Interlayer Influence on Timber-LWAC Composite Structures with Screw Connections
Publication: Journal of Structural Engineering
Volume 137, Issue 5
Abstract
Timber-concrete composite structures are often used as upgrade solutions for existent timber floors. The timber cross section is maintained and a concrete layer is poured over the floorboard surface. Floorboards help with loading distribution on the beams. The study presented is based on laboratory tests that used specimens made with a lightweight aggregate concrete (LWAC). The use of this type of concrete, compared with normal weight concrete (NWC), has the advantage of lower dead weights, and might be very important in many cases, namely, when the supporting structure has limited strength. Many design works of timber-concrete composite connections do not take into account the timber interlayer, which is known to reduce the load-carrying capacity and the stiffness of the connection. Previous investigations of NWC found that the inclusion of the interlayer leads to average reductions of 30% and 50% for the load capacity and slip modulus, respectively. The current investigation with LWAC found that such reductions are up to 10 and 30%, respectively.
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References
Bernardo, L. F. A., and Lopes, S. M. R. (2004). “Neutral axis depth versus flexural ductility in high strength concrete beams.” J. Struct. Eng., 130(3), 452–459.
Bernardo, L. F. A., and Lopes, S. M. R. (2009). “Plastic analysis of HSC beams in flexure.” Mater. Struct., 42(1), 51–69.
Carmo, R. N. F., and Lopes, S. M. R. (2005). “Ductility and linear analysis with moment redistribution in reinforced high strength concrete beams.” Can. J. Civ. Eng., 32(1), 194–203.
Carmo, R. N. F., and Lopes, S. M. R. (2006). “Required plastic rotation of RC beams.” Proc. Inst. Civ. Eng. Struct. Build., 159(SB2), 77–86.
Carmo, R. N. F., and Lopes, S. M. R. (2008). “Available plastic rotation in continuous high-strength concrete beams.” Can. J. Civ. Eng., 35(10), 1152–1162.
Deutsches Institut für Bautechnik. (2003). “SFS Holz-Beton-Verbundsystem (Z-9.1-342)” (in German).
Dias, A. M. P. G., Lopes, S., van de Kuilen, J. W., and Cruz, H. (2007). “Load carrying capacity of timber-concrete joints with dowel type fasteners.” J. Struct. Eng., 133(5), 720–727.
European Committee for Standardization (CEN). (1994). “Timber structures—Joints made with mechanical fasteners—General principles for determination of strength and deformation characteristics.” EN 26891, Brussels.
European Committee for Standardization (CEN). (2004). “Design of timber structures. Part 1-1: General—Common rules and rules for buildings.” EN 1995—Eurocode 5, Brussels.
Fragiacomo, M. (2006). “Long-term behavior of timber—Concrete composite beams. II: Numerical analysis and simplified evaluation.” J. Struct. Eng., 132(1), 23–33.
Fragiacomo, M., and Ceccotti, A. (2006). “Long-term behavior of timber—Concrete composite beams. I: Finite element modeling and validation.” J. Struct. Eng., 132(1), 13–22.
Girhammar, U., and Gopu, V. (1991). “Analysis of - effect in composite concrete/timber beams columns.” Proc. Inst. Civ. Eng., 91(1), 39–54.
Lopes, S. M. R., and Bernardo, L. F. A. (2003). “Plastic rotation capacity of high-strength concrete beams.” Mater. Struct., 36(255), 22–31.
Möhler, K. (1956). Uber das Tragverhalten von Biegeträgern und Druckstäben mit zusammengestezten Querschnitten und nachgiebigen Verbindungsmitteln, Habilitation. Technical University of Karlsruhe: I-II, Karlsruhe, Germany, 1–73.
Newmark, N., Siess, C., and Viest, I. (1951). “Test and analysis of composite beams with incomplete interaction.” Proc. Soc. Exp. Stress Anal., 9(1), 75–92.
Steinberg, E., Selle, R., and Faust, T. (2003). “Connectors for timber—Lightweight concrete composite structures.” J. Struct. Eng., 129(11), 1538–1545.
van der Linden, M. (1999). “Timber-concrete composite floor systems.” Ph.D. thesis, Delft University Press, Delft, Holland.
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© 2011 American Society of Civil Engineers.
History
Received: Aug 24, 2009
Accepted: Aug 20, 2010
Published online: Aug 25, 2010
Published in print: May 1, 2011
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