Bending Strength of Timber Beams Rehabilitated with Reinforced Epoxy Mortar Plates
Publication: Journal of Structural Engineering
Volume 134, Issue 5
Abstract
The need for restoration of the built heritage increases the demand for new strengthening and rehabilitation techniques of structures. This paper discusses a rehabilitation system for timber beams, consisting of the replacement of the decayed parts by new ones of nearly the same material, connected to the sound parts by reinforced epoxy mortar plates. The use of this technique allows for lighter and less intrusive works, compatible with the normal building occupation during the rehabilitation process. The experimental analysis undertaken focused on the flexural bonding behavior with stainless steel, reinforcement steel, and glass fiber reinforced plastic bars being used as alternatives. A simple analytical model, based on the usual assumptions of the bending theory, is proposed, leading to a reasonable agreement with the experimental results. In spite of a reduction of strength when compared to the original elements, the safety level of the rehabilitated elements is high enough to comply with the Eurocode 5 requirements and is, therefore, suitable for actual works.
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Acknowledgments
The writers wish to thank the Portuguese Foundation for Science and Technology (FCT) and the Science and Innovation Operational Program (POCI 2010), cofinanced by the European Union Fund FEDER, for the support provided through the Research Project No. UNSPECIFIEDPOCI/ECM/60089/2004. Thanks to SIKA AG as well, for the frequent offer of their products.
References
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European Committee for Standardization (CEN). (2004a). “Adhesives for load-bearing timber structures—Test methods. Part 4: Determination of the effects of wood shrinkage on the shear strength.” EN 302-4, CEN, Brussels, Belgium.
European Committee for Standardization (CEN). (2004b). “Design of timber structures—Part 1.1: General—Common rules and rules for buildings.” EN 1995-1-1-Eurocode 5, CEN, Brussels, Belgium.
European Committee for Standardization (CEN). (2006). “Adhesives, phenolic and aminoplastic, for load-bearing timber structures: Classification and performance requirements.” EN 301, CEN, Brussels, Belgium.
Freas, A. (1982). “Evaluation, maintenance and upgrading of wood structures.” ASCE, Reston, Va.
Gemert, D. V., and Bosch, M. V. (1987). “Structural restoration of wooden beams by means of epoxy resin.” Materials and Structures/Materiaux et Construction, Springer, The Netherlands.
Instituto Português da Qualidade (IPQ). (1995). “Madeira serrada de pinheiro bravo para estruturas—Classificação visual.” NP 4305, IPQ, Portugal (in Portuguese).
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 5 • May 2008
Pages: 792 - 800
Copyright
© 2008 ASCE.
History
Received: Feb 6, 2007
Accepted: Oct 8, 2007
Published online: May 1, 2008
Published in print: May 2008
Notes
Note. Associate Editor: Rakesh Gupta
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