Modelling of bending creep of low-and high-temperature-dried spruce timber
Journal article, 2013

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.

Author

Daniel Honfi

Lund University

Mårtensson Annika

Lund University

Sven Thelandersson

Lund University

Robert Kliger

Chalmers, Civil and Environmental Engineering, Structural Engineering

Wood Science and Technology

0043-7719 (ISSN) 1432-5225 (eISSN)

1 23-36

Areas of Advance

Building Futures (2010-2018)

Subject Categories

Other Civil Engineering

DOI

10.1007/s00226-013-0581-4

More information

Latest update

3/2/2018 9