System Identification Techniques for Inelastic Structures

by Dimitris F. Eliopoulos, Univ of Illinois at Urbana -, Champaign, Urbana, United States,
Yi-Kwei Wen, Univ of Illinois at Urbana -, Champaign, Urbana, United States,

Document Type: Proceeding Paper

Part of: Mechanics Computing in 1990's and Beyond


A classical optimization algorithm is used to identify the parameters of a smooth hysteretic restoring force model, which can be used to describe the inelastic behavior of structures under loading due to wind, earthquakes or ocean waves. The recorded response of the structure of a specific load from laboratory experiments or field measurements can be used as the input for the identification of the model parameters. Incremental equations of motion reduce the computational size of the identification problem significantly, and improve the accuracy of the solution. A simple example demonstrates the efficiency and accuracy of the method used. The method can be very effective for modeling large systems subjected to random excitation, e.g. in the study of seismic safety of structures.

Subject Headings: Structural models | Inelasticity | Structural behavior | Structural safety | Parameters (statistics) | Wind loads | Ocean waves | Equations of motion

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