ABSTRACT
This paper presents the development of numerical models that represent the seismic response of an integrated structure-foundation system, with similar levels of sophistication used to represent the response of the structure and shallow foundations. By adopting this approach, variations in response across the structure and the foundation in three dimensions can be identified. A range of footing models and design methods were used to indicate the impact of the foundation model inclusion on the structural demands. Uplift or compressive non-linearity of one footing dissipates energy and reduces demands on the structure directly above, but in the context of a full structure-foundation system, it can also shift actions to other footings and increase demands in other parts of the structure. Uplift reduces overall foundation system stiffness, creating shifts of moment and shear in single footings and causing residual actions to develop in the structure at the end of excitation.
