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Optimal implementation of frequency domain impedances in time domain simulations of building structures on embedded foundations

Kusanovic, Danilo S. and Seylabi, Elnaz E. and Asimaki, Domniki (2020) Optimal implementation of frequency domain impedances in time domain simulations of building structures on embedded foundations. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20200220-133401533

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Abstract

Soil-Structure Interaction (SSI) have been studied the last decades, and proper analysis for the linear elastic case in frequency domain has been established successfully. However, SSI is rarely considered in the seismic design of building structures. Regardless of its importance as a significant source of flexibility and energy dissipation, buildings are analyzed using a rigid base assumption, and the design is based on a response spectrum analysis, for which not only the soil, but also time are totally ignored. In a first attempt to improve and to incentivize time domain analyzes compatible with standard finite element packages for the engineering community, the state-of-practice introduces two major simplifications to transform the frequency domain analysis into a time domain analysis: (a) it assumes the frequency at which the impedance value should be read is the flexible-base frequency, and (b) it also assumes that the foundation input motion preserves the phase of the free field motion. Upon these simplifications, the following questions may arise: How does NIST recommendations perform in overall against a full finite element model? Are the embedment effects for shallow foundation not important so that the phase angle can be neglected? What is the best dimensionless frequency to estimate the soil impedance? Is it possible to make a better estimation of the dimensionless frequency to increase the NIST accuracy? In this study, we attempt to address these questions by using an inverse problem formulation.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
https://doi.org/10.31224/osf.io/fyw82DOIDiscussion Paper
ORCID:
AuthorORCID
Kusanovic, Danilo S.0000-0002-0935-2577
Seylabi, Elnaz E.0000-0003-0718-372X
Asimaki, Domniki0000-0002-3008-8088
Additional Information:License: CC-By Attribution 4.0 International. SUBMITTED ON February 17, 2020; LAST EDITED February 18, 2020. 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.
Funders:
Funding AgencyGrant Number
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)UNSPECIFIED
Subject Keywords:Ensemble Kalman Inversion; Inverse problem; Mathematical modeling; NIST; Period Elongation; Radiation Damping; Reduced-Order Model; Soil-structure interaction; System identification
Record Number:CaltechAUTHORS:20200220-133401533
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200220-133401533
Official Citation:Kusanovic, D. S., Seylabi, E. E., & Asimaki, D. (2020, February 18). Optimal implementation of frequency domain impedances in time domain simulations of building structures on embedded foundations. https://doi.org/10.31224/osf.io/fyw82
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101426
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Feb 2020 21:39
Last Modified:09 Mar 2020 13:19

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