Innovative Timber-Concrete Composite Structures with Prefabricated FRC Slabs
Publication: Journal of Structural Engineering
Volume 141, Issue 9
Abstract
This paper concerns the development of innovative composite floor systems, comprising timber beams and prefabricated concrete slabs. For the development of this new system, two properties were regarded as vital, as follows: (1) good stiffness, and (2) a high degree of prefabrication. Shear connection systems installed using completely dry processes were used. Innovative and very efficient materials, such as fiber-reinforced concrete (FRC) and modified wood, were used for the manufacture of the specimens. The research reported in this paper was conducted in two phases, as follows: (1) the mechanical properties of different shear connectors were investigated (Phase A), and (2) on the basis of these experiment’s results a second investigation was carried out in order to study the behavior of full-scale timber-concrete composite slabs (Phase B). During Phase A four different configurations, with a total of eight specimens, were laboratory tested in shear. During Phase B two full-scale floor elements, each with a different shear connection system, were laboratory tested in bending. The two shear connector systems used in the investigation were (1) shear anchor-keys of furfurylated wood, and (2) inclined steel tubes. Both of the proposed connection systems performed more than satisfactorily, showing a very high degree of composite action even at load levels close to the failure load. Moreover, it appeared that the assembling of the prefabricated fiber-reinforced concrete slab with the underlying beams occurred in an extremely easy manner.
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Acknowledgments
The writers gratefully acknowledge the financial support for the research reported in this paper granted by the Lars Erik Lundberg Scholarship Foundation and by SP, Technical Research Institute of Sweden, Building and Mechanics Division, Borås, Sweden. The timber material was supplied by Moelven Töreboda, the glulam mill, Töreboda, Sweden, and the screws by the Rotho Blaas Company, Cortaccia, Italy. The writers are grateful to both companies.
References
Bathon, L., Bletz, O., and Bahmer, R. (2006). “Concrete bearings—A new design approach in wood-concrete-composite applications.” Proc., 10th World Conf. on Timber Engineering, Portland, OR.
Ceccotti, A. (1995). “Timber-concrete composite structures.” Timber engineering—Step 2, Centrum Hout, Almere-Buiten, Netherlands, E13/1–E13/12.
Collin, P., Stoltz, A., and Möller, M. (2002). “Innovative prefabricated composite bridges.” Proc., Int. Association for Bridge and Structural Engineering (IABSE) Symp. Rep., Zurich, Switzerland.
Crocetti, R., Sartori, T., and Flansbjer, M. (2010). “Timber-concrete composite structures with prefabricated FRC slab.” Proc., World Conf. on Timber Engineering, Portland, OR.
European Committee for Standardization (CEN). (1991). “Timber structures—Joints made with mechanical fasteners—General principles for the determination of strength and deformation characteristic.”, Brussels, Belgium.
European Committee for Standardization (CEN). (2013). “Timber structures—Glued laminated timber and glued solid timber—Requirements.”, Brussels, Belgium.
European Committee for Standardization (CEN). (2014). “Design of timber structures—Part 1-1: General—Common rules and rules for buildings.”, Brussels, Belgium.
European Technical Approval (ETA). (2012). “Self-tapping screws for use in timber structures.”, Charlottenlund.
Fragiacomo, M., and Lukaszewska, E. (2011). “Development of prefabricated timber-concrete composite floor systems.” Struct. Build., 164(2), 117–129.
Gutkowski, R., Brown, K., Shigidi, A., and Natterer, J. (2008). “Laboratory tests of composite wood–concrete beams.” Constr. Build. Mater., 22(6), 1059–1066.
Jutila, A., and Salokangas, L. (2010). “Wood-concrete composite bridges—Finnish speciality in the Nordic countries.” Proc., Int. Conf. on Timber Bridges.
Lande, S. (2008). “Furfurylation of wood—Wood modification by the use of furfuryl alcohol.” Ph.D. thesis, Dept. of Ecology and Natural Resource Management, Norwegian Univ. of Life Science, Ås, Norway.
Lukaszewska, E. (2009). “Development of prefabricated timber-concrete composite floors.” Ph.D. thesis, Div. of Structural Engineering, Dept. of Civil, Mining, and Environmental Engineering, Luleå Univ. of Technology, Luleå, Sweden.
Lukaszewska, E., Johnsson, H., and Sthen, L. (2006). “Connections for prefabricated timber-concrete composite systems.” Proc., World Conf. on Timber Engineering.
Möhler, K. (1956). “On the load carrying behavior of beams and columns of compound sections with flexible connections.” Ph.D. thesis, Technical Univ. of Karlsruhe, Karlsruhe, Germany.
Nakamura, S., and Collin, P. (2009). “Steel concrete composite structures: Introduction.” Struct. Eng. Int., 19(4), 395–395.
Natterer, J., and Weinand, Y. (2008). “Modelling of multi-layer beam with inter-layer slips.” Proc., 10th World Conf. on Timber Engineering, Miyazaki, Japan.
Parisi, M., and Piazza, M. (2007). “Restoration and strengthening of timber structures: Principles, criteria, and examples.” Pract. Period. Struct. Des. Constr., 12(4), 177–185.
Riggio, M., Tomasi, R., and Piazza, M. (2014). “Refurbishment of a traditional timber floor with a reversible technique: Importance of the investigation campaign for design and control of the intervention.” Int. J. Archit. Heritage, 8(1), 74–93.
SAP 2000 [Computer software]. Berkeley, CA, Computers and Structures.
Shah, S. P., and Rangan, B. V. (1971). “Fiber reinforced concrete properties.” ACI J., 68(2), 126–135.
Sjöström, A., Montero, J. N., Bard, D., and Crocetti, R. (2012). “Vibratory investigation of a fiber reinforced concrete floor supported by wooden beams: Part I.” Proc., Joint Baltic-Nordic Acoustics Meeting.
Tomasi, R., Crosatti, A., and Piazza, M. (2010). “Theoretical and experimental analysis of timber-to-timber joints connected with inclined screws.” Constr. Build. Mater., 24(9), 1560–1571.
Treu, A., Pilgård, A., Puttmann, S., Krause, A., and Westin, M. (2009). “Material properties of furfurylated wood for window production.” Proc., Int. Research Group on Wood Protection Annual Meeting, Beijing.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 9 • September 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 4, 2013
Accepted: Jan 23, 2014
Published online: Nov 6, 2014
Discussion open until: Apr 6, 2015
Published in print: Sep 1, 2015
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