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タイトル: | Non-linear transient behavior during soil liquefaction based on re-evaluation of seismic records |
著者: | Kamagata, S. Takewaki, Izuru https://orcid.org/0000-0002-5673-2409 (unconfirmed) |
著者名の別形: | 竹脇, 出 |
キーワード: | Soil liquefaction Frequency-shift Pulse wave Cyclic mobility Non-stationary Fourier spectrum Maximum amplitude spectrum Frequency ratio of dominant components Deterioration ratio of soil stiffness |
発行日: | Apr-2015 |
出版者: | Elsevier Ltd. |
誌名: | Soil Dynamics and Earthquake Engineering |
巻: | 71 |
開始ページ: | 163 |
終了ページ: | 184 |
抄録: | Focusing on soil liquefaction, the seismic records during the Niigata-ken earthquake in 1964, the southern Hyogo prefecture earthquake in 1995 and the 2011 off the Pacific coast of Tohoku earthquake are analyzed by the non-stationary Fourier spectra. The shift of dominant frequency in the seismic record of Kawagishi-cho during the Niigata-ken earthquake is evaluated based on the time-variant property of dominant frequencies. The reduction ratio of the soil stiffness is evaluated from the shift ratio of dominant frequency. It is detected that the pulse wave in the transient process during the progressing liquefaction is composed of the primary mode and the secondary modes. Using the seismic records at the underground of Port Island during the southern Hyogo prefecture earthquake in 1995, the amplification of liquefaction is evaluated by comparing the maximum amplitude spectra of seismic records at GL 0 m and GL-83 m. The average shear strain of underground is calculated from the numerically integrated displacement profiles and the deterioration ratio of stiffness is evaluated from the G-γ relation. The amplification of liquefaction at Chiba bay area is evaluated by using the ratio of the maximum amplitude spectra of CHB024 and CHBH10 (Borehole) from the mainshock and the aftershock of the 2011 off the Pacific coast of Tohoku earthquake. |
著作権等: | © 2015 Elsevier Ltd. NOTICE: this is the author's version of a work that was accepted for publication in Soil Dynamics and Earthquake Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Soil Dynamics and Earthquake Engineering, 71, 2015, doi:10.1016/j.soildyn.2015.01.017 この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/196054 |
DOI(出版社版): | 10.1016/j.soildyn.2015.01.017 |
出現コレクション: | 学術雑誌掲載論文等 |
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