Abstract Database

HEALTH MONITORING OF BUILDING USING SEISMIC INTERFEROMETRY

MEE17707
ALVAREZ REYES Ronald Stephan
Supervisor: Toshihide KASHIMA
Country: Chile
Abstractfulltext

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.