Browse > Article
http://dx.doi.org/10.12989/sem.2020.73.3.353

Timber-FRP composite beam subjected to negative bending  

Subhani, Mahbube (School of Engineering, Deakin University)
Globa, Anastasia (School of Architecture, Design and Planning, University of Sydney)
Moloney, Jules (School of Design, RMIT University)
Publication Information
Structural Engineering and Mechanics / v.73, no.3, 2020 , pp. 353-365 More about this Journal
Abstract
In the previous studies, the authors proposed the use of laminated veneer lumber - carbon fiber reinforced polymer (LVL-CFRP) composite beams for structural application. Bond strength of the LVL-to-CFRP interface and flexural strengthening schemes to increase the bending capacity subjected to positive and negative moment were discussed in the previous works. In this article, theoretical models are proposed to predict the moment capacity when the LVL-CFRP beams are subjected to negative moment. Two common failure modes - CFRP fracture and debonding of CFRP are considered. The non-linear model proposed for positive moment is modified for negative moment to determine the section moment capacity. For the debonding based failure, previously developed bond strength model for CFRP-to-LVL interface is implemented. The theoretical models are validated against the experimental results and then use to determine the moment-rotation behaviour and rotational rigidity to compare the efficacy of various strengthening techniques. It is found that combined use of bi- and uni-directional CFRP U-wrap at the joint performs well in terms of both moment capacity and rotational rigidity.
Keywords
CFRP, LVL; negative moment; composites; analytical modelling; moment-rotation;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
연도 인용수 순위
1 Biscaia, H.C., Chastre, C., Cruz, D. and Franco, N. (2016), "Flexural Strengthening of Old Timber Floors with Laminated Carbon Fiber-Reinforced Polymers", J. Compos. Construct., 21(1). https://doi.org/10.1061/(ASCE)CC.1943-5614.0000731.
2 Biscaia, H.C., Chastre, C., Cruz, D. and Viegas, A. (2017), "Prediction of the interfacial performance of CFRP laminates and old timber bonded joints with different strengthening techniques", Compos. Part B Eng., 108, 1-17. https://doi.org/10.1016/j.compositesb.2016.09.097   DOI
3 Biscaia, H.C., Cruz, D. and Chastre, C. (2016), "Analysis of the debonding process of CFRP-to-timber interfaces", Consruct. Build. Mater., 113, 96-112. https://doi.org/10.1016/j.conbuildmat.2016.03.033   DOI
4 Chun, Q., Balen, K.V. and Pan, J. (2016), "Flexural Performance of Small Fir and Pine Timber Beams Strengthened With Near-Surface Mounted Carbon-Fiber-Reinforced Polymer (NSM CFRP) Plates and Rods", J. Architect. Heritage, 10(1), 106-117. https://doi.org/10.1080/15583058.2014.971195
5 D'Ambrisi, A., Focacci, F. and Luciano, R. (2014), "Experimental investigation on flexural behavior of timber beams repaired with CFRP plates", Compos. Struct., 108, 720-728. https://doi.org/10.1016/j.compstruct.2013.10.005   DOI
6 De la Rosa Garcia, P., Escamilla, A.C. and Garcia, M.N.G. (2013), "Bending reinforcement of timber beams with composite carbon fiber and basalt fiber materials", Compos. Part B Eng., 55, 528-536. https://doi.org/10.1016/j.compositesb.2013.07.016   DOI
7 De la Rosa Garcia, P., Escamilla, A.C. and Garcia, M.N.G. (2016), "Analysis of the flexural stiffness of timber beams reinforced with carbon and basalt composite materials", Compos. Part B Eng., 86, 152-159. https://doi.org/10.1016/j.compositesb.2015.10.003   DOI
8 De Lorenzis, L., Scialpi, V. and La Tegola, A. (2005), "Analytical and experimental study on bonded-in CFRP bars in glulam timber", Compos. Part B Eng., 36(4), 279-289. https://doi.org/10.1016/j.compositesb.2004.11.005
9 Fossetti, M., Minafo, G. and Papia, M. (2015), "Flexural behaviour of glulam timber beams reinforced with FRP cords", Consruct. Build. Mater., 95, 54-64. https://doi.org/10.1016/j.conbuildmat.2015.07.116   DOI
10 Fiorelli, J. and Dias, A.A. (2003), "Analysis of the strength and stiffness of timber beams reinforced with carbon fiber and glass fiber", Mater. Res., 6(2), 193-202. http://dx.doi.org/10.1590/S1516-14392003000200014   DOI
11 Globa, A., Subhani, M., Moloney, J. and Al-Ameri, R. (2018), "Carbon Fiber and Structural Timber Composites for Engineering and Construction", J. Architect. Eng., 24(3). https://doi.org/10.1061/(ASCE)AE.1943-5568.0000318.   DOI
12 Guan, Z. and Rodd, P. (2003), "Modelling of timber joints made with steel dowels and locally reinforced by DVW discs", Struct. Eng. Mech., 16(4), 391-404. https://doi.org/10.12989/sem.2003.16.4.391   DOI
13 Juvandes, L. and Barbosa, R. (2012), "Bond Analysis of Timber Structures Strengthened with FRP Systems", Strain, 48(2), 124-135. https://doi.org/10.1111/j.1475-1305.2011.00804.x   DOI
14 Khelifa, M., Auchet, S., Meausoone, P.J. and Celzard, A. (2015), "Finite element analysis of flexural strengthening of timber beams with Carbon Fibre-Reinforced Polymers", Eng. Struct., 101, 364-375. https://doi.org/10.1016/j.engstruct.2015.07.046   DOI
15 Khelifa, M. and Celzard, A. (2014), "Numerical analysis of flexural strengthening of timber beams reinforced with CFRP strips", Compos. Struct., 111, 393-400. https://doi.org/10.1016/j.compstruct.2014.01.011   DOI
16 Khelifa, M., Lahouar, M.A. and Celzard, A. (2015), "Flexural strengthening of finger-jointed Spruce timber beams with CFRP", J. Adhesion Sci. Technol., 29(19), 2104-2116. https://doi.org/10.1080/01694243.2015.1057395   DOI
17 Li, Y.-F., Xie, Y.-M. and Tsai, M.-J. (2009), "Enhancement of the flexural performance of retrofitted wood beams using CFRP composite sheets", Consruct. Build. Mater., 23(1), 411-422. https://doi.org/10.1016/j.conbuildmat.2007.11.005   DOI
18 Nowak, T.P., Jasienko, J. and Czepizak, D. (2013), "Experimental tests and numerical analysis of historic bent timber elements reinforced with CFRP strips", Consruct. Build. Mater., 40, 197-206. https://doi.org/10.1016/j.conbuildmat.2012.09.106   DOI
19 Micelli, F., Scialpi, V. and La Tegola, A. (2005), "Flexural reinforcement of glulam timber beams and joints with carbon fiber-reinforced polymer rods", J. Compos. Construct., 9(4), 337-347. https://doi.org/10.1061/(ASCE)1090-0268(2005)9:4(337)   DOI
20 Miljanovic, S. and Zlatar, M. (2015), "Theoretical and experimental research of external prestressed timber beams in variable moisture conditions", Coupled Syst. Mech., 4(2), 191-209. https://doi.org/10.12989/csm.2015.4.2.191   DOI
21 Raftery, G.M. and Harte, A.M. (2011), "Low-grade glued laminated timber reinforced with FRP plate", Compos. Part B Eng., 42(4), 724-735. https://doi.org/10.1016/j.compositesb.2011.01.029   DOI
22 Schober, K.-U., Harte, A.M., Kliger, R., Jockwer, R., Xu, Q. and Chen, J.-F. (2015), "FRP reinforcement of timber structures", Consruct. Build. Mater., 97, 106-118. https://doi.org/10.1016/j.conbuildmat.2015.06.020   DOI
23 Schober, K. and Rautenstrauch, K. (2005). "Experimental investigation on flexural strengthening of timber structures with CFRP", Proceedings of the International Symposium on Bond Behavior of FRP in Structures, Hong Kong, December.
24 Smith, S.T. (2011), Strengthening of concrete, metallic and timber construction materials with FRP composites, Springer, Berlin, Germany.
25 Xue, J., Qi, L., Dong, J. and Xu, D. (2018), "Analytical investigation on moment-rotation relationship of through-tenon joints with looseness in ancient timber buildings", Earthq. Struct., 14(3), 241-248. https://doi.org/10.12989/eas.2018.14.3.241   DOI
26 Subhani, M., Globa, A., Al-Ameri, R. and Moloney, J. (2017), "Effect of grain orientation on the CFRP-to-LVL bond", Compos. Part B Eng., 129, 187-197. https://doi.org/10.1016/j.compositesb.2017.07.062   DOI
27 Subhani, M., Globa, A., Al-Ameri, R. and Moloney, J. (2017), "Flexural strengthening of LVL beam using CFRP", Consruct. Build. Mater., 150, 480-489. https://doi.org/10.1016/j.conbuildmat.2017.06.027   DOI
28 Alhayek, H. and Svecova, D. (2012), "Flexural stiffness and strength of GFRP-reinforced timber beams", J. Compos. Construct., 16(3), 245-252. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000261   DOI
29 Allotey, N. and Foschi, R. (2005), "Frictional effects on the cyclic response of laterally loaded timber fasteners", Struct. Eng. Mech., 21(1), 1-18. https://doi.org/10.12989/sem.2005.21.1.001   DOI
30 Wan, J., Smith, S.T. and Qiao, P. (2011), FRP-to-softwood Joints: Experimental Investigation, Springer, Berlin, Germany.