits
ReferencesLink to record
Permanent link

Direct link