Moisture content adjustments for dynamic modulus of elasticity of wood members |
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| Authors: | J David Barrett Jung-Pyo Hong |
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| Institution: | (1) Department of Wood Science, The University of British Columbia, 2424 Main Mall, Vancouver, BC, V6T-1Z4, Canada |
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| Abstract: | The influence of moisture content (MC) on the dynamic modulus of elasticity of structural lumber was investigated using transverse
vibration testing methods. The flexural rigidity (EI) of a transversely vibrating beam was calculated as the modulus of elasticity (E) multiplied by the moment of inertia (I). The increase in E of lumber due to reduction in moisture content was computed by assuming that the flexural rigidity remains constant with
changes in moisture content. Reductions in I due to shrinkage were compensated by the increases in E which led to a proposal for a species-dependent MC adjustment model for modulus of elasticity. The model was validated using
38 mm × 89 mm × 4,290 mm western Canadian Spruce–Pine–Fir dimension lumber evaluated in the “as-received” and “dry” conditions.
Results obtained from the species-dependent model agreed closely with those from the E adjustment equation for dimension lumber given in ASTM D 1990. The results show that the ASTM moisture adjustment procedures
can be used to adjust dynamic E values for changes in moisture content also. |
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