著者

山田 有孝 永野 正行 山添 正稔 三浦 賢治

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.67, no.561, pp.73-80, 2002-11-30 (Released:2017-02-04)

参考文献数

20

被引用文献数

1 1

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The earthquake strong motion arrived from seismic fault via propagating in bedrock and local site. The adequate 3-dimentional dynamic analytical method is required in order to evaluate the seismic risk for the coming large earthquake. The development of computer technology makes it possible to carry out the dynamic analysis of huge 3-dimentional soil model. The finite element method (FEM) applied to space discrete and explicit method applied to time integration is useful. The FEM can represents soil irregularity more rigorous but expense longer computational time. This paper describes the method of FEM and explicit time integration considering multi volumes with variable mesh size and integral time increment. The proposed method demonstrates good computational performance for dynamic analyses of large 3-dimentional soil model. The prediction analyses for earthquake motions in Osaka area during hypothetical Tokai-Nankai earthquake is shown.

著者

安達 直人 鈴木 康嗣 三浦 賢治

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.69, no.578, pp.75-82, 2004

被引用文献数

5 2

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Shaking table tests were conducted for investigating the relation between the subgrade reaction acting on a pile and the soil response in the non-liquefied and the liquefied soil. The subgrade reaction in the non-liquefied and the liquefied soil is occurred almost simultaneously in proportion to the soil shear stress. Before the occurrence of the liquefaction, the subgrade reaction mainly acts on the piles as the reaction forces, and is correspondent to both the relative displacement of the free ground and the ground among piles. After the occurrence of the liquefaction, the subgrade reaction mainly acts on the piles as the external forces. The subgrade reaction is correspondent to the relative displacement of the ground among piles, and is less-related to that of free ground. Though there is a part of the subgrade reaction in proportion to the relative velocity of the ground among piles, this part is very small.

著者

泉 洋輔 三浦 賢治

出版者

一般社団法人日本建築学会

雑誌

日本建築学会技術報告集 (ISSN:13419463)

巻号頁・発行日

no.23, pp.91-96, 2006-06-20

被引用文献数

1

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In soil-structure interaction problem, dynamic impedance function and foundation input motion (FIM) is fundamental physical properties. We carried out an axisymmetric finite element method (AX-FEM) analysis to verify the accuracy of FIM between "Response and Limit Strength Calculation (RLSC)" and AX-FEM. The acceleration response spectrum (ARS) obtained by RLSC almost envelops those obtained by AX-FEM in the range of the whole periods. Therefore, it can be said that the evaluation of the embedding effect in RLSC is conservative, particularly in a short period range. Also, it is observed that the spectrum at the foundation bed of the free field computed by SHAKE is similar to FIM, but the former response is underestimated in specific period ranges. Furthermore, it is shown that presentation of the numerical tables of transfer function of FIM is useful in practical design through comparison ARS of multi-layered soil model with that of equivalent two-layered soil model by RLSC.