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Discrete-time filter approach for performance-based seismic assessment of inelastic structures subject to soil-structure interaction effects

This work demonstrates the use of discrete-time filters as a means of approximating foundation impedance functions for use in accounting for inertial soil-structure interaction during inelastic substructure analyses. To do so, a simple soil-foundation-structure model is excited by a suite of ground motions selected to induce yielding within the structure at varied ratios of predominant period of excitation to structural period. The response history analyses computed using the filter method are compared to those obtained using a baseline convolution solution and current state-of-practice solutions. The accuracy and computational efficiency of the filter and state-of-practice methods are measured against the baseline solution. Comparisons are also drawn between the various performance-based substructure results and results obtained prescriptive, code-based methods.

Author(s):

Richard Gash    
University of California, Los Angeles
United States

Elnaz Esmaeilzadeh Seylabi    
University of California, Los Angeles
United States

Ertugrul Taciroglu    
University of California, Los Angeles
United States