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Rehabilitation of timber structures: novel test method to assess the durability of bonded-in rod connections

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Abstract

Rehabilitation/restoration systems involving bonded-in rods represent an efficient alternative method for the repair and/or reinforcement of structural timber members. However, in spite of their advantages, their use is still restrained by the lack of knowledge about their long-term performance. In order to correct this situation it is necessary to gain a greater understanding of their durability, creep and fatigue behaviour. However, reliable and realistic accelerated ageing tests do not yet exist, and the application of the existing European or American standards to epoxy bonded products are much too penalising, since they merely impose severe conditions that are not verified in service although these may be suitable for other adhesives. To address these concerns a test procedure to assess long-term behaviour of bonded-in rod connections was developed with the aim of providing a simple method for the selection of candidate repair system materials for specific applications. The data collected so far using the realistic performance assessment test (RPAT) appears to predict correctly the end-use performance for different adhesives as well as for different timbers.

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Notes

  1. The values in parentheses represent the creep variation in percentage.

  2. As the acceptance criteria were developed not only from this durability test, but also from other tests performed on the bulk adhesives, not presented here, it was decided not to include them in this article, and instead reference the author to the publication where the reader can have a global view of the development process of the acceptance criteria.

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Acknowledgments

This work was carried out at Oxford Brookes University within the scope of a PhD research project (SFRH/BD/17210/2004/DGW8) financed by “Fundação para a Ciência e a Tecnologia (Portugal, POCI 2010 – Formação Avançada para a Ciência – Medida IV.3)”. The authors wish to acknowledge this financial support.

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Authors and Affiliations

  1. Materials Department, Laboratório Nacional de Engenharia Civil (LNEC), Av. Brasil, 101, 1700-066, Lisbon, Portugal

    João Custódio

  2. Joining Technology Research Centre, School of Technology, Oxford Brookes University (OBU), Wheatley Campus, Oxford, OX33 1HX, UK

    James Broughton

  3. Structures Department, Laboratório Nacional de Engenharia Civil (LNEC), Av. Brasil, 101, 1700-066, Lisbon, Portugal

    Helena Cruz

Authors
  1. João Custódio
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  2. James Broughton
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  3. Helena Cruz
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Correspondence to João Custódio.

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Custódio, J., Broughton, J. & Cruz, H. Rehabilitation of timber structures: novel test method to assess the durability of bonded-in rod connections. Mater Struct 45, 199–221 (2012). https://doi.org/10.1617/s11527-011-9760-7

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  • DOI: https://doi.org/10.1617/s11527-011-9760-7

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