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

Honfi, Daniel LU ; Mårtensson, Annika LU ; Thelandersson, Sven LU and Kliger, Robert (2013) In Wood Science and Technology
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Timber, Creep, Mechano-sorption, Drying
in
Wood Science and Technology
publisher
Springer
external identifiers
  • wos:000330626100004
  • scopus:84893106303
ISSN
1432-5225
DOI
10.1007/s00226-013-0581-4
language
English
LU publication?
yes
id
f6c67bfd-436e-4962-8535-11144c076e76 (old id 4091672)
date added to LUP
2013-10-14 08:09:17
date last changed
2019-04-10 02:00:52
@article{f6c67bfd-436e-4962-8535-11144c076e76,
  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.},
  author       = {Honfi, Daniel and Mårtensson, Annika and Thelandersson, Sven and Kliger, Robert},
  issn         = {1432-5225},
  keyword      = {Timber,Creep,Mechano-sorption,Drying},
  language     = {eng},
  publisher    = {Springer},
  series       = {Wood Science and Technology},
  title        = {Modelling of bending creep of low- and high-temperature-dried spruce timber},
  url          = {http://dx.doi.org/10.1007/s00226-013-0581-4},
  year         = {2013},
}