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Abstract
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Rate-dependent behavior prediction of soils under non-monotonic complex loading paths necessitates considering more elaborated mathematical formulations. In this study, an existing elastoplastic-viscoplastic constitutive model has been upgraded based on recent experimental observations. The two mechanisms of elastoplastic and viscoplastic were coupled based on their kinematic hardening rules. Then, the developed model was implemented in ABAQUS code, via UMAT and VUMAT subroutines and validated based on experimental results obtained from laboratory tests. The results of validation indicate a good capacity of the model in describing diverse time-depending aspects such as creep, relaxation, and rate effects during applying complex loading paths
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