Creep behaviour and creep recovery of FRP reinforced timber elements

The use of reinforcement in timber beams has been shown to improve the short-term flexural behaviour but the long-term behaviour is often more complex, particularly when subjected to a variable climate condition. In this study, the creep deflection behaviour of unreinforced and basalt fibre reinforc...

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Bibliographic Details
Published inWood material science and engineering Vol. 20; no. 4; pp. 769 - 777
Main Authors O'Ceallaigh, Conan, McGetrick, Patrick J., Walsh, Thomas, Moran, Gary, Sikora, Karol, McPolin, Daniel, Harte, Annette M.
Format Journal Article
LanguageEnglish
Published Taylor & Francis 04.07.2025
Subjects
Basalt fibre
creep behaviour
creep recovery
engineered wood products
reinforced timber
Sitka spruce
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Summary:The use of reinforcement in timber beams has been shown to improve the short-term flexural behaviour but the long-term behaviour is often more complex, particularly when subjected to a variable climate condition. In this study, the creep deflection behaviour of unreinforced and basalt fibre reinforced polymer (FRP) reinforced beams were subjected to creep tests at a common maximum compressive stress of 8 MPa over a 450-week (≈ 8.5 years) period. This study built upon data previously presented by the authors for a test period of 75 weeks. Furthermore, the tested elements were unloaded, and the creep recovery data was also presented. A significant reduction in total creep deflection due to the FRP reinforcement was observed in the results obtained in both a variable and constant climate. Once unloaded, the results indicate that a significant proportion of creep can be recovered when subjected to a constant climate, however, when subject to a variable climate, there appears to be a significant proportion of non-recoverable deformation.
ISSN:1748-0272
1748-0280
DOI:10.1080/17480272.2025.2480248