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[1] Symons, D., Persaud, R. & Stanislaus, H., Slip modulus of inclined screws in timber–concrete floors. Proceedings of the Institution of Civil Engineers, Structures and Buildings 163 August 2010 Issue SB4, pp. 245–255, 2010.
[2] Kavaliauskas, S., Kvedaras, A.K. & Valiūnas, B., Mechanical behaviour of timber-to-concrete connections with inclined screws. Journal of Civil Engineering and Management, XIII(3), pp. 193–199, 2007.Figure 13: Slip modulus of inclined screws for timber–concrete composites at different angle inclinations, with and without gap.
[3] Tomasi, R., Crosatti, A. & Piazza, M., Theoretical and experimental analysis of timber-to-timber joints connected with inclined screws. Construction and Building Materials, 24, pp. 1560–1571, 2010. [Crossref]
[4] Fragiacomo, M. & Lukaszewska, E., Development of prefabricated timber-concrete composite floor systems. Structures and Buildings, 164(2), pp. 117–129, 2011. [Crossref]
[5] Bejtka, I. & Blaß, H.J., Joints with inclined screws. Proceedings from meeting thirty-five of the international council for building research studies and documentation, CIB, Working Commission W18 – Timber Structure, Kyoto, Japan, 2002.
[6] Bejtka, I. & Blaß, H.J., Screws with continuous threads in timber connections. RILEM, Proceedings PRO 22, Stuttgartl, 2001.
[7] Ceccotti, A., Fragiacomo, M. & Gutkowski, R.M., On the design of timber–concrete composite beams according to the new versions of Eurocode 5. 35th Meeting of the Working Commission W18–Timber Structures, International Council for Research and Innovation in Building and Construction, Kyoto, Japan, 2002, pp. 10–24.
[8] EN 1995-1-1, Eurocode 5: Design of timber structures - Part 1-1: General - Common rules and rules for buildings. CEN, 2004.
[9] UNI EN 26891, Timber structure – Joints made with mechanical fasteners – General principles for the determination of strength and deformation characteristic. CEN, 1991.
[10] BS EN 14358:2016, Timber structures – Calculation and verification of characteristic values. CEN, 2016.
[11] EN 13183-1, Moisture content of a piece of sawn timber – Determination by oven dry method. CEN, 2002.
[12] Hetényi, M., Beams on elastic foundation: theory with applications in the fields of civil and mechanical engineering. University of Michigan, 1971.
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Open Access
Research article

Mechanical Behavior of Timber–Concrete Connections with Inclined Screws

Beatrice Berardinucci,
Simona Di Nino,
Amedeo Gregori,
Massimo Fragiacomo*
Department of Civil, Architectural-Construction and Environmental Engineering, University of l’Aquila, Italy
International Journal of Computational Methods and Experimental Measurements
|
Volume 5, Issue 6, 2017
|
Pages 807-820
Received: N/A,
Revised: N/A,
Accepted: N/A,
Available online: 10-31-2017
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Abstract:

Timber–concrete composite structures are often used as floor solutions in new and existing buildings to combine better acoustic separation and improved thermal insulation with increased stiffness and greater load-carrying capacity. The choice of a structurally effective yet cheap shear connection between the concrete topping and the timber joist is crucial to make the composite floor a viable solution that can compete with reinforced concrete and steel structures. The use of inclined screws is a possible option to maximize the slip modulus of the connection and, at the same time, keep the construction cost within acceptable values. In this paper, the results from an experimental and numerical investigation carried out on such a type of shear connection are reported. Push-out tests were carried out at the Laboratory of the Department of Civil, Building and Environmental Engineering of the University of L’Aquila. Each specimen consisted of a timber block connected to two concrete slabs by means of two 8 mm diameter screws per side produced by Rotho Blaas. A layer of OSB was interposed to reproduce the timber flooring often used as permanent formwork for the placement of the concrete slab in new floors or the existing timber flooring when strengthening existing timber structures. Two different screw lengths and interlayer thicknesses were investigated. For each configuration, 10 push-out specimens were tested. The results were statistically assessed by computing the mean slip moduli and the characteristic values of the shear strength. Numerical simulations were also carried out to investigate the dependency of the slip modulus upon the screw inclination and the interlayer flooring thickness.

Keywords: connections, inclined screws, mechanical model, parametric analysis, Timber–concrete composite beams
References
[1] Symons, D., Persaud, R. & Stanislaus, H., Slip modulus of inclined screws in timber–concrete floors. Proceedings of the Institution of Civil Engineers, Structures and Buildings 163 August 2010 Issue SB4, pp. 245–255, 2010.
[2] Kavaliauskas, S., Kvedaras, A.K. & Valiūnas, B., Mechanical behaviour of timber-to-concrete connections with inclined screws. Journal of Civil Engineering and Management, XIII(3), pp. 193–199, 2007.Figure 13: Slip modulus of inclined screws for timber–concrete composites at different angle inclinations, with and without gap.
[3] Tomasi, R., Crosatti, A. & Piazza, M., Theoretical and experimental analysis of timber-to-timber joints connected with inclined screws. Construction and Building Materials, 24, pp. 1560–1571, 2010. [Crossref]
[4] Fragiacomo, M. & Lukaszewska, E., Development of prefabricated timber-concrete composite floor systems. Structures and Buildings, 164(2), pp. 117–129, 2011. [Crossref]
[5] Bejtka, I. & Blaß, H.J., Joints with inclined screws. Proceedings from meeting thirty-five of the international council for building research studies and documentation, CIB, Working Commission W18 – Timber Structure, Kyoto, Japan, 2002.
[6] Bejtka, I. & Blaß, H.J., Screws with continuous threads in timber connections. RILEM, Proceedings PRO 22, Stuttgartl, 2001.
[7] Ceccotti, A., Fragiacomo, M. & Gutkowski, R.M., On the design of timber–concrete composite beams according to the new versions of Eurocode 5. 35th Meeting of the Working Commission W18–Timber Structures, International Council for Research and Innovation in Building and Construction, Kyoto, Japan, 2002, pp. 10–24.
[8] EN 1995-1-1, Eurocode 5: Design of timber structures - Part 1-1: General - Common rules and rules for buildings. CEN, 2004.
[9] UNI EN 26891, Timber structure – Joints made with mechanical fasteners – General principles for the determination of strength and deformation characteristic. CEN, 1991.
[10] BS EN 14358:2016, Timber structures – Calculation and verification of characteristic values. CEN, 2016.
[11] EN 13183-1, Moisture content of a piece of sawn timber – Determination by oven dry method. CEN, 2002.
[12] Hetényi, M., Beams on elastic foundation: theory with applications in the fields of civil and mechanical engineering. University of Michigan, 1971.
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Berardinucci, B., Di Nino, S., Gregori, A., & Fragiacomo, M. (2017). Mechanical Behavior of Timber–Concrete Connections with Inclined Screws. Int. J. Comput. Methods Exp. Meas., 5(6), 807-820. https://doi.org/10.2495/CMEM-V5-N6-807-820
B. Berardinucci, S. Di Nino, A. Gregori, and M. Fragiacomo, "Mechanical Behavior of Timber–Concrete Connections with Inclined Screws," Int. J. Comput. Methods Exp. Meas., vol. 5, no. 6, pp. 807-820, 2017. https://doi.org/10.2495/CMEM-V5-N6-807-820
@research-article{Berardinucci2017MechanicalBO,
title={Mechanical Behavior of Timber–Concrete Connections with Inclined Screws},
author={Beatrice Berardinucci and Simona Di Nino and Amedeo Gregori and Massimo Fragiacomo},
journal={International Journal of Computational Methods and Experimental Measurements},
year={2017},
page={807-820},
doi={https://doi.org/10.2495/CMEM-V5-N6-807-820}
}
Beatrice Berardinucci, et al. "Mechanical Behavior of Timber–Concrete Connections with Inclined Screws." International Journal of Computational Methods and Experimental Measurements, v 5, pp 807-820. doi: https://doi.org/10.2495/CMEM-V5-N6-807-820
Beatrice Berardinucci, Simona Di Nino, Amedeo Gregori and Massimo Fragiacomo. "Mechanical Behavior of Timber–Concrete Connections with Inclined Screws." International Journal of Computational Methods and Experimental Measurements, 5, (2017): 807-820. doi: https://doi.org/10.2495/CMEM-V5-N6-807-820
BERARDINUCCI B， DI NINO S， GREGORI A， et al. Mechanical Behavior of Timber–Concrete Connections with Inclined Screws[J]. International Journal of Computational Methods and Experimental Measurements， 2017， 5(6)： 807-820. https://doi.org/10.2495/CMEM-V5-N6-807-820