In bridge design use of integrated models for analysing of substructure (including foundation) and subsoil together with superstructure is quite rare, a separated approach using two interconnected models is more often. In this paper we present methods to use in structural modeling for modeling substructure, foundation and soil with emphasis on piles. In the simplest method prescribed displacements are applied on rigid supports to represent all the effects of pile foundation and surrounding soil. An advanced approach is the use of springs for modelling their complex response. Some designers include the piles in the superstructure model too, and require spring parameters for modeling the soil beside each pile element. We present how to determine spring characteristics for these approaches based on traditional analytical geotechnical consideration or force-displament curves measured or simulated. Another probably a better way could be to represent the entire support response in the superstructure modeling, especially in the case of abutments. The complex interactions can be analysed only by advanced geotechnical FEM modeling and the results can be used for deriving of simplified spring parameters as shown in this paper.