Dynamic Behaviour of a Museum Building Retrofitted Using Base Isolation System

Abstract eng:
The main building of the National Museum of Western Art (NMWA), Japan, is a historic building completed in 1959. To improve the seismic performance of the NMWA main building with preserving the artistic value, the base isolation system was adopted as a retrofitting method. The Building Research Institute (BRI) of Japan started strong motion observation targeted on the NMWA main building in 1999 in order to examine the performance of the base isolation system. The observation system has six tri-axial acceleration sensors in the building and on the ground. A number of valuable strong motion records have been accumulated since. Firstly, this paper introduces the strong motion observation system installed in the NMWA main building. Secondly, dynamic behaviour of the base isolated building is discussed by means of Fourier spectrum analyses for the strong motion record from an earthquake with the peak ground acceleration of about 0.1G. Finally, natural frequencies and damping ratios assuming a single-degree-of-freedom system are identified using 101 strong motion records. The dependence of natural frequencies upon displacements of the base isolation system can be clearly recognised through the analysis. Stable damping ratios that are independent of displacements of base isolation devices are also observed.

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