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ID 58574
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Title Alternative
Computation of non-linear site response by the time-domain finite-difference method
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Author
TORIGOE, Yusuke Department of Earth Sciences, Faculty of Science, Okayama University
KOMATSU, Masanao Graduate School of Natural Science and Technology, Okayama University
TAKENAKA, Hiroshi Graduate School of Natural Science and Technology, Okayama University Kaken ID researchmap
Abstract
We have developed a time-domain staggered-grid finite-difference code for modeling non-linear response of a one-dimensionally inhomogeneous subsurface structure to a SH plane-wave incidence. It employs the velocity-stress formulation of elastodynamic equation for the linear part, and adopts a elastoplastic rheology model for the non-linear relation between the stress and strain. In this paper, we apply this code to four constitutive models from linear-elastic to nonlinear: (1) linear elastic model, (2) linear viscoelastic model, (3) elastoplastic model, and (4) viscoelastoplastic model, which simulate shallow sand and clay structures and are vibrated by a vertically incident SH plane-wave of Ricker wavelet, to compare the linear and the non-linear soil behaviors including low strains damping (viscoelastic effect) and/or hysteretic attenuation (non-linear effect). We also apply it to a local strong-motion record of the 2000 Western-Tottori earthquake (MW6.8). We then simulate characteristics of non-linear site response such as reduction of the spectral amplitude in the high frequency band and shift of the peak frequencies to lower frequencies.
Keywords
finite-difference method
non-linear site response
strong motion
Publication Title
Okayama University Earth Science Report
Published Date
2019-12-27
Volume
volume26
Issue
issue1
Publisher
岡山大学理学部地球科学教室
Publisher Alternative
Department of Earth Sciences, Faculty of Science, Okayama University
Start Page
1
End Page
17
ISSN
1340-7414
NCID
AN10506284
Content Type
Departmental Bulletin Paper
OAI-PMH Set
岡山大学
language
日本語
Copyright Holders
© 2019 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
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Eprints Journal Name
esr