Variations in the natural frequency and damping coefficients with cyclic fatigue testing in steel and composite beams carrying a lumped mass are assessed. The identification of these parameters is performed by exploiting the nonlinear behavior of the beam-mass system and matching an approximate solution of the representative model with quantities obtained from spectral analysis of measured vibrations. Percentage variations of the identified parameters during the tests and up to the point where cracks were observed are determined. The results show that the damping is more sensitive to damage progression than the natural frequency.

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