Simulation Analysis of Response of Seismic Isolated Tsutenkaku Tower during the 2018 Osaka North Earthquake

Abstract

Seismic isolation retrofitting was conducted for Tsutenkaku tower of Osaka in 2015. The seismic isolation devices were installed at a height of about 9.5m above the ground. In this study, microtremor measurement and earthquake observation were carried out to investigate the earthquake response characteristic before and after the seismic isolation retrofit. The 2013 Awaji Earthquake and the 2018 Osaka North Earthquake were observed at both the basement and the roof floor. Simulation analyses of these earthquakes were made to discuss responses by the effect of seismic isolation retrofit.