Moment-Curvature Analysis of Coupled Bending and Mechanosorptive Response of Red Spruce Beams

Published: 2011

Author(s):
Shaler, S.
Davids, W. G.
Muszynski, L.
Lagana, R.

Publication Name: Wood and Fiber Science

Publication URL: https://www.researchgate.net/publication/287849476_Moment-curvature_analysis_of_coupled_bending_and_mechanosorptive_response_of_red_spruce_beams

Research Area:
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Abstract:

In this study, an expanded comprehensive numerical approach to predict hygromechanical behavior of beams is proposed that rigorously couples spatially varying time-dependent moisture content fluctuation with uniaxial stress-strain relations. The constitutive model, consisting of elastic, viscoelastic, and two mechanosorptive strain elements connected in series, was used in a layered moment-curvature flexural analysis. The procedure is numerical and is able to take into account effect of moisture content changes, different mechanosorptive behavior in tension and compression, and cross-sectional hygroexpansion. The overall trend and magnitude of predicted deflections are in good agreement with experimental results. Results demonstrated that complex beam behavior in a varying environment can be predicted by a simple model with well-defined material characteristics generated through relatively simple 18-h uniaxial experiments.