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

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Modelling of bending creep of low- and high-temperature-dried spruce timber. / Honfi, Daniel; Mårtensson, Annika; Thelandersson, Sven; Kliger, Robert.

In: Wood Science and Technology, 2013.

Research output: Contribution to journalArticle

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TY - JOUR

T1 - Modelling of bending creep of low- and high-temperature-dried spruce timber

AU - Honfi, Daniel

AU - Mårtensson, Annika

AU - Thelandersson, Sven

AU - Kliger, Robert

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

KW - Timber

KW - Creep

KW - Mechano-sorption

KW - Drying

U2 - 10.1007/s00226-013-0581-4

DO - 10.1007/s00226-013-0581-4

M3 - Article

JO - Wood Science and Technology

JF - Wood Science and Technology

SN - 1432-5225

ER -