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Nonlinear behaviour of scoria soil sediments evaluated from borehole records in eastern Shizuoka prefecture, Japan
Author(s) -
Satoh Toshimi,
Horike Masanori,
Takeuchi Yoshihiro,
Uetake Tomiichi,
Suzuki Hideyo
Publication year - 1997
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/(sici)1096-9845(199708)26:8<781::aid-eqe676>3.0.co;2-s
Subject(s) - borehole , shear (geology) , geology , damping ratio , shear modulus , geotechnical engineering , nonlinear system , seismology , residual , spectral acceleration , ground motion , peak ground acceleration , physics , mathematics , vibration , acoustics , quantum mechanics , petrology , algorithm , thermodynamics
We evaluate the non‐linear behaviour of soil sediments, analysing five weak and four strong motions observed at depths of 1 m and 28 m, in eastern Shizuoka prefecture, Japan. We identify S‐wave velocities and frequency‐dependent damping factors by minimizing the residual between observed and theoretical spectral ratios, based on a linear one‐dimensional model. We find that S‐wave velocities identified from strong motions, whose peak ground acceleration are 440, 210, 176, and 140 cm/s 2 , are significantly smaller than those identified from weak motions. The shear modulus reduction ratios estimated from identified S‐wave velocities become clear above an effective shear strain of 10 ‐4 and agree with laboratory test results below an effective shear strain of 8×10 ‐4 . The differences of damping factors between weak and strong motions are not clear below this effective shear strain, as the laboratory test suggested. The equivalent linear one‐dimensional model, with frequency‐dependent damping factors, is confirmed to be valid to simulate strong motions at least an effective shear strain of less than 4×10 ‐4 . © 1997 John Wiley & Sons, Ltd.