Jean Carlos Cardozo da Silva, Cicero Martelli, Elisabeth Penner, Hypolito José Kalinowski


A low noise fiber Bragg grating (FBG) measurement system is used to study the glue laminated timber degradation with different techniques of modal analysis. Two glue- laminated timbers are instrumented with a FBG sensor and the results are compared with two other commercially available sensors: strain gage and accelerometer. The load of rupture of each beam is determined by measuring their natural frequency peak that can be related to the strength reduction of the material by a quality factor of the resonance spectra as a function of the load.

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