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 nine-story building in Sendai before, during, and after the 2011 Tohoku earthquake. The dynamic hysteresis characteristics are investigated using actual observations. Findings on induced higher harmonics on the basis of wavelet analysis suggest partial uplifting in the transverse direction. These features are consistent with the damage. Using long-term monitoring data from micro to strong motions in the building (40 years since its completion), the historical changes in the dynamic characteristics are also explored.