Hygro-mechanically coupled modelling of creep in wooden structures, Part I: Mechanics

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:77

Article

Reichel, Susanne¹  Kaliske, Michael¹ 

[1] Tech Univ Dresden, Inst Struct Anal, D-01062 Dresden, Germany

关键词: Wood mechanics;    Material properties;    Creep;    Non-linearity;    Failure;   

DOI  :  10.1016/j.ijsolstr.2015.07.019

来源: Elsevier

【 摘 要 】

In the paper at hand, a modelling approach for the simulation of the anisotropic long-term behaviour of wooden structures subjected to mechanical loading at constant moisture content for the use within the framework of the Finite Element Method is presented. Using a standard-solid body-model in serial combination with a BINGHAM-element allows for the differentiation between linear viscoelastic and non-linear viscoelastic-viscoplastic behaviour with respect to the applied stress level. Creep failure is considered by means of the concept of strain-energy density. Due to the cylindrical anisotropy of wood, the four material properties required for the description of the creep behaviour are determined depending on material direction and loading type (tension, compression, shear) by means of the re-calculation of experimental results. Finally the approach is applied to the re-calculation of two test-series in bending and to the analysis of a face staggered joint. The paper at hand is the first part of a more complex model and deals with the mechanical long-term behaviour of wood. In the second part, the hygro-mechanical coupling is covered with respect to the consideration of the influence of moisture content on mechanically induced creep and mechano-sorptive effects caused by simultaneous mechanical loading and moisture changes. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free