SANISAND-MS (Liu et al., 2019) is a bounding surface plasticity constitutive model particularly suitable for reproducing the drained mechanical response of sands in high-cyclic loading conditions. The memory surface incorporated in the framework of SANISAND04 (Dafalias and Manzari 2004) has been proven to be a key element of the analytical formulation that enables the SANISAND-MS to capture the fabric-related effects on the accumulation of permanent strains (ratcheting) and stiffness evolution observed in high-cyclic laboratory tests. 

The model can be used to assess the monopile lateral capacity under monotonic loads and the tilting accumulated under a large number of cyclic lateral loads. While originally formulated for use in the field of offshore engineering, this model has potential applications in other engineering problems where the assessment of permanent strains induced by cyclic loads is relevant. An example can be the evaluation of the settlements of foundations caused by high-speed traffic loads, machine vibrations, and other sources of cyclic loads. The model implemented in PLAXIS 3D is a valuable tool for understanding soil-structure interaction and may provide benchmarks for validating different design methods of offshore foundations. 

The SANISAND-MS is introduced in PLAXIS 2023.2

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