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Appl. Sci. 2017, 7(11), 1110; https://doi.org/10.3390/app7111110

Soil Dynamic Constitutive Model for Characterizing the Nonlinear-Hysteretic Response

High Speed Railroad Systems Research Center, Korea Railroad Research Institute, 176, Cheoldo bangmulgwan-ro, Uiwang-si, Gyeonggi-do 437-757, Korea
Received: 6 October 2017 / Revised: 24 October 2017 / Accepted: 24 October 2017 / Published: 27 October 2017
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Abstract

Characterization of nonlinear hysteretic responses plays a significant role in predicting soil behaviors. They are mostly described with either simple empirical functions or complex constitutive models. However, the input parameters lack both a physical basis and robustness, and the use of these models is limited to some typical soils. Therefore, there is a need for a simple but robust model that uses only a small number of physically meaningful parameters. This study proposes explicit formulas to capture different nonlinear hysteretic soil responses, including a constitutive model, backbone curve, tangent shear modulus, secant shear modulus, and damping ratio. In particular, the Davidenkov model, with two physically meaningful parameters, is adopted to assess the constitutive relationships of soils under steady-state cyclic loading. The proposed models are validated with resonant column test (RCT) data (shear modulus and damping ratio). This paper finds that the use of the linear characteristic equation to calculate the shear modulus from the resonance frequency in the RCT, which is clearly irrelevant and approximate, produces data interpretation errors. View Full-Text
Keywords: nonlinear hysteretic response; Davidenkov model; backbone curve; tangent shear modulus; secant shear modulus; damping ratio; resonant column test nonlinear hysteretic response; Davidenkov model; backbone curve; tangent shear modulus; secant shear modulus; damping ratio; resonant column test
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Chong, S.-H. Soil Dynamic Constitutive Model for Characterizing the Nonlinear-Hysteretic Response. Appl. Sci. 2017, 7, 1110.

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