Seismic Retrofitting of Traditional Wooden Temple Using Base Isolation

Abstract eng:
This paper focuses firstly on the dynamic characteristics and the structural performance of Yutenji Shoin, which is a traditional wooden building; secondly on analysis modeling of such traditional structures; and lastly on improvement in earthquake-resistant capability through seismic retrofitting for the temple. In Japan, earthquake damages on traditional timber building are standing due instead of new buildings following new building codes. Yutenji Shoin was constructed as a single-story traditional wooden-frame assembly house at Yutenji Temple 110 years ago. The inferior features of the building were the insufficient earth walls which were main seismic resistant elements; the large space supported by only pillars with hanging walls; soft lateral frame in the roof plane; independent footing with foundation stones. Although in order to keep and inherit the historical structure, evaluation and continuous use of the old-style structural elements were emphasized as the design concept of the seismic retrofitting project for Yutenji Shoin. As a result, a base isolation system consisting of linear sliders, layered rubbers, and oil dampers were added between the newly constructed slab and the base mat. The roof and the walls were reinforced to achieve enough strength for the superstructure. These elements were all included in the structural analysis model. Finally, earthquake-resistant capability was examined through dynamic response analyses.

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