Liquefaction Analysis Using Viscoplastic Kinematic Hardening Constitutive Model |
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| Authors: | T Tanaka and K Okajima |
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| Institution: | (1) Department of Biological & Environmental Engineering, University of Tokyo, Bunkyo-ku 1-1-1, Tokyo, Japan |
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| Abstract: | The dynamic response analysis combined with the generalized return-mapping algorithm is applied to the integration algorithms
of viscoplastic constitutive relations including the effect of the shear band. The kinematic hardening model based on modified
and extended soil model with isotropic strain-hardening–softening is employed. In this paper, the TESRA (temporary effect
of strain rate and acceleration) model is employed for the nonlinear viscosity of sand. The constitutive equations of rate-dependent
plasticity originally proposed by Duvaut–Lions are employed as the base of the solutions. Liquefaction of a buried pipe is
analyzed by finite element method by employing the above mentioned constitutive relations and the calculated results are compared
with experimental results. The dynamic response analysis is applied to the solutions of the problems. The kinematic hardening–softening
viscoplastic constitutive relations for geomaterials are promising for the predictions of cumulative deformations and liquefaction
of the buried pipe. A great deal of experimental results indicate that the stress is a unique function of irreversible strain
and its rate. |
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