Seismic Structural Damage Detection Based on Time Frequency Response Function
Considering that Hilbert-Huang Transformation (HHT) can be used to analyze instantaneous frequency in structural dynamic analysis, this paper proposes the concept of HHT marginal spectrum based time frequency response function. It also defines “central frequency”, which is used to reflect the change of structural dynamic properties during earthquakes, and discloses time-varying development of seismic structural damage. Using a three-story shear frame model, which is subjected to the El Centro seismic wave, the HHT time frequency response analysis of its acceleration response has been made, results show that the adoption of central frequency can successfully indicate the damage inception instant and its development.
Helen Zhang, Gang Shen and David Jin
B. S. Wang et al., "Seismic Structural Damage Detection Based on Time Frequency Response Function", Advanced Materials Research, Vols. 219-220, pp. 243-249, 2011