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Modelling of bending creep of low- and high-temperature-dried spruce timber

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Abstract

In the current project, a finite element model is developed to analyse the long-term behaviour of timber beams. The time-dependent response of wood subjected to bending and moisture changes is investigated in terms of strains and stresses. A rheological model is implemented to capture the effects of creep, mechano-sorption and hygroexpansion. The model is validated against test results from Bengtsson and Kliger (Holzforschung 57:95–100, 2003). The results of the analysis showed that the mechano-sorptive creep of low- (LT) and high-temperature-dried (HT) timber beams can be sufficiently modelled with a spring and a single Kelvin body. The different mechano-sorptive behaviour of LT- and HT-dried specimens is considered with different mechano-sorptive and shrinkage–swelling parameters. The presented model could be used to derive general mechano-sorptive parameters: (1) for better prediction of creep over the service life and (2) to provide a basis of time-dependent probabilistic calculations for structural-sized timber in serviceability limit state.

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Authors and Affiliations

  1. Division of Structural Engineering, Lund University, Box 118, 221 00, Lund, Sweden

    D. Honfi, A. Mårtensson & S. Thelandersson

  2. Division of Structural Engineering, Chalmers University of Technology, 412 96, Gothenburg, Sweden

    R. Kliger

Authors
  1. D. Honfi
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  2. A. Mårtensson
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  3. S. Thelandersson
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  4. R. Kliger
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Correspondence to D. Honfi.

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Honfi, D., Mårtensson, A., Thelandersson, S. et al. Modelling of bending creep of low- and high-temperature-dried spruce timber. Wood Sci Technol 48, 23–36 (2014). https://doi.org/10.1007/s00226-013-0581-4

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  • DOI: https://doi.org/10.1007/s00226-013-0581-4

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