Modeling of Nonlinear Soil-Foundation-Structure Interaction in Response History Analysis - An Existing-Building Evaluation Case Study

摘要

An appropriate characterization of the spatial distribution of flexibility and strength in the foundation system is critical to achieving an accurate quantification of the distribution of deformation and energy dissipation in the seismic response an existing building supported on flexible foundations. By definition, simplified foundation-modeling assumptions, such as those in ASCE 41, are not directly applicable to hybrid foundation systems or systems with irregularities. For example, this issue is of importance in the case of an existing building where flexibility and inelasticity can be attributed to both the embedded foundation elements and to the supporting soil, with variability in plan and in depth, as well as in the superstructure. This paper will address an existing-building-evaluation case study where the general guidelines for shallow foundations provided in ASCE 41 were extended to include additional theoretical solutions and modeling assumptions, as recommended in the document. Of particular interest in the model is the treatment of the foundation system as a global Winkler-type foundation system rather than individual supports.