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The analysis of strong motion recordings in structures is crucial tounderstand the damaging process during earthquakes. A very precisetime-frequency representation, the reassigned smoothed pseudo-Wigner-Villemethod, allowed us to follow the variation of the Millikan Library (California)and the Grenoble City Hall building (France) resonance frequencies duringearthquakes. Under strong motions, a quick frequency drop, attributed to damageof the soil-structure system, followed by a slower increase is found. However,in the case of weak earthquakes, we show that frequency variations come fromthe ground motion spectrum and cannot be interpreted in terms of change of thesoil-structure system.

Time-frequency analysis of Transitory/Permanent frequency decrease in civil engineering structures during earthquakes