A Reduced Order Model for the Seismic Analysis of Building-Soil Systems

by D. B. McCallen, Lawrence Livermore Natl Lab, Livermore, United States,
K. M. Romstad, Lawrence Livermore Natl Lab, Livermore, United States,

Abstract: A finite element based, reduced order, numerical model has been developed for the nonlinear analysis of building-soil systems. The reduced order system model employs an equivalent continuum to represent the moment resisting frame comprising the superstructure, the foundation is idealized as a rigid block, and the soil is discretized with simple isoparametric plane strain elements. An interface stiffness element which has been developed is employed to enforce displacement compatibility between the foundation and soil mass and lift-off of the foundation is allowed. The current paper briefly discusses the components of the system model, and provides example problems which demonstrate the potential utility of the reduced order model for the nonlinear seismic time history analysis of coupled building-soil systems.

Subject Headings: Finite element method | Building systems | Soil analysis | System analysis | Foundations | Mathematical models | Seismic tests | Seismic effects

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