2002 Fiscal Year Final Research Report Summary
Research on Liquefaction Judgment Criteria in Consideration of Characteristics of Input Earthquake Motion in Frequency Domain
| Project/Area Number |
11558049
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Natural disaster science
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| Research Institution | Ehime University |
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Principal Investigator |
MORI Shinichiro Ehime University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10304643)
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| Co-Investigator(Kenkyū-buntansha) |
HONDA Riki Kyoto University, Des.Prev.Res.Inst., Research Associate, 防災研究所, 助手 (60301248)
SAWADA Sumio Kyoto University, Des.Prev.Res.Inst., Associate Professor, 防災研究所, 助教授 (70187293)
MURO Tatsuro Ehime University, Faculty of Engineering, Professor, 工学部, 教授 (00025967)
YOSHIDA Nozomu Sato Kogyo, Technical Research Institute, Research Head, 中央技術研究所, 主任研究員
MORIKAWA Hitoshi Tokyo Institute of Technology, Associate Professor, 大学院・総合理工学研究科, 助教授 (60273463)
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| Project Period (FY) |
1999 – 2002
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| Keywords | Liquefaction judgment / Earthquake motion / Frequency characteristics / Torsional test / Liquefaction resistance / Cumulative damage index / Geiyo earthquake / Western Tottori earthquake |
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| Research Abstract |
The objective of this research was develop a new liquefaction judgment criteria in consideration of characteristics of input earthquake motion in frequency domain. For this objective, site investigations in actual earthquake-induced liquefaction during 2000 Western Tottori earthquake and 2001 Geiyo earthquake, case studies of actual liquefaction and ground motion records influenced by that, modeling frequency characteristics of earthquake input motion, studies of dominant frequency in liquefaction occurrence by numerical analyses, and experimental studies on influence on liquefaction characteristics by additional frequency components through a newly manufactured hollow torsional shear apparatus were carried out. Research results are summarized as follows : Components of natural frequency of surface ground dominate in shear strain of ground amplified by nonlinear behavior including liquefaction. Additional high frequency components promote pore pressure generation and shear strain after initial liquefaction. Such promoting effects can be estimated by traditional cumulative damage theory.
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[Publications] Nishikawa, J., Hayashi, H., Egawa, T., Miwa, S., Ikeda, T. and Mori, S.: "Liquefaction array observations at two sites and analysis of their records"Journal of Japan Society Civil Engineers. No.703/I-59. 327-343 (2002)
Description
「研究成果報告書概要(欧文)」より
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