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https://hdl.handle.net/20.500.14094/90007170
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2024-04-26
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90007170 (fulltext)
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メタデータID
90007170
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open access
出版タイプ
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タイトル
An Experimental Study on the Way Bottom Widening of Pier Foundations Affects Seismic Resistance
著者
著者ID
A1282
研究者ID
1000030356042
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=b15824d8a2fe1c3d520e17560c007669
著者名
Nagao, Takashi
長尾, 毅
ナガオ, タカシ
所属機関名
都市安全研究センター
収録物名
Engineering, Technology & Applied Science Research
巻(号)
10(3)
ページ
5713-5718
出版者
Engineering, Technology & Applied Science Research (ETASR)
刊行日
2020-06
公開日
2020-07-02
抄録
The resistance of a pier to horizontal loads, like seismic loads, is due to the flexural rigidity of its foundations and the horizontal subgrade reaction. In the event of a massive earthquake, the latter becomes very small because of the softening of the ground, while the structure may experience a large inertia force and lateral spreading pressure. Therefore, structures with high seismic resistance are required in areas with high seismicity. When a wide caisson is used as a pier foundation, a rotational resistance moment caused by the vertical subgrade reaction acting on the foundation bottom can be expected. Although this rotational resistance moment increases if the foundation is widened, in design practice the subgrade reaction coefficient is evaluated as being low under such circumstances. Therefore, even if the foundation is widened, the rotational resistance moment does not increase greatly. Rotational resistance commensurate with the increased construction cost due to foundation widening cannot be expected. In the present study, horizontal loading experiments were performed at one pier with a normal foundation and at one with widened at the bottom foundation, and the way that the widening affected the seismic performance was examined. The results show that compared with the normal foundation, the bottom-widened one experienced far less displacement and offered higher earthquake resistance.
キーワード
earthquake resistance
subgrade reaction
pier
displacement
カテゴリ
都市安全研究センター
学術雑誌論文
権利
© 2020 Author.
This work is licensed under a Creative Commons Attribution 4.0 International License.
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資源タイプ
journal article
言語
English (英語)
ISSN
2241-4487
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eISSN
1792-8036
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URI
https://www.etasr.com/index.php/ETASR/article/view/3590
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