著者

濁川 直寛 浅香 美治 長谷部 雅伸

出版者

日本建築学会

雑誌

日本建築学会技術報告集 (ISSN:13419463)

巻号頁・発行日

vol.23, no.55, pp.851-856, 2017

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A simple seismic isolation system by leveraging buoyancy has been devised for spread foundation structures. Through dynamic centrifuge tests, it is shown experimentally that a sliding isolation effect arises during seismic loading if a buoyant force of appropriate magnitude is applied to the base of the foundation. It is confirmed that seismic isolation performance tends to improve as the buoyancy-to-weight ratio increases. Performance when the buoyancy-to-weight ratio is 90% or more is particularly good, and the maximum response acceleration of a structure can be reduced to below 100 cm/s² against a sinusoidal wave with a maximum acceleration of 500 cm/s².

著者

時松 孝次 新井 洋 浅香 美治

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.62, no.491, pp.37-45, 1997

被引用文献数

12 3

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Microtremor measurements are conducted in the Sumiyoshi area, Kobe city, using array of sensors together with conventional measurements using one station. The F-k and H/V spectral analyses of micro-tremors result in two-dimensional shear wave structure down to the bedrock. The distribution of peak ground motions during the 1995 Hyogoken-Nanbu earthquake is then estimated using one-dimensional effective stress analyses. The estimated values in the heavily damaged area are larger than those in the other area, indicating that one-dimensional site amplification characteristics had a significant effect on the damage distribution of buildings.