Analytical and experimental assessment of degrading structures dynamic behavior
Journal Title: Romanian Journal of Acoustics and Vibration - Year 2012, Vol 9, Issue 1
Abstract
The paper presents an inverse method for time dependence identification of equivalent stiffness and damping coefficients of a SDOF oscillating system with degrading hysteretic behavior. The method is based on forced and free vibration laboratory experiments conducted on a cantilever drywall beam with a concentrated mass placed on its free end. The experimental results show an important amplification of the output vibration level due to the stiffness degradation when the driving frequency is slightly lower than the first vibration mode frequency of non-degraded structure. The relatively short time interval for system entering the resonance frequency due to its stiffness degradation outlines a drawback of structural design allowing the occurrence of plastic hinges as seismic building self-protection, particularly in the case of seismic motions with low frequency dominant spectral components (“slow earthquakes”).
Authors and Affiliations
Tudor SIRETEANU, Ana-Maria MITU, Claudia MEGLEA
Keywords
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