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Jacquier, Nicolas
Publications (8 of 8) Show all publications
Girhammar, U. A., Jacquier, N. & Källsner, B. (2017). Stiffness model for inclined screws in shear-tension mode in timber-to-timber joints. Engineering structures, 136, 580-595
Open this publication in new window or tab >>Stiffness model for inclined screws in shear-tension mode in timber-to-timber joints
2017 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 136, p. 580-595Article in journal (Refereed) Published
Abstract [en]

A stiffness model for inclined screws in timber joints, or as shear connectors in composite timber-to-timber members, is presented. Elastic conditions applicable to the initial or linearized part of the load-deformation response in the serviceability limit state are assumed. The model for the stiffness or slip modulus is general in nature; it includes both the dowel (or shearing) action and withdrawal action of the screw, the friction between the members and it takes into account possible dissimilar properties and geometries of the different parts of the joint configuration. The model is simplified in the sense that the screw is assumed rigid and the withdrawal stresses along the length of the screw are assumed evenly distributed. However, the effects of flexibility and extensibility of the screw are taken into account by applying a theoretically derived correction factor for the embedment and withdrawal stiffness modulus, respectively. The proposed model is illustrated showing the total stiffness versus the inclination, as well as the relative contributing effect from the shearing and withdrawal stiffness, respectively, the influence of the friction coefficient. Also, the effect of dissimilar properties and geometries between the two parts of the joint is illustrated. Experimental verification of the proposed model is also given. Comparisons with other stiffness models are also made.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-59974 (URN)10.1016/j.engstruct.2017.01.022 (DOI)000395611400042 ()2-s2.0-85012146296 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-02-14 (andbra)

Available from: 2016-10-26 Created: 2016-10-26 Last updated: 2018-09-13Bibliographically approved
Jacquier, N. (2015). Bending tests on glulam-CLT beams connected with double-sided punched metal plate fasteners and inclined screws (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Bending tests on glulam-CLT beams connected with double-sided punched metal plate fasteners and inclined screws
2015 (English)Report (Other academic)
Abstract [en]

This report presents bending tests performed on composite beams made from glulam beams and cross laminated timber (CLT) panels. The composite beam, with a T-cross section, represents a section of a floor element in a multi-storey CLT construction system. The shear connections used were made either of double-sided punched metal plate fasteners, either of inclined screws, or of a combination of both fastener types. The screws are used to secure the shear connection with double-sided nail plates with respect to possible separation forces between the glulam and the CLT. An additional test with a screw glued connection was made for comparison as the upper bound case in terms of composite action. The results show the beams with double-sided nail plates (with or without screws) achieved a very high level of composite action and an overall satisfactory behaviour. Almost full composite action was achieved for the screw-glued composite beam. A detailed design example of the beam element according to the Eurocode 5 and Finnish National Annex is presented.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2015. p. 64
Series
Technical report / Luleå University of Technology, ISSN 1402-1536
National Category
Building Technologies
Research subject
Timber Structures
Identifiers
urn:nbn:se:ltu:diva-23123 (URN)5ac0a46b-ede4-4af6-8ae0-4409b6241d5f (Local ID)978-91-7583-212-8 (ISBN)5ac0a46b-ede4-4af6-8ae0-4409b6241d5f (Archive number)5ac0a46b-ede4-4af6-8ae0-4409b6241d5f (OAI)
Projects
Modular industrialised cross laminated timber housing
Note
Godkänd; 2015; 20150119 (nicjac)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Jacquier, N. (2015). Development and Evaluation of Mechanical Joints for Composite Floor Elements with Cross Laminated Timber (ed.). (Doctoral dissertation). Paper presented at . : Luleå tekniska universitet
Open this publication in new window or tab >>Development and Evaluation of Mechanical Joints for Composite Floor Elements with Cross Laminated Timber
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
National Category
Building Technologies
Research subject
Timber Structures
Identifiers
urn:nbn:se:ltu:diva-17744 (URN)4f83aef4-812a-4856-8926-8164a7d10306 (Local ID)978-91-7583-307-1 (ISBN)978-91-7583-308-8 (ISBN)4f83aef4-812a-4856-8926-8164a7d10306 (Archive number)4f83aef4-812a-4856-8926-8164a7d10306 (OAI)
Note
Godkänd; 2015; 20150413 (nicjac)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Jacquier, N. & Girhammar, U. A. (2015). Evaluation of bending tests on composite glulam-CLT beams connected with double-sided punched metal plates and inclined screws (ed.). Paper presented at . Construction and Building Materials, 95, 762-773
Open this publication in new window or tab >>Evaluation of bending tests on composite glulam-CLT beams connected with double-sided punched metal plates and inclined screws
2015 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 95, p. 762-773Article in journal (Refereed) Published
Abstract [en]

Composite beam elements made of glulam beams and cross laminated timber (CLT) panels, and connected with a new shear connection system were tested under four point bending. The beams tested represent a section of a cassette floor element to be used in a multi-storey CLT construction system. The shear connection is primarily made of double-sided punched metal plate fasteners, connecting the CLT and glulam members to form a T-cross-section. Due to the uncertainty about the capacity of the double-sided nail plates to resist possible separation forces between the timber members, the shear connection may be secured with screws. Bending tests were performed with three shear connection configurations: double-sided punched metal plate fasteners only, inclined screws only, and double-sided punched metal plate fasteners combined with inclined screws. An additional test with a screw-glued connection was made for comparison. The results show that a shear connection with double-sided nail plates can be designed to provide a sufficiently high level of composite action and load-carrying capacity and represents an alternative shear connection system for glulam-CLT composite floors

National Category
Building Technologies
Research subject
Timber Structures
Identifiers
urn:nbn:se:ltu:diva-9576 (URN)10.1016/j.conbuildmat.2015.07.137 (DOI)000360417000076 ()2-s2.0-84938240593 (Scopus ID)83960462-6e30-466b-8c4b-996bca0730e6 (Local ID)83960462-6e30-466b-8c4b-996bca0730e6 (Archive number)83960462-6e30-466b-8c4b-996bca0730e6 (OAI)
Note
Validerad; 2015; Nivå 2; 20150811 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Jacquier, N. (2014). Shear tests on glulam-CLT joints with double-sided punched metal plate fasteners and inclined screws (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Shear tests on glulam-CLT joints with double-sided punched metal plate fasteners and inclined screws
2014 (English)Report (Other academic)
Abstract [en]

A new shear connection system was tested in order to be used in off-site manufactured cassette floor elements made with glulam beams and Cross Laminated Timber (CLT) panels. The shear connection proposed is made with double-sided punched metal plate fasteners, connecting CLT and glulam members to form a T-cross-section. Due to the lack of withdrawal capacity of punched metal plate fasteners, the shear connection must be secured with screws to resist separations forces which may occur between the members in the floor element. Shear tests were performed on glulam-CLT joints made with double-sided punched metal plate fasteners and with inclined self-tapping screws as reference cases to compare to joints with both fastener types combined. Each fastener type is characterised by a specific load-slip curve and different values for the yield slip, slip at maximum load and failure slip. These parameters can be used to evaluate the compatibility of the different fasteners and their combined effect in a joint. The test results show that there is a significant contribution from both the double-sided punched metal plate and inclined screw fasteners to the strength and stiffness of the combined joints.Due to the fact that the individual fasteners reach their maximum load for different slip values, the load-carrying capacity of joints with combined fasteners is somewhat lower than the sum of the individual fasteners load-carrying capacities. The slip modulus of the combined fasteners may be estimated as the sum of the respective slip modulus of each fastener due to the compatible behaviour of the fasteners in the serviceability limit state.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2014. p. 59
Series
Technical report / Luleå University of Technology, ISSN 1402-1536
National Category
Building Technologies
Research subject
Timber Structures
Identifiers
urn:nbn:se:ltu:diva-22073 (URN)1663b615-2574-4b04-bc3d-155c5961b1eb (Local ID)978-91-7439-892-2 (ISBN)978-91-7439-893-9 (ISBN)1663b615-2574-4b04-bc3d-155c5961b1eb (Archive number)1663b615-2574-4b04-bc3d-155c5961b1eb (OAI)
Note
Godkänd; 2014; 20140411 (nicjac)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Jacquier, N. & Girhammar, U. A. (2014). Tests on glulam–CLT shear connections with double-sided punched metal plate fasteners and inclined screws (ed.). Paper presented at . Construction and Building Materials, 72, 444-457
Open this publication in new window or tab >>Tests on glulam–CLT shear connections with double-sided punched metal plate fasteners and inclined screws
2014 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 72, p. 444-457Article in journal (Refereed) Published
Abstract [en]

A new shear connection system was tested in order to be used in off-site manufactured cassette floor elements made with glulam beams and cross laminated timber (CLT) panels. This type of floor element can present advantages from weight, structural and assembly point of view in multi-storey timber construction. The shear connection proposed is made of double-sided punched metal plate fasteners, connecting CLT and glulam members to form a T-cross-section. Inclined screws are used in combination with the double-sided nail plates to secure the shear connection. Shear test results are presented and compared with a simple calculation model for estimating the mean load-carrying capacity and stiffness of the combined joint according to methods available in the literature.

National Category
Building Technologies
Research subject
Timber Structures
Identifiers
urn:nbn:se:ltu:diva-14114 (URN)10.1016/j.conbuildmat.2014.08.095 (DOI)000345723500048 ()2-s2.0-84908291386 (Scopus ID)d6fe925f-e488-4427-a053-25724e63a963 (Local ID)d6fe925f-e488-4427-a053-25724e63a963 (Archive number)d6fe925f-e488-4427-a053-25724e63a963 (OAI)
Note
Validerad; 2014; 20141021 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Jacquier, N. & Girhammar, U. A. (2012). Tests on shear connections in prefabricated composite cross-laminated-timber and concrete elements (ed.). In: (Ed.), Pierre Quenneville (Ed.), World Conference on Timber Engineering: Final Papers - Architecture and Engineering Case Studies. Paper presented at World Conference on Timber Engineering : 15/07/2012 - 19/07/2012 (pp. 441-450). : New Zealand Timber Design Society
Open this publication in new window or tab >>Tests on shear connections in prefabricated composite cross-laminated-timber and concrete elements
2012 (English)In: World Conference on Timber Engineering: Final Papers - Architecture and Engineering Case Studies / [ed] Pierre Quenneville, New Zealand Timber Design Society , 2012, p. 441-450Conference paper, Published paper (Other academic)
Abstract [en]

The authors report on an experimental test program on different shear connectors to be used in floor elements where prefabricated concrete beams are to be connected on top of Cross-Laminated Timber (CLT) panels. The objective is to evaluate the level of composite action that can be achieved and the increase of strength and stiffness when combining effectively these structural components in a floor element. Shear tests were performed on 12 specimens in total. The shear connector consists of a steel plate as the common part to connect to both the concrete beam and the CLT panel. To the steel plate, studs or a metal mesh were welded and casted in the concrete beam to form a prefabricated unit. The CLT panel was then attached to the steel plate by screws. The main slip occurred between the CLT panel and the steel plate. The test results show a high ultimate load capacity for all types of shear connectors and a ductile type of behaviour for most of them. The test results for the shear connectors were compared with the capacity obtained from analytical models. Also, the strength and stiffness of partially composite floor elements with these shear connectors were analysed. It was found that from a structural point of view these shear connections are suitable to be used to form floor elements with a high level of composite action.

Place, publisher, year, edition, pages
New Zealand Timber Design Society, 2012
National Category
Building Technologies
Research subject
Timber Structures
Identifiers
urn:nbn:se:ltu:diva-31872 (URN)62f5db51-c71a-4728-a71b-10e1d832ccea (Local ID)9781622763054 (ISBN)62f5db51-c71a-4728-a71b-10e1d832ccea (Archive number)62f5db51-c71a-4728-a71b-10e1d832ccea (OAI)
Conference
World Conference on Timber Engineering : 15/07/2012 - 19/07/2012
Note
Godkänd; 2012; 20121205 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Stehn, L., Girhammar, U. A., Jacquier, N., Manninen, J. & Brännström, M. (2010). Project: Modular industrialised cross laminated timber housing. Paper presented at .
Open this publication in new window or tab >>Project: Modular industrialised cross laminated timber housing
Show others...
2010 (English)Other (Other (popular science, discussion, etc.))
Abstract [en]

Syfte  The project aim is to present structural detail design solutions of a cross laminated timber (CLT) building system incorporating structural and process efficiency, i.e., an industrial structural system design and verification. The work includes participation in pre-design, pilot project experience feedback optimization of an adapted production method (volume and/or element) by computer/laboratory testing of selected structural components and joints.

National Category
Building Technologies
Research subject
Timber Structures
Identifiers
urn:nbn:se:ltu:diva-36249 (URN)c5f16ab6-99b4-4279-b937-653ed68dab08 (Local ID)c5f16ab6-99b4-4279-b937-653ed68dab08 (Archive number)c5f16ab6-99b4-4279-b937-653ed68dab08 (OAI)
Note

Projekt: Lean Wood Engineering; Publikationer: Bending tests on glulam-CLT beams connected with double-sided punched metal plate fasteners and inclined screws; Status: Ongoing; Period: 17/12/2010 → …

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
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