Assessing nonlinear soil behavior using vertical array data: a case at TCGH16 station from KiK-Net in Japan

MIAO Yu 1 SHI Yang 1 WANG Suyang2 WANG Haiyun 2

(1.School of Civil Engineering and Mechanics, Huazhong University of Science and Technology , Wuhan, China 430074)
(2.Institute of Engineering Mechanics, China Earthquake Administration, Harbin, Heilongjiang, China 150081)

【Abstract】In this study, we analyzed acceleration time histories data at TCGH16 vertical array in Japan, which were recorded between January 2009 to June 2014, to evaluate nonlinear soil mass behavior. Ground motion records provided by seismic vertical arrays allow estimation of in-situ soil dynamics parameters. Using classic hyperbolic models, we quantitatively assessed the relationships between the soil dynamics parameters and level of ground motion. We found that the nonlinearity starts at a quite low level of strain of 2 × 10–5 and becomes much more significant beyond a relative high level of strain of 1 × 10–4. The threshold strains from ground motion observations are well consistent with those from previous laboratory tests. When PGA comes to 100, 200, 400 and 800 cm/s2, the equivalent shear modulus is decreased about 5%, 11%, 22% and 42%, respectively. Finally, we inferred that the threshold acceleration for nonlinear response at TCGH16 array is about 40 cm/s2, which indicates clearly that nonlinear site response may occur in ground motions with a moderate intensity.

【Keywords】 vertical array; site response; constitutive relation; shear modulus ratio curves; seismic interferometry;

【DOI】

【Funds】 National Natural Science Foundation of China (41372335, 51778260)

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(Translated by CHEN L)

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This Article

ISSN:1004-4574

CN: 23-1324/X

Vol 27, No. 06, Pages 51-58

December 2018

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Article Outline

Abstract

  • 1 Site conditions and seismic records
  • 2 Methods
  • 3 Results and analyses
  • 4 Conclusions
  • References