Experimental and Analytical Investigations of a Timber–Concrete Composite Beam Using a Hardwood Interface Layer
Publication: Journal of Structural Engineering
Volume 145, Issue 7
Abstract
This paper presents a study that examined the use of a new connection system in a prefabricated timber–concrete composite (TCC) beam in which a hardwood layer was glued to the top of a timber web to reinforce a dowel-type connection. Embedment tests highlighted the mechanical advantages associated with the use of Eucalyptus sideroxylon, which had a mean density of . The slip modulus of the proposed connection determined from double shear tests outperformed a prefabricated connection involving dowel connectors and no hardwood layer by 75%. Full-scale testing was undertaken on six beams, with two configurations of shear connectors studied. For each beam, the load-deflection behavior, relative slip between the concrete and timber at each connector, and strain profile at the midspan were measured. A simulation model was developed from which a parametric analysis was undertaken. Composite action of 81.9% was achieved when the minimum spacing was used. Using the -method as a design guideline is recommended. This connection system avoided the additional labor associated with using notches or adhesive at the interface and was easily fabricated.
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Acknowledgments
Sincere gratitude is expressed to Mr. Mark Byrami and Mr. Ross Reichardt from the materials laboratory, The University of Auckland, for their help in fabricating and testing the full-scale beams. The authors would like to thank The University of Auckland undergraduate students who did the shear test as their final-year project. In addition, the authors are grateful to Nelson Pine Industries Limited for supplying the LVL material at reduced cost and Momentive Specialty Chemicals Limited for donating the adhesive.
References
ASTM. 2007. Standard test method for evaluating dowel-bearing strength of wood and wood-based products. ASTM D5764-97a. West Conshohocken, PA: ASTM.
ASTM. 2011. Standard practice for sampling and data-analysis for structural wood and wood-based products. ASTM D2915. West Conshohocken, PA: ASTM.
Bathon, L. A., and P. Clouston. 2004. “Experimental and numerical results on semi pre-stressed wood-concrete composite floor systems for long span applications.” In Proc., 8th World Conf. on Timber Engineering, 339–344. Lathi, Finland: Finnish Association of Civil Engineers, RIL.
Ceccotti, A. 1995. “Timber–concrete composite structures.” In Timber engineering, Step 2, E13/1–E13/12. Almere, Netherlands: Centrum Hout.
Ceccotti, A. 2002. “Composite concrete-timber structures.” Prog. Struct. Eng. Mater. 4 (3): 264–275.
Ceccotti, A., R. Fellow, M. Fragiacomo, and S. Giordano. 2007. “Long-term and collapse tests on a timber-concrete composite beam with glued-in connection.” Mater. Struct. J. 40 (1): 15–25. https://doi.org/10.1617/s11527-006-9094-z.
CEN (Comité Européen de Normalisation). 1991. Timber structures: Joints made with mechanical fasteners: General principles for the determination of strength and deformation characteristics. EN 26891. Brussels, Belgium: CEN.
CEN (Comité Européen de Normalisation). 2004. Design of timber structures: General—Common rules and rules for buildings. Eurocode 5. Brussels, Belgium: CEN.
CEN (Comité Européen de Normalisation). 2010. Timber structures. Structural timber and glued laminated timber: Determination of some physical and mechanical properties. EN408. Brussels, Belgium: CEN.
Clouston, P., L. A. Bathon, and A. Schreyer. 2005. “Shear and bending performance of a novel wood-concrete composite system.” J. Struct. Eng. 131 (9): 1404–1412. https://doi.org/10.1061/(ASCE)0733-9445(2005)131:9(1404).
Deam, B. L., M. Fragiacomo, and A. H. Buchanan. 2008. “Connections for composite concrete slab and LVL flooring systems.” Mater. Struct. 41 (3): 495–507. https://doi.org/10.1617/s11527-007-9261-x.
Dias, A., J. Skinner, K. Crews, and T. Tannert. 2016. “Timber-concrete-composites increasing the use of timber in construction.” Eur. J. Wood Wood Prod. 74 (3): 443–451. https://doi.org/10.1007/s00107-015-0975-0.
Fragiacomo, M., and E. Lukaszewska. 2011. “Development of prefabricated timber–concrete composite floor systems.” Proc., Inst. Civ. Eng. Struct. Build. 164 (2): 117–129. https://doi.org/10.1680/stbu.10.00010.
Fragiacomo, M., and E. Lukaszewska. 2013. “Time-dependent behaviour of timber-concrete composite floors with prefabricated concrete slabs.” Eng. Struct. 52: 687–696. https://doi.org/10.1016/j.engstruct.2013.03.031.
Gerber, C., K. Crews, M. Foscoliano, and S. Agus. 2010. “Development of timber concrete composite flooring in Australia and New Zealand.” In Proc., 11th World Conf. on Timber Engineering (WCTE), 139–146. Trentino, Italy: Curran Associates, Inc.
Gutkowski, R., K. Brown, A. Shigidi, and J. Natterer. 2008. “Laboratory tests of composite wood-concrete beams.” Constr. Build. Mater. 22 (6): 1059–1066. https://doi.org/10.1016/j.conbuildmat.2007.03.013.
Lukaszewska, E., M. Fragiacomo, and H. Johnsson. 2010. “Laboratory tests and numerical analyses of prefabricated timber-concrete composite floors.” J. Struct. Eng. 136 (1): 46–55. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000080.
Momentive. 2007. SYLVIC R15/SYLVIC RP50/RP51 (technical data sheet). Tauranga, New Zealand: Hexion NZ.
Monteiro, S. R. S., A. M. P. G. Dias, and S. M. R. Lopes. 2015. “Bi-dimensional numerical modeling of timber-concrete slab-type structures.” Mater. Struct. 48 (10): 3391–3406. https://doi.org/10.1617/s11527-014-0407-3.
Natterer, J. K. 2002. “New technologies for engineered timber structures.” Prog. Struct. Eng. Mater. 4 (3): 245–263. https://doi.org/10.1002/pse.119.
Negrão, J., F. Maia de Oliveira, C. Leitão de Oliveira, and P. Cachim. 2010. “Glued composite timber-concrete beams. I: Interlayer connection specimen tests.” J. Struct. Eng. 136 (10): 1246–1254. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000251.
Nelson Pine Industries Limited. 2012. Specific engineering design guide. Richmond, New Zealand: Nelson Pine Industries Limited.
Persaud, R., and D. Symons. 2006. “Design and testing of a composite timber and concrete floor system.” Struct. Eng. 84 (4): 22–30.
Raftery, G. M., and P. D. Rodd. 2015. “FRP reinforcement of low-grade glulam timber bonded with wood adhesive.” Constr. Build. Mater. 91: 116–125. https://doi.org/10.1016/j.conbuildmat.2015.05.026.
Santos, P. G. G. D., C. E. D. J. Martins, J. Skinner, R. Harris, A. M. P. G. Dias, and L. M. C. Godinho. 2015. “Modal frequencies of a reinforced timber-concrete composite floor: Testing and modeling.” J. Struct. Eng. 141 (11): 04015029. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001275.
SA/SNZ (Standards Australia/Standards New Zealand). 2002. Structural design actions. Part 1: Permanent, imposed and other actions. AS/NZS 1170.1. Wellington, New Zealand: SA/SNZ.
SA/SNZ (Standards Australia/Standards New Zealand). 2010. Characterization of structural timber. Part 1: Test methods. AS/NZS 4063.1. Sydney, Australia: SA/SNZ.
SA (Standards Australia). 1996. Coach screws: Metric series with ISO hexagon heads. AS/NZS1393. Sydney, Australia: SA.
SA (Standards Australia). 2006. Timber structures Part 2: Timber properties. AS 1720.2. Sydney, Australia: SA.
Seyb, K. 2010. Timber-concrete composite flooring: Stiffness of connections. Auckland, New Zealand: Dept. of Civil and Environmental Engineering, Univ. of Auckland.
SNZ (Standards New Zealand). 1986. Methods of test for concrete. Part 2: Tests related to the determination of strength of concrete. NZS 3112.2. Wellington, New Zealand: SNZ.
SNZ (Standards New Zealand). 1993. Timber structures standard. NZS 3603. Wellington, New Zealand: SA/SNZ.
Steinberg, E., R. Selle, and T. Faust. 2003. “Connectors for timber-lightweight concrete composite structures.” J. Struct. Eng. 129 (11): 1538–1545. https://doi.org/10.1061/(ASCE)0733-9445(2003)129:11(1538).
Symons, D., R. Persaud, and H. Stanislaus. 2010. “Strength of inclined screw shear connections for timber and concrete composite construction.” Struct. Eng. 88 (1): 25–32.
Van der Linden, M. L. R. 1999. “Timber-concrete composite beams.” Heron 44 (3): 215–239.
Yeoh, D. 2010. “Timber-concrete composite floor system.” Ph.D. thesis, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury.
Yeoh, D., M. Fragiacomo, A. Buchanan, and C. Gerber. 2009. “Preliminary research towards a semi-prefabricated LVL-concrete composite floor system for the Australasian market.” Aust. J. Struct. Eng. 9 (3): 225–240. https://doi.org/10.1080/13287982.2009.11465025.
Yeoh, D., M. Fragiacomo, and B. Deam. 2011a. “Experimental behaviour of LVL-concrete composite floor beams at strength limit state.” Eng. Struct. 33 (9): 2697–2707. https://doi.org/10.1016/j.engstruct.2011.05.021.
Yeoh, D., M. Fragiacomo, M. De Franceschi, and H. B. Koh. 2011b. “State of the art on timber-concrete composite structures: Literature review.” J. Struct. Eng. 137 (10): 1085–1095. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000353.
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©2019 American Society of Civil Engineers.
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Received: Feb 19, 2018
Accepted: Nov 15, 2018
Published online: Apr 26, 2019
Published in print: Jul 1, 2019
Discussion open until: Sep 26, 2019
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