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http://dx.doi.org/10.12989/cac.2019.24.2.103

Analytical, experimental and numerical study of timber-concrete composite beams for bridges  

Molina, Julio C. (Mechanical Engineering Department, University of Sao Paulo State - UNESP)
Calil, Carlito Junior (Department of Structural Engineering, Sao Carlos School of Engineering of the University of Sao Paulo)
de Oliveira, Diego R. (Wood Science and Engineering Department, Oregon State University)
Gomes, Nadia B. (Mechanical Engineering Department, University of Sao Paulo State - UNESP)
Publication Information
Computers and Concrete / v.24, no.2, 2019 , pp. 103-115 More about this Journal
Abstract
In this study, the strength and stiffness (EI) of wood-concrete composite beams for bridges with T-shaped cross section were evaluated. Two types of connectors were used: connectors bonded with epoxy adhesive and connectors attached to the wood just by pre-drilling (without adhesive). The connectors consisted of common steel bars with a diameter of 12.5 mm. Initially, the strength and stiffness (EI) of the beams were analyzed by bending tests with the load applied at the third point of the beam. Subsequently, the composite beams were evaluated by numerical simulation using ANSYS software with focus on the connection system. To make the composite beams, Eucalyptus citriodora wood and medium strength concrete were used. The slip modulus K and the ultimate strength values of each type of connector were obtained by direct shear tests performed on composite specimens. The results showed that the connector glued with epoxy adhesive resulted in better strength and stiffness (EI) for the composite beams when compared to the connector fixed by pre-drilling. The differences observed were up to 10%. The strength and stiffness (EI) values obtained analytically by $M{\ddot{o}}hler^{\prime}$ model were lower than the values obtained experimentally from the bending tests, and the differences were up to 25%. The numerical simulations allowed, with reasonable approximation, the evaluation of stress distributions in the composite beams tested experimentally.
Keywords
timber-concrete; composite beams; stiffness EI; strength; numerical simulation; steel bar connector; analytical $M{\ddot{o}}hler$ model;
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1 Dias, A.M.P.G. and Jorge, L.F.C. (2011), "The effect of ductile connectors on the behaviour of timber-concrete composite beams", Eng. Struct., 33(11), 3033-3042. https://doi.org/10.1016/j.engstruct.2011.05.014.   DOI
2 Eurocode 5 (2004), Design of Timber Structures. Part 1.1: General Rules and Rules Buildings, European Committee for Standardization, Brussels, Belgium.
3 Hill, R. (1950), The Mathematical Theory of Plasticity, Oxford at the Clarendon Press.
4 Maria, V.D. and Ianakiev, A. (2015), "Adhesives connections in Timber: A comparison between rough and smooth wood bonding surfaces", Int. Scholar. Sci. Res. Innov., 9(3), 395-401.
5 Miotto, J.L. and Dias, A.A. (2011), "Glulam-concrete composites: experimental investigation into the connection system", Mater. Res. (Sao Carlos. Impresso), 14(1), 53-59.   DOI
6 Miotto, J.L. and Dias, A.A.C. (2015), "Structural efficiency of full-scale timber-concrete composite beams strengthened with fiberglass reinforced polymer", Compos. Struct., 128(1), 145-154. https://doi.org/10.1016/j.compstruct.2015.03.054.   DOI
7 Molina, J.C. (2008), "Analysis of the dynamic behavior of the connectors formed by bonded-in steel rods for log-concrete composite deck bridges", PhD. Thesis, Sao Carlos School of Engineering of the University of Sao Paulo, Sao Paulo. (in Portuguese)
8 Molina, J.C. (2012), "Study of metallic connections of of wood and concrete composite systems in fire", Post-Doctoral Thesis, Sao Carlos School of Engineering of the University of Sao Paulo, Sao Paulo. (in Portuguese)
9 Molina, J.C. and Calil Junior, C. (2010), "Development of timberconcrete composite decks in Brazil", Struct. Eng., 88(5), 26-33.
10 Molina, J.C., Cheung, A.B. and Calil Junior, C. (2006), "Study of Mohler model in the probability of failure of wood and concrete composite strucutre", Proceedings of the XXXII Jornadas Sulamericanas de Engenharia Estrutural, Campinas, Brazil; May. (in Portuguese)
11 Molina, J.C., Silva, M.A.A.A. and Vasconcelos, R.P. (2015), "Verification of the efficiency of Mohler model in the response of the behavior of wood and concrete composite beams", Ambiente Construido, 15(1), 29-40. http://dx.doi.org/10.1590/S1678-86212015000100004. (in Portuguese)   DOI
12 Monteiro, S.R.S., Dias, A.M.P.G. and Lopes, S.M.R. (2015), "Bidimensional numerical modeling of timber-concrete slab-type structures", Mater. Struct., 48(1), 3391-3406. https://doi.org/10.1617/s11527-014-0407-3.   DOI
13 Pigozzo, J.C., Arroyo, F.N., Christoforo, A.L., Calil Junior, C. and Lahr, F.A.R. (2017), "Pull out strength evaluation of steel bar bonded-in to $45^{\circ}$ in round timber of Corymbia citriodora treated with CCA", Int. J. Mater. Eng., 7(2), 25-32. https://doi.org/10.5923/j.ijme.20170702.02.   DOI
14 Yeoh, D., Fagiacomo, M., Franceschi, M. and Buchanan, K.H. (2011), "Experimental tests of notched and plate connectors for LVL-Concrete composite beams", J. Struct. Eng., 137(2), 261-269. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000288.   DOI
15 Soriano, J. and Mascia, N.T. (2009), "Timber-concrete composite structures: a rational technique for bridges of vicinal roads", Ciencia Rural, 39(4), 1260-1269. http://dx.doi.org/10.1590/S0103-84782009005000032. (in Portuguese)
16 Tomasi, R., Crosatti, A. and Piazza, M. (2010), "Theoretical and experimental analysis of timber-timber joints connected with inclined screws", Constr. Build. Mater., 24(9), 1560-1571. https://doi.org/10.1016/j.conbuildmat.2010.03.007.   DOI
17 Valipour, H., Khorsandnia, N., Crews, K. and Palermo, A. (2016), "Numerical modelling of timber/timber-concrete composite frames with ductile jointed connection", Adv. Struct. Eng., 19(2), 299-313. https://doi.org/10.1177/1369433215624600.   DOI
18 ABNT NBR 5739 (2003), Concrete Compression Tests on Cylindrical Specimens, Brazilian Association of Technical Standards, Rio de Janeiro, Brazil.
19 Yttrup, P.J. and Nolan, G. (2001), "Performance of Timber Bridges in Tasmania", http://oak.arch.utas.edu.au, Ago. 28, 2001
20 ABNT NBR 5738 (2003), Concrete. Procedure for Molding and Specimens Cure, Brazilian Association of Technical Standards, Rio de Janeiro, Brazil.
21 ABNT NBR 6118 (2014), Design of Concrete Structures. Procedure, Brazilian Association of Technical Standards, Rio de Janeiro, Brazil.
22 ABNT NBR 7190 (1997), Design of Timber Structures, Brazilian Association of Technical Standards, Rio de Janeiro, Brazil.
23 ABNT NBR 7190 (2013), Design of Timber Structures, Revision Version, Brazilian Association of Technical Standards, Rio de Janeiro, Brazil.
24 Berardinucci, B., Nino, S., Gregori, A. and Fragiacomo, M. (2017), "Mechanical behavior of timber-concrete connections with inclined screws", Int. J. Comput. Meth. Exp. Measur., 5(6), 807-820.   DOI
25 ABNT NBR 8522 (2003), Concrete. Determination of Static Modules of Elasticity and of Strain and of the Curve Stress-Strain, Brazilian Association of Technical Standards, Rio de Janeiro, Brazil.
26 ANSYS Inc. (2004), http://www.ansys.com/products/structures
27 Baimbridge, R.J., Harvey, K. and Mettem, C.J. (2001), "Fatigue Performance of Structural Timber Connections", Proceedings of International Associations for Bridge and Structural Engineering Conference, Lahty, Finland, August.
28 Buchanan, A. and Moss, P. (1999), "Design of epoxied steel rods in glulam timber", Proceedings of the Pacific Timber Engineering Conference, Rotorua, New Zealand; March.
29 Dias, A.M.P.G. (2005), Mechanical Behaviour of Timber-Concrete Joints, University of Coimbra, Coimbra, District of Coimbra, Portugal.