Damage Detection of Wood Beams Using the Modal Flexibility Curvatures

Chuan Shuang Hu; Wei Wen; Hong Yun

doi:10.4028/www.scientific.net/AMR.538-541.1815

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 538-541Damage Detection of Wood Beams Using the Modal...

Damage Detection of Wood Beams Using the Modal Flexibility Curvatures

Abstract:

Local damages such as knots, decay, and cracks can be translated into a reduction of service life due to mechanical and environmental loadings. In wood construction, it is very important to evaluate the weakest location and detect damage at the earliest possible stage to avoid the future catastrophic failure. In this study, modal testing was conducted on wood beams to generate the first two mode shapes. A novel statistical algorithm was proposed to extract the damage indicator by computing the modal flexibility curvature before and after damage in timbers. Different damage severities, damage locations, and double damages were simulated by removing mass from intact beams to verify the algorithm. The results have shown that the proposed statistical algorithm is effective and suitable to the designed damage scenarios. The proposed algorithm can qualitatively identify the damage existence and its location although there is no linear correlation between damage indicators and damage severities. The peak values of the damage indicators increase when the losses of the second axial moment of area increases. It is also reliable to detect multiple damages.