New Horizons in Structural Design April, 2008

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36FACT　NIKKEN SEKKEI　　　　構造デザインの最前線Nikken Sekkei has achieved notable success with aseismic design technologies developed over many years, making advanced evalu-ation of seismic capacity and aseismic reinforcement improvements possible. Nikken Sekkei has helped to preserve and protect a num-ber of traditional wooden temples and shrines, as well as noted masterpieces of modern architecture.Earthquake Protection for Cultural LandmarksThe Main Building of the Aichi Prefectural Government, built in the Teikan (Imperial Crown) style, is designated as a key shelter in the event of disaster The structure still functions as a government office building, even though it is registered as an important cul-tural property. Therefore, we gave top priority to enhancement of its aseismic capacity as a seismic-isolated building able to resist the effects of massive earthquakes while also taking its historical importance into account.In planning this project, we specified several columns that would be collectively supported by a single seismic isolation mem-ber in order to give the upper structure a natural period of four seconds—an extremely long cycle for this kind of structure. Large, rectangular foundation frames were deployed for the upper struc-ture, so that the building would be able to sway slowly and stably. This allows the building to resist large-scale earthquakes without any compromise of design integrity or the building's value as a cultural property which is particularly notable in the upper portion of the building. Opening an Aseismic Future for Traditional Structures Nikken Sekkei has been involved in examination and reinforcement design for traditional wooden structures that often have great his-torical value such as the Kondo of Suo Kokubunji Temple and the Main Building of Kokuzenji Temple. Some traditional timber frames 立教大学礼拝堂。レンガ造建物として、日本で初めての免震レトロフィット工法による耐震補強。The Chapel of Rikkyo University saw the rst use of seismic isola-tion retrofitting technology for a brick structure in Japan.国立国会図書館「国際子ども図書館」。旧建物の構造と空間を可能な限り活かしながら、耐震性を高めるため、レトロフィット工法を採用。基礎下に免震層を設けて地震力を吸収する。International Library of Children’s Literature in Ueno: Seismic isola-tion retrofitting technology was used to maintain the existing structure.Main Building of Aichi Prefectural Government and Goeido of Higashi Honganji Temple愛知県庁本庁舎&東本願寺 真宗本廟 御影堂伝統建築の歴史的価値と耐震性能の調和Historical Design and Seismic Reinforcement: Maintaining a Balance

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