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タイトル: 33. 1983年日本海中部地震による建築構造物の被害について
その他のタイトル: 33. On the Damage to Buildings Caused by the Nihonkai-Chubu Earthquake of 1983
著者: 田守, 伸一郎
大沢, 胖
著者(別言語): Tamori, Shinichiro
Osawa, Yutaka
発行日: 1984年1月14日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第58冊第3号, 1984.1.14, pp. 735-747
抄録: The Nihonkai-Chubu Earthquake (M=7.7) occurred on May 26, 1983. This earthquake caused severe damage to many buildings, mostly in Akita and Aomori prefectures. This is a report on a visual survey of damage to buildings in the main part of affected area. The feature of the damage to buildings is the fact that most of it was caused by ground deformation due to liquefaction. In this area, wooden houses have very light roofs made of galvanized sheet iron. So, even when a house suffered severe damage, it rarely fell down. The districts where buildings were heavily damaged by such ground deformation as sliding and subsidence are Arayamoto-machi and Arayamatsumi-cho in Akita city, Wakimoto in Oga city, Wakami-cho, Hachiru-cho, Noshiro city, all of which are in Akita prefecture, and Shariki-mura and Azigasawa-cho in Aomori prefecture. Damage to expansion joints in reinforced concrete buildings was widespread in the affected district. The Noshiro Shogyo High School buildings were some of those a most severely damaged by the earthquake. Two buildings of the school are of 4-story reinforced concrete structure and two gymnasiums are of 1-story steel structure, and the buildings and gymnasiums stand on very soft sand ground, so the two reinforced concrete buildings are supported by piles. The heaviest damage occurred at the expansion joint portion of the passage between the two reinforced concrete buildings. The connected portion was separated from each other by 9 cm and slid 15 cm apart on the 4th floor. Simlar damage also occurred at the connected portion of the passage between the gymnasium and the reinforced concrete building. There were also heavy cracks and traces of the sand emission due to liquefaction on the school ground and the two septic tanks were buoyed up by this phenomenon. The damage to buildings caused by this earthquake gives important lessons for earthquake resistant design of buildings including wooden houses, reinforced concrete structures and others. It is important to consider the planning of a building fundation and the investigation of the dynamic behavior of soils where the ground is apt to be liquefied.
URI: http://hdl.handle.net/2261/12898
ISSN: 00408972


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