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Optimization of frequency domain impedances for time-domain response analyses of building structures with rigid shallow foundations

Kusanovic, Danilo S. and Seylabi, Elnaz E. and Asimaki, Domniki (2021) Optimization of frequency domain impedances for time-domain response analyses of building structures with rigid shallow foundations. Earthquake Spectra, 37 (3). pp. 1955-1979. ISSN 8755-2930. doi:10.1177/8755293020981994.

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The effects of dynamic soil–structure interaction (SSI) have been extensively studied in the last few decades, and proper analysis for the linear elastic case in frequency domain has been established successfully. However, SSI is rarely considered in the design of building structures, and instead, buildings are frequently analyzed using a rigid base assumption and quasi-static loading conditions that ignore SSI and its dynamic nature. Acknowledging these shortcomings, the National Institute of Standards and Technology (NIST) published in 2012 a set of recommendations on time-domain analyses of SSI for building structures compatible with standard finite element packages for consideration in engineering design. The so-called NIST GCR 12-917-21 report introduced a major simplification to enable frequency domain tools to be implemented in time domain analyses. That is, replacing the frequency-dependent soil impedance functions by a single-valued functions read at the flexible-base structure frequency; This work seeks to quantify the accuracy of this simplification considering fully coupled two-dimensional (2D) finite element models (FEM) as the reference. Using a Bayesian approach based on ensemble Kalman inversion (EnKI) and a range of numerical simulations of soil–foundation–building interaction, we estimate the optimal frequency that can be used to estimate soil impedance for time domain analyses; and we evaluate the improvement that the corresponding impedance offers relative to the full FEM results when compared to time domain analyses performed in accordance to the NIST recommendations outlined above.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Kusanovic, Danilo S.0000-0002-0935-2577
Seylabi, Elnaz E.0000-0003-0718-372X
Asimaki, Domniki0000-0002-3008-8088
Alternate Title:Optimal implementation of frequency domain impedances in time domain simulations of building structures on embedded foundations
Additional Information:© The Author(s) 2021. Date received: 5 April 2020; accepted: 21 November 2020. First Published January 19, 2021. The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The authors would like to acknowledge CONICYT–Becas Chile for the financial support to the first author for conducting doctoral studies at The California Institute of Technology. The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
Funding AgencyGrant Number
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)UNSPECIFIED
Subject Keywords:Soil–structure interaction, system identification, ensemble Kalman inversion, period elongation, radiation damping, inverse problem, NIST, reduced order model, mathematical modeling
Issue or Number:3
Record Number:CaltechAUTHORS:20200220-133401533
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Official Citation:Kusanovic, Danilo S., et al. “Optimization of Frequency Domain Impedances for Time-Domain Response Analyses of Building Structures with Rigid Shallow Foundations.” Earthquake Spectra, vol. 37, no. 3, Aug. 2021, pp. 1955–1979, doi:10.1177/8755293020981994
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101426
Deposited By: Tony Diaz
Deposited On:20 Feb 2020 21:39
Last Modified:04 Oct 2021 18:09

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