著者

長谷部 雅伸 大竹 健司 古村 孝志 木全 宏之 征矢 雅宏 石井 やよい 佐藤 俊明

出版者

公益社団法人 土木学会

雑誌

土木学会論文集B2(海岸工学) (ISSN:18842399)

巻号頁・発行日

vol.68, no.2, pp.I_166-I_170, 2012 (Released:2012-11-15)

参考文献数

6

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To understand the characteristics of tsunami propagation in the Seto Inland Sea, tsunami simulations for the largest earthquake on the Nankai trough were conducted. In this paper, we assumed three fault models with taking into account the latest findings after the 2011 earthquake off the Pacific coast of Tohoku. For the case of large fault slip along the plate boundary region, the tsunami height around the Seto Inland Sea was about the same as the value of the conventional assumption, because the tsunami components generated by the plate boundary regions were attenuated when passing through the straits. But we confirmed that the tsunami height around the Seto Inland Sea became higher in the case of delayed rupture with appropriate time lag, or in the another case that the fault region was expanded to north.

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

ファム バン フック 長谷部 雅伸 髙橋 郁夫

出版者

公益社団法人 土木学会

雑誌

土木学会論文集B2(海岸工学) (ISSN:18842399)

巻号頁・発行日

vol.68, no.2, pp.I_71-I_75, 2012 (Released:2012-11-15)

参考文献数

14

被引用文献数

6

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Sensitivity of turbulence models and grid resolution are investigated in the simulation of collapse of a water column by a three-dimensional tsunami analysis with VOF method in comparison with the previous experimental results. LES turbulence model is found as an effective model in simulation of tsunami wave run-up on shores. High mesh resolution or mesh refinement need to be adapted around walls to simulate the collision of tsunami wave on buildings and structures. The performance of the tsunami analysis is also confirmed in comparison with a tsunami run-up water tank test. A large-scale simulation is carried including a wide urban area with complex terrain. Local concentration of high wave height distribution in narrow steep terrain and inhibitory effect of buildings and structures on tsunami run-up have been found.