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Keywords: composite structures, timber structures, beams, computational analysis.

Summary

The self-weight of concrete structures is an important portion of the overall load applied to the structures. The solution of timber-concrete beams using lightweight concrete could be competitive because of the weight reduction. Research works related to timber-concrete slabs have being carried out at the University of Coimbra for some years [1,2,3]. This article presents a numerical study of these structures. There is not a specific Eurocode which deals with timber-concrete composite structures and the designers must find some rules in technical articles complemented with adaptable rules from Eurocodes 2 and 5 [4,5].

A parametric study on the most economical solution, normal weight concrete or lightweight concrete, for timber concrete composite slabs is presented in this paper. For slabs with spans above 6 metres, lightweight concrete is competitive.

Some flexural tests were carried out in T section timber concrete composite beams.

The type of load deflection curves of these beams is very different from that of reinforced concrete beams. Typical load-deflection diagrams for notch and screw timber-concrete composite beams are shown in the paper. In spite of identical failure causes (bending-tension of the timber element) of both solutions, the notch beam has a linear behaviour up to failure, whereas the screw beam presents a non linear load deflection curve.

References

1: L.F.C. Jorge, S.M.R. Lopes, H.M.P. Cruz, "Experimental Research in Timber-LWAC Composite Structures", International Symposium on Advanced Timber and Timber-Composite Elements for Building, C.N.R. Research Centre & Cost E29, Florence, 27-29, October, 2004, 97-104, 2004.
2: A.M.P.G. Dias, S.M.R. Lopes, J.W. van de Kuilen, H.M.P. Cruz, "Load Carrying Capacity of Timber-Concrete Joints with Dowel Type Fasteners", ASCE Journal of Structural Engineering, 133(5), 720-727, 2007. doi:10.1061/(ASCE)0733-9445(2007)133:5(720)
3: A.M.P.G. Dias, J.W. van de Kuilen, S.M.R. Lopes, H.M.P. Cruz, "A Non-Linear 3D FEM Model to Simulate Timber-Concrete Joints", Advances in Engineering Software, 38(8-9), 522-530, 2007. doi:10.1016/j.advengsoft.2006.08.024
4: CEN. EN 1992-1, "Eurocode 2: Design of concrete structures- Part 1: general rules for buildings", 2002.
5: CEN. EN 1995, "Eurocode 5: Design of timber structures. Part 1-1: General - Common rules and rules for buildings", 2004.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 91 PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping, L.F. Costa Neves and R.C. Barros Paper 5 Numerical Modelling of Non-Linear Behaviour of Timber-Concrete Composite Structures S.M.R. Lopes¹, L.F.C. Jorge² and H.M.P. Cruz³ ¹Department of Civil Engineering, University of Coimbra, Portugal ²Department of Civil Engineering, Polytechnic Institute of Castelo Branco, Portugal ³National Laboratory of Civil Engineering, Lisbon, Portugal doi:10.4203/ccp.91.5 purchase the full-text of this paper Full Bibliographic Reference for this paper S.M.R. Lopes, L.F.C. Jorge, H.M.P. Cruz, "Numerical Modelling of Non-Linear Behaviour of Timber-Concrete Composite Structures", in B.H.V. Topping, L.F. Costa Neves, R.C. Barros, (Editors), "Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 5, 2009. doi:10.4203/ccp.91.5 Keywords: composite structures, timber structures, beams, computational analysis. Summary The self-weight of concrete structures is an important portion of the overall load applied to the structures. The solution of timber-concrete beams using lightweight concrete could be competitive because of the weight reduction. Research works related to timber-concrete slabs have being carried out at the University of Coimbra for some years [1,2,3]. This article presents a numerical study of these structures. There is not a specific Eurocode which deals with timber-concrete composite structures and the designers must find some rules in technical articles complemented with adaptable rules from Eurocodes 2 and 5 [4,5]. A parametric study on the most economical solution, normal weight concrete or lightweight concrete, for timber concrete composite slabs is presented in this paper. For slabs with spans above 6 metres, lightweight concrete is competitive. Some flexural tests were carried out in T section timber concrete composite beams. The type of load deflection curves of these beams is very different from that of reinforced concrete beams. Typical load-deflection diagrams for notch and screw timber-concrete composite beams are shown in the paper. In spite of identical failure causes (bending-tension of the timber element) of both solutions, the notch beam has a linear behaviour up to failure, whereas the screw beam presents a non linear load deflection curve. References 1 L.F.C. Jorge, S.M.R. Lopes, H.M.P. Cruz, "Experimental Research in Timber-LWAC Composite Structures", International Symposium on Advanced Timber and Timber-Composite Elements for Building, C.N.R. Research Centre & Cost E29, Florence, 27-29, October, 2004, 97-104, 2004. 2 A.M.P.G. Dias, S.M.R. Lopes, J.W. van de Kuilen, H.M.P. Cruz, "Load Carrying Capacity of Timber-Concrete Joints with Dowel Type Fasteners", ASCE Journal of Structural Engineering, 133(5), 720-727, 2007. doi:10.1061/(ASCE)0733-9445(2007)133:5(720) 3 A.M.P.G. Dias, J.W. van de Kuilen, S.M.R. Lopes, H.M.P. Cruz, "A Non-Linear 3D FEM Model to Simulate Timber-Concrete Joints", Advances in Engineering Software, 38(8-9), 522-530, 2007. doi:10.1016/j.advengsoft.2006.08.024 4 CEN. EN 1992-1, "Eurocode 2: Design of concrete structures- Part 1: general rules for buildings", 2002. 5 CEN. EN 1995, "Eurocode 5: Design of timber structures. Part 1-1: General - Common rules and rules for buildings", 2004. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £140 +P&P)
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