CHANGE IN DYNAMIC CHARACTERISTICS OF SUPER HIGH-RISE BUILDINGS DUE TO THE 2011 GREAT EAST JAPAN EARTHQUAKE

Abstract

Change in dynamic characteristics of ten super high-rise buildings during the 2011 Great East Japan Earthquake was investigated through the analyses of strong motion data.
The natural periods of two RC buildings obviously increased during the earthquake, and were not recovered after the shaking. On the other hand, change of the natural periods of eight steel buildings was extremely small.
Amplitude dependency of the natural periods of the two buildings was examined. The dependency of the natural periods to the response amplitudes was clearly recognized and the trends were different between before and after the Great East Japan earthquake.