Nondestructive Strength and Rehabilitation Assessment of Wood-Based Structures

摘要

Currently, no nondestructive evaluation (NDE) method exists which can define the strength of individual structural wood members with the necessary reliability. The research program was directed at evaluating the feasibility of utilizing a sonic wave NDE method to provide for cost-efficient, reliable determination of the strength of individual wood beams. A five-fold plan was adopted: (1) development of a preliminary model using NDE and destructive test data to predict the bending strength of wood beams; (2) development of a practical field test that allowed the collection of quality NDE data; (3) collection of NDE data from Douglas-fir joists in-situ and in the laboratory; (4) development of models to predict the bending strength of the joists; and (5) preliminary evaluation of the effects of in-situ conditions by comparison of NDE models based on in-situ and laboratory data. The results verified the validity of the sonic wave NDE approach.