Soil-Foundation-Structure Interaction SFSI

Extension of the DDM to Soil-Foundation-Structure-Interaction (SFSI) systems... 

For small deformations, that is, for serviceability design, this approach should be sufficiently accurate for most projects. Owing to soil nonlinearity and the complex interactions between the foundation soils and the structure foundation(s), additional considerations are required when soil movements or deformations are large, especially when structure foundations are subjected to kinematic forces. In such cases, apphcation of the simple decouphng methods is not likely to provide sufficiently rehable results, in particular for important structures. For important structures or complex situations, a detailed SFl or a soil-foundation-structure interaction (SFSI) analyses are usually required to estimate and be able to evaluate foundation movements more accurately. 

This computational imbalance motivated development of the Plastic Domain Decomposition (PDD) method described in this paper. Developed PDD is applied to a large scale seismic soil-foundation-structure (SFS) interaction problem for bridge systems. It is important to note that the detailed analysis of seismic SFSI described in this paper is made possible with the development of PDD as the modeling requirements (finite element mesh size) were such that sequential simulations were out of questions. 

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