Experimental Evaluation of Modal Parameter Variations for Structural Health Monitoring

Abstract eng:
The article presents magnitudes variations of the modal parameters of a structure-soil system using modern systems identification techniques. In this building a local instrumental network has recorded more than twenty small and moderate seismic events with different usage conditions and structural and non—structural modifications since 1995; in addition, several ambient vibration records have been obtain, one of them with a duration of 7 months (continuous), to estimate modal variations due to weather, usage and seismic conditions. To evaluate these properties, parametric and non-parametric identification techniques are used. For the ambient records the methods used are spectral values and stochastic subspace identification technique. For seismic recording, parametric techniques are used such as MIMO’s technique developed by S. T. Mau. With the help of these studies, ranges for predominant frequency variation are on the order of 4% for ambient vibrations and moderate earthquake events that do not produce any damage in the structure. The predominant frequency variation observed are highly dependant on ambient conditions specially rain and temperature. The results obtained are an important indicator of non damage variations of predominant frequency for Health Monitoring Studies.

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