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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29769

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Creep Behaviour of Heterogeneous Timber-UHPFRC Beams Assembled by Bonding: Experimental and Analytical Investigation
The purpose of this research was to investigate the creep behaviour of the heterogeneous Timber-UHPFRC beams. New developments have been done to further improve the structural performance, such as strengthening of the timber (glulam) beam by bonding composite material combine with an ultra-high performance fibre reinforced concrete (UHPFRC) internally reinforced with or without carbon fibre reinforced polymer (CFRP) bars. However, in the design of wooden structures, in addition to the criteria of strengthening and stiffness, deformability due to the creep of wood, especially in horizontal elements, is also a design criterion. Glulam, UHPFRC and CFRP may be an interesting composite mix to respond to the issue of creep behaviour of composite structures made of different materials with different rheological properties. In this paper, we describe an experimental and analytical investigation of the creep performance of the glulam-UHPFRC-CFRP beams assembled by bonding. The experimental investigations creep behaviour was conducted for different environments: in- and outside under constant loading for approximately a year. The measured results are compared with numerical ones obtained by an analytical model. This model was developed to predict the creep response of the glulam-UHPFRCCFRP beams based on the creep characteristics of the individual components. The results show that heterogeneous glulam-UHPFRC beams provide an improvement in both the strengthening and stiffness, and can also effectively reduce the creep deflection of wooden beams.
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[1] H. S. Pham, “Optimisation et comportement en fatigue de la connexion bois-BFUP pour de nouveaux ponts mixtes,” Docteur de l’Ecole Nationale des Ponts et Chaussées, 2007.
[2] Gary M.Raftery, “Bonding of FRP materials to wood using thin epoxy gluelines,” Int. J. Adhes. Adhes., vol. 29, pp. 580–588, 2009.
[3] R. Gutkowski, K. Brown, A. Shigidi, J. Natterer, “Laboratory tests of composite wood–concrete beams,” Constr. Build. Mater., vol. 22, pp. 1059–1066, 2008.
[4] E. Ferrier, A. Agbossou, and L. Michel, “Mechanical behaviour of ultrahigh- performance fibrous-concrete wood panels reinforced by FRP bars,” Compos. Part B, vol. 60, pp. 663–672, 2014.
[5] J. Kanócz and V. Bajzecerová, “Influence of rheological behaviour on load-carrying capacity of timber concrete composite beams under long term loading,” Steel Struct. Bridg., vol. 40, pp. 20–25, 2012.
[6] M. Yahyaei-Moayyed, F. Taheri, “Experimental and computational investigations into creep response of AFRP reinforced timber beams,” Compos. Struct., vol. 93, pp. 616–628, 2011.
[7] ASTM-D198, “Standard Test Methods of Static Tests of Lumber in Structural Sizes,” 2003.
[8] José Sena-Cruz, Marco Jorge, Jorge M. Branco, Vítor M.C.F. Cunha, “Bond between glulam and NSM CFRP laminates,” Constr. Build. Mater., vol. 40, pp. 260–269, 2013.
[9] Martin Schäfers, “Investigation on bonding between timber and ultrahigh performance concrete (UHPC),” Constr. Build. Mater., vol. 25, pp. 3078–3088, 2011.
[10] CEN, “Eurocode 5 –Design of Timber Structures – Part 1-1: General Rules and Rules for Buildings,” Comité Européen de Normalisation, Bruxelles, Belgium, 1995.
[11] N. Khorsandnia, J. Schӓnzlin, H. Valipour, and K. Crews, “Timedependent behaviour of timber–concrete composite members: Numerical verification, sensitivity and influence of material properties,” Constr. Build. Mater., vol. 66, pp. 192–208, 2014.
[12] A. Ceccotti, “Long-term and collapse tests on a timber-concrete composite beam with glued-in connection,” Mater. Struct., vol. 40, pp. 15–25, 2006.
[13] M. Fragiacomo, “Simplified approach for the long-term behaviour of timber-concrete composite beams according to the Eurocode 5 provisions,” Italy, 2006.
[14] A. Hanhifirvi, “Computational method for predicting the long-term performance of timber beams in variable climates,” Mater. Struct. Constr., vol. 33, pp. 127–134, 2000.
[15] AFGC, “Bétons fibrés à ultra-hautes performances Ultra High Performance Fibre-Reinforced Concretes.” par le groupe de travail AFGC / SETRA, 2002.
[16] T. V. Toratti, “Service limit states: Effects of duration of load and moisture on deformations,” Cost E24 Reliability of Timber structures, Florence, 2004.
[17] Aicha Kamen, “Comportement au jaune âge et différé d’un BFUP écrouissant sous les effets thermomécanique,” Ecole polytechnique fédérale de Lausanne, 2007.
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