Modelling of bending creep of low-and high-temperature-dried spruce timber
Artikel i vetenskaplig tidskrift, 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.

Författare

Daniel Honfi

Lunds universitet

Mårtensson Annika

Lunds universitet

Sven Thelandersson

Lunds universitet

Robert Kliger

Chalmers, Bygg- och miljöteknik, Konstruktionsteknik

Wood Science and Technology

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

23-36

Styrkeområden

Building Futures

Ämneskategorier

Annan samhällsbyggnadsteknik

DOI

10.1007/s00226-013-0581-4