CREEP-BEHAVIOR OF STRUCTURAL TIMBER UNDER VARYING HUMIDITY CONDITIONS

Authors
Citation
A. Martensson, CREEP-BEHAVIOR OF STRUCTURAL TIMBER UNDER VARYING HUMIDITY CONDITIONS, Journal of structural engineering, 120(9), 1994, pp. 2565-2582
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Engineering, Civil","Construcion & Building Technology
ISSN journal
0733-9445
Volume
120
Issue
9
Year of publication
1994
Pages
2565 - 2582
Database
ISI
SICI code
0733-9445(1994)120:9<2565:COSTUV>2.0.ZU;2-O
Abstract
The effects on wood of simultaneous mechanical and moisture loading ar e studied. A constitutive model is given for the case of uniaxial stre ss in the longitudinal direction. The model has been quantified on the basis of test results found in literature. The validity of the model was checked independently against other tests and a number of practica l load situations were studied. Finally the serviceablity requirements for design are discussed. The calculations show that the model is cap able of describing the response of wood with reasonable accuracy. Some differences in behavior arc found to depend on moisture cycling. The results of the simulations show that there is a significant influence of strain on the shrinkage and swelling response. An influence of beam dimensions has been found. The relative deflection for a small beam i s larger than the deflection for a larger beam. Studies of the effect of varying load show that a temporarily applied load has little effect on the long-term deflection of structural timber. A simulation of sno w-load variation shows that the long-term deflections are small in com parison with the case when the characteristic load is assumed to be co nstant over time.