Seismic Retrofit of Existing 256m High Building By Installing Seismic Dampers To Cope With Long Period Earthquake Ground Motions

Abstract eng:
Long period earthquake motion was observed at 52-story steel-framed building located in the Osaka Bay area when Great East Japan Earthquake occurred in 2011 although the site of the high-rise building is 770 km away from epicenter. This paper deals with authors’ elaborated seismic retrofitting design of the high-rise building to provide for future great quake such as Nankai megathrust earthquakes. To obtain strength and stiffness, steel dampers were installed in the long direction frames and to reduce the shaking of the building, oil dampers were installed in the short direction frames. After retrofitting, vibration test was conducted, of which results shows that damping ratio in the short direction has increased to more than double in virtue of the oil dampers added. Dynamic analysis results show that the maximum and the cumulative displacements on the 51st floor reduced remarkably. The test and analysis results of the first-stage seismic retrofitting verifies satisfactory effects of the damping system.

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