Long-term Monitoring of Amplitude Dependent Dynamic Characteristics of a Damaged Building during the 2011 Tohoku Earthquake

Abstract

This paper describes the amplitude dependent dynamic characteristics of a 9 story building in Sendai before, during, and after the 2011 Tohoku earthquake. Dynamic hysteresis characteristics are investigated based on actual observation records. Occurrence of partial uplifting in the transverse direction is suggested by the induced higher harmonics based on the wavelet analysis. The suggested phenomena are consistent with the damage features. Historical change of the dynamic characteristics is also discussed based on the long-term monitoring data.