Graduate Thesis Or Dissertation
 

Evaluation of creep behavior of structural lumber in a natural environment

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/w9505257f

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  • In order to describe long term creep behavior of structural lumber in a natural environment, a bending test with twenty Douglas-Fir beams subjected to a constant load was set up in an open shed in the Forest Research Laboratory at Oregon State University. Deflections of the beams were measured along with daily fluctuations in temperature and relative humidity. An existing five-element creep model was used to predict the creep strain and compared to the experimental data. The model did not predict creep behavior of structural lumber in a natural environment. The general observations showed that stiffness of the beams has a strong influence on the magnitude of creep strain, and the creep strain closely follows the fluctuations in air temperature. The mechano-sorptive creep strain in this experiment is likely to be the shrinking and swelling on the surfaces of the beam and is not tied to the moisture content (MC) of the entire beam, which changed very little over a one year period. Four-element Burger model and power law empirical model were modified to include the stiffness of the beams and air temperature effects. Both models fit the experimental data very well.
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