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    FACT NIKKEN SEKKEI37are not particularly effective against lateral swaying, such as that generated by earthquakes. However, timber frames with tradition-al joint architecture consistently resist large deformations due to their flexibility and the unique property of compressive strain achieved with the artful use of wood. Using a variety of experi-ments, we test the aseismic capacity of each building by properly evaluating flexibility. We introduce further safety improvements based on the nature of each building and implement aseismic rein-forcement improvements in keeping with historical design.The 110 year-old Goeido of Higashi Honganji Temple is the world's largest wooden building. A tiled roof of over 8,000 m² is supported by giant roof trussesa structure that imposes a tre-mendous weight on the wooden frame. Therefore, we had to care-fully examine the aseismic capacity of the structure. We adopted reinforcement approaches that would not decrease the deforma-tion-resistant capacity of the traditional wooden building, such as ladder-structured timber beams and dry earth-wall panels. The restoration work, which involves design that reflects these sophis-ticated concepts, is being carried out in cooperation with the Disaster Prevention Research Institute of Kyoto University. Helping to Preserve Japan's Cultural LegacyIn enhancing the earthquake security of traditional buildings, we are required to protect their historical value as cultural properties while also maintaining their beautiful design features. Traditional wooden structures, built in their original frame styles, require us to apply technologies that are completely different from the modern design approaches applicable to contemporary buildings. We aim to realize further achievements in this area in order to make a sig-nificant contribution to the preservation and development of Japa-nese culture.Tomio Oono, Yasuhiko Tashiro, Takao Nishizawa Goeido at Higashi Honganji Temple8,000m2Aseismic capacity was examined for the giant roof trusses that support the tiled roof (over 8,000 m2) of Goeido. Kondo at Suo Kokubunji Temple : : : : : 12,891.98 : 200812Restoration of Goeido(Founder's Hall), Higashi Honganji TempleCilent: Shinshu Otani-haLocation: Kyoto, JapanMajor functions: Religious structureStructuer: WNumber of oors: +1Total oor area: 2,891.98 m2Completion: Dec.2008

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