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Different soils show different nonlinear stress-strain patterns. Hence, it is difficult
to come up with a general model to predict these shapes. This study investigated the
suitability of the DHI model which was not originally formulated for geomaterials. This
model was applied to different loading cycles of various types of soils and the model.s
variables were optimized using nonlinear generalized reduced gradient (GRG) method. Up to
five hysteresis springs were considered in the study. The computed error criteria indicated that
the DHI model approximated the nonlinear hysteresis shapes appropriately and using three
hysteresis springs presented the best estimation for almost all cases. In addition, this model
approximated the initial loading cycles better than the final ones.
Keywords: cyclic direct simple shear (CDSS) test, DHI model, dynamic loading, nonlinear plasticity, optimization, soil modeling |
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