The objective of the health monitoring of
building using seismic interferometry is to clarify the reliability and
effectiveness of the deconvolution interferometry to recognize and to identify
damages in buildings due to the loss of stiffness after earthquakes to mitigate
disaster risk. Therefore, the analysis procedure has been divided into three
cases. Case A is the study of the technique validation by visual inspection of
the annex BRI building suffered from the Great East Japan Earthquake. Case B
illustrates the applicability to Sakishima Office high-rise Building to detect
damages and shear stiffness estimation. Case C indicates the evaluation of the
sloshing effect into the experimental wooden sixth-story building.
The methodology demonstrated
here, provides the analysis of strong motion and ambient vibration data to
evaluate the dynamic properties of the building in the time periods before,
during and after the quake to estimate damages and loss of shear stiffness,
using system identification as a tool for seismic interferometry. Moreover, to
assess the changes in the dynamic parameters due to the sloshing water effect.
By comparison of
the results in the time periods before and after the quake, using ambient
vibration, the shear wave velocity degradation located in each floor is
assessed. The overall tendency on Case A indicates the dependency of the shear
wave velocity degradation with the width of cracks. Case B shows the well
estimation of shear stiffness and dependence of its accurateness due to the
number of sensors. Case C shows that seismic interferometry is a suitable
technique and has high sensitivity to evaluate the wave patterns to estimate
the sloshing effect.
Keywords: Health Monitoring, System Identification, Seismic Interferometry,
Sloshing Effect.