Seismic Isolation Retrofit for Major Tall Building

Abstract eng:
The main building of the Aichi Prefectural Government, designated as a national registered cultural asset, and is also an important facility as a disaster prevention base in case of a disaster. Investigations and diagnoses conducted until 2002 revealed that the main building was lacking in seismic performance. In selecting a seismic retrofit method, it is necessary to analyze the characteristics of the main building, including its functions and value as a cultural asset, and carefully compare and examine methods. However, there has been no report about in-depth comparisons and examination of seismic retrofit methods. Additionally, the main building is located in a district requiring measures for disaster prevention in the giant Tokai and Tonankai Earthquakes that are said to occur in the near future. Although these giant earthquakes are expected to produce long-continued earthquake motions with amplified earthquake motion long-period components and cause damage to buildings of long-period structures, such as skyscrapers and base-isolated buildings, much consideration has not been given to this issue. In 2003, we selected seismic retrofit as the optimum work method in consequence of scrutiny of the main building’s characteristics and careful and objective comparisons and examination of methods in cooperation with academic experts. In 2004, we and experts jointly examined the main building using simulated earthquake motions created from the latest knowledge and data, which makes the main building a highly earthquake-resisting structure. This paper is a report of what we examined and designed in cooperation with these academic experts.

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