Influence of Repeated and Sustained Loading on the Performance of Layered Wood–Concrete Composite Beams
Publication: Journal of Structural Engineering
Volume 134, Issue 3
Abstract
The paper investigates the influence of cyclic and sustained loading on the performance of layered wood–concrete composite beams interconnected by a notched connection detail. A number of composite beams were conditioned in a climate chamber in order to raise the wood moisture content from the ambient value (5–7%) to about 12%. Then the beams were subjected to of loading and unloading to simulate the typical live load frequency experienced by the floor of a commercial building over a service life. Finally, each individual beam was ramp loaded to failure to determine the ultimate load carrying capacity and composite efficiency. Additional beams were subjected to sustained load for in an unconditioned environment and then tested to failure. The main outcomes of the experimental program were: (1) relatively high beam stiffness and strength were achieved despite the use of few connectors; (2) two types of failure mechanisms were detected: either shear in the wood between the exterior notch and the beam end, or wood bending failure at midspan; (3) the cyclic loading increased the initial elastic deflection by 18% and reduced the beam stiffness by 9%, on average; (4) after of sustained load, the deflection increased by 59%, on average; and (5) the reduction in stiffness and in load capacity due to sustained loading was greater than that due to the cyclic loading.
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Acknowledgments
The Borden Chemical Inc., company provided a needed supply of its adhesive. The writers graciously acknowledge the initial support for the project granted by the U.S. Department of Agriculture (Grant No. 9503803) as related to floor construction. The U.S. Department of Transportation provided support for later studies related to possible application in bridges. That funding was via the Mountain Plains Consortium, which is federally sponsored through the University Transportation Centers Program. The contents reflect the views of the writers only, and the above-mentioned agencies assume no liability for the contents or use thereof.
References
Ahmadi, B. H., and Saka, M. P. (1993). “Behavior of composite timber-concrete floors.” J. Struct. Eng., 119(11), 3111–3130.
American Concrete Institute. (2002). “Building code requirements for structural concrete and Commentary.” ACI 318-02 and ACI 318R-02 Farmington Hills, Mich.
American Forest and Paper Association. (2005). “National design specification for wood construction.” ANSI/AF&PA NDS-2005, AF&PA American Wood Council, Washington, D.C.
American Society for Testing and Materials (ASTM). (1993). “Standard test methods for mechanical properties of lumber and wood-based structural material.” ASTM Standard D4761-93, Philadelphia.
American Society for Testing and Materials (ASTM). (2002). “Standard test method for compressive strength of cylindrical concrete specimens.” ASTM C 39/C 39M-01, Vol. 04.02, ASTM International, West Conshohocken, Pa., 21–25.
Bathon, L., and Graf, M. (2000). “A continuous wood-concrete-composite system.” Proc., 6th World Conf. on Timber Engineering WCTE 2000 (CD-ROM), Whistler Resort, B.C., Canada.
Brunner, M., and Schnuriger, M. (2006). “Adhesive connection for timber-concrete composite.” Proc., 9th World Conf. on Timber Engineering WCTE 2006 (CD-ROM), Portland, Ore.
Ceccotti, A. (1995). “Timber-concrete composite structures.” Timber engineering, step 2, 1st Ed., Centrum Hout, Almere, The Netherlands, E13/1–E13/12.
Ceccotti, A., Fragiacomo, M., and Giordano, S. (2007). “Long-term and collapse tests on a timber-concrete composite beam with glued-in connection.” Mater. Struct., 40(1), 15–25.
Clouston, P., Bathon, L. A., and Schreyer, A. (2005). “Shear and bending performance of a novel wood–concrete composite system.” J. Struct. Eng., 131(9), 1404–1412.
Deam, B. L., Fragiacomo, M., and Buchanan, A. H. (2007). “Connections for composite concrete slab and LVL flooring systems.” Mater. Struct., published online.
Dias, A. M. P. G., Lopes, S. M. R., Van de Kuilen, J. W. G., and Cruz, H. M. P. (2007). “Load-carrying capacity of timber-concrete joints with dowel-type fasteners.” J. Struct. Eng., 133(5), 720–727.
Dias, A. M. P. G., Van de Kuilen, J. W. G., Cruz, H. M. P., and Lopes, S. M. R. (2006). “Densified veneer wood for notched joints in timber concrete composite structures.” Proc., 9th World Conf. on Timber Engineering WCTE 2006 (CD-ROM), Portland, Ore.
Döhrer, A., and Rautenstrauch, K. (2006). “Connectors for timber-concrete composite-bridges.” Proc., Meeting 39 of the Working Commission W18-Timber Structures, CIB, Int. Council for Research and Inn., Florence, Italy, paper CIB-W18/39-7-3.
Fast, R. S., Gutkowski, R. M., Criswell, M. E., and Radford, D. W. (2003). “Durability studies of layered wood-concrete connections and beams.” Structural Research Rep. No. 84, Dept. of Civil Engineering, Colorado State Univ., Fort Collins, Colo.
Forest Products Laboratory. (1999). “Wood handbook—Wood as an engineering material.” General Technical Rep. No. FPL-GTR-113, Forest Products Laboratory, Dept. of Agriculture, Forest Service, Madison, Wis.
Fragiacomo, M., Amadio, C., and Macorini, L. (2007). “Short- and long-term performance of the Tecnaria stud connector for timber-concrete composite beams.” Mater. Struct., 40(10), 1013–1026.
Fragiacomo, M., Gutkowski, R. M., Balogh, J., and Fast, R. S. (2007). “Long-term behavior of wood-concrete composite floor/deck systems with shear key connection detail.” J. Struct. Eng., 133(9), 1307–1315.
Gelfi, P., Giuriani, E., and Marini, A. (2002). “Stud shear connection design for composite concrete slab and wood beams.” J. Struct. Eng., 128(12), 1544–1550.
Grantham, R., Enjily, V., Fragiacomo, M., Nogarol, C., Zidaric, I., and Amadio, C. (2004). “Potential upgrade of timber frame buildings in the UK using timber-concrete composites.” Proc., 8th World Conf. on Timber Engineering WCTE 2004, Vol. 2, Lahti, Finland, 59–64.
Gutkowski, R. M., Brown, K., Shigidi, A., and Natterer, J. (2004). “Investigation of notched composite wood-concrete connections.” J. Struct. Eng., 130(10), 1553–1561.
Gutkowski, R. M., Brown, K., Shigidi, A., and Natterer, J. (2007). “Laboratory tests of composite wood-concrete beams.” Constr. Build. Mater., published online.
Gutkowski, R. M., Fast, R. S., Balogh, J., and Fragiacomo, M. (2006). “Time-dependent load performance of notched wood-concrete composite beams.” Proc., Structural -2006 Conf., Edinburgh, Scotland, U.K.
Jorge, L., Lopes, S., and Cruz, H. (2006). “Castellated surface for timber-concrete composite connections.” Proc., 9th World Conf. on Timber Engineering WCTE 2006 (CD-ROM), Portland, Ore.
Kuhlmann, U., and Michelfelder, B. (2006). “Optimized design of grooves in timber-concrete composite slabs.” Proc., 9th World Conf. on Timber Engineering WCTE 2006 (CD-ROM), Portland, Ore.
Lukaszewska, E., Johnsson, H., and Fragiacomo, M. (2007). “Performance of connections for prefabricated timber-concrete composite floors.” Mater. Struct., in press.
Natterer, J., Hamm, J., and Favre, P. (1996). “Composite wood-concrete floors for multi-story buildings.” Proc., Int. Wood Engineering Conf., New Orleans, 3431–3435.
Negrão, J. H., Oliveira, F. M., and Oliveira, C. L. (2006). “Investigation on timber-concrete glued composites.” Proc., 9th World Conf. on Timber Engineering WCTE 2006 (CD-ROM), Portland, Ore.
Piazza, M., and Ballerini, M. (2000). “Experimental and numerical results on timber-concrete composite floors with different connection systems.” Proc., 6th World Conf. on Timber Engineering (CD-ROM), Whistler Resort, B.C., Canada.
Portland Cement Association. (2002). Design and control of concrete mixtures, 14th Ed., Skokie, Ill.
Schänzlin, J. (2003). “About the time dependent behavior of composite of board stacks and concrete.” Ph.D. thesis, Univ. of Stuttgart, Stuttgart, Germany (in German).
Steinberg, E., Selle, R., and Faust, T. (2003). “Connectors for timber-lightweight concrete composite structures.” J. Struct. Eng., 129(11), 1538–1545.
Weaver, C. A., Davids, W. G., and Dagher, H. J. (2004). “Testing and analysis of partially composite fiber-reinforced polymer-glulam-concrete bridge girders.” J. Bridge Eng., 9(4), 316–325.
Wieligmann, M., Gutkowski, R. M., and Haller, P. (2004). “Strain-stress-behavior of dowel connections for partially composite wood-concrete floors and decks.” Structural Research Rep. No. 87, Dept. of Civil Engineering, Colorado State Univ., Fort Collins, Colo.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 3 • March 2008
Pages: 430 - 439
Copyright
© 2008 ASCE.
History
Received: Jun 19, 2007
Accepted: Oct 3, 2007
Published online: Mar 1, 2008
Published in print: Mar 2008
Notes
Note. Associate Editor: Rakesh Gupta
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