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

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

2008-03-12

arxiv.org/abs/0803.1779v1

Structural Health Monitoring 9, 2 (2010) 159-171

Physics

Geophysics

Scientific paper

10.1177/1475921709352146

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

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