Mechano-sorptive structural analysis of wood by the ABAQUS finite element program

Kari Santaoja, Tapio Leino, Alpo Ranta-Maunus, Antti Hanhijärvi

Research output: Book/ReportReport


A structural analysis method for the long-term response of wooden structures is presented in this publication. The utilization of this analysis tool requires the following three components: - an effective computer (Cray X-MP); - a finite element (FE-) program for non-linear analysis of structures (ABAQUS); - the implementation scheme of the stress-strain relation for wood into the FE-program (subroutine UMAT). The third component was developed at The Technical Research Centre of Finland (VTT) and is introduced here. The mechanical properties of timber in its cross-sectional plane were considered homogeneous and cylindrically orthotropic, i.e. the local effects of the annual rings were ignored. The response of wood to mechanical loading and moisture changes was modelled using three strain terms: linear elastic strain, free moisture expansion and mechano-sorptive creep, which takes the combined effect of moissure change and mechanical loading into account. Viscoelastic creep accommodated with pure mechanical loading was ignored. The use of ABAQUS for detailed stress analysis of wood is demonstrated with examples.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages54
ISBN (Print)951-38-4009-3
Publication statusPublished - 1991
MoE publication typeNot Eligible

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tiedotteita


  • finite element analysis
  • computer programs
  • mathematical models
  • structural analysis
  • structural timber
  • structures
  • wooden structures
  • timber construction
  • mechanical properties
  • moisture
  • humidity
  • loads (forces)
  • stress analysis


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