<abstract xmlns="http://www.w3.org/1999/xhtml">The aim of this study is to consider the effects of the variation of shear modulus ratio (<italic>G/G</italic><italic>0</italic>) and damping ratio (<italic>ξ</italic>) of soil, obtained by a linear iterative method based on the design spectra of seismic codes, the soil environment in terms of uncertainties in shear modulus using Monte Carlo simulations and the foundation damping (<italic>ξ</italic><italic>f</italic>) of flexible base for analyses of the Soil-Structure Interaction (SSI) problems. A squat structure with circular shallow foundation resting on a soil layer over a homogeneous half-space is studied by using cone model and considering seismic zone effect on structural response. Firstly, after showing the effects of the correction of <italic>G</italic> and <italic>ξ</italic> on impedance functions and the responses of soil-foundation-structure system, a study is carried out to compare these effects to those of the modelling of uncertainties in shear modulus as random variations. Secondly, a comparative analysis on design response spectra and base shear forces was carried out for four seismic codes (Algerian Seismic Rules RPA99-2003, Eurocode 8–2004, International Building Code IBC-2015 and Indian Code IS-1893-2002) considering the three cases of SSI: SSI effects (initial <italic>G</italic> and <italic>ξ</italic>), nonlinear SSI (corrected <italic>G</italic> and <italic>ξ</italic>) and stochastic SSI (random <italic>G</italic> with COV = 20%) compared to the fixed base case. Results show that the correction of <italic>G</italic> and <italic>ξ</italic>, according to the equivalent nonlinear method in all the cases, leads to a remarkable decrease in peak responses but show a huge amount of reduction in the second study for IBC-2015 and IS-1893-2002 codes compared to the other codes.</abstract>

The aim of this study is to consider the effects of the variation of shear modulus ratio (G/G0) and damping ratio (ξ) of soil, obtained by a linear iterative method based on the design spectra of seismic codes, the soil environment in terms of uncertainties in shear modulus using Monte Carlo simulations and the foundation damping (ξf) of flexible base for analyses of the Soil-Structure Interaction (SSI) problems. A squat structure with circular shallow foundation resting on a soil layer over a homogeneous half-space is studied by using cone model and considering seismic zone effect on structural response. Firstly, after showing the effects of the correction of G and ξ on impedance functions and the responses of soil-foundation-structure system, a study is carried out to compare these effects to those of the modelling of uncertainties in shear modulus as random variations. Secondly, a comparative analysis on design response spectra and base shear forces was carried out for four seismic codes (Algerian Seismic Rules RPA99-2003, Eurocode 8–2004, International Building Code IBC-2015 and Indian Code IS-1893-2002) considering the three cases of SSI: SSI effects (initial G and ξ), nonlinear SSI (corrected G and ξ) and stochastic SSI (random G with COV = 20%) compared to the fixed base case. Results show that the correction of G and ξ, according to the equivalent nonlinear method in all the cases, leads to a remarkable decrease in peak responses but show a huge amount of reduction in the second study for IBC-2015 and IS-1893-2002 codes compared to the other codes.

Seismic codes based equivalent nonlinear and stochastic soil structure interaction analysis

Studia Geotechnica et Mechanica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The aim of this study is to consider the effects of the variation of shear modulus ratio (G/G0) and damping ratio (ξ) of soil, obtained by a linear iterative...

Seismic codes based equivalent nonlinear and stochastic soil structure interaction analysis

Article Category: Original Study

Published Online: Oct 23, 2020

Page range: 1 - 14

Received: Mar 31, 2020

Accepted: Aug 29, 2020

DOI: https://doi.org/10.2478/sgem-2020-0007

Keywords
Shear modulus, damping, uncertainties, linear iterative method, seismic code

© 2021 Mohamed Elhebib Guellil et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Seismic codes based equivalent nonlinear and stochastic soil structure interaction analysis

Article Category: Original Study

Published Online: Oct 23, 2020

Page range: 1 - 14

Received: Mar 31, 2020

Accepted: Aug 29, 2020

DOI: https://doi.org/10.2478/sgem-2020-0007

KeywordsShear modulus, damping, uncertainties, linear iterative method, seismic code

© 2021 Mohamed Elhebib Guellil et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
Shear modulus, damping, uncertainties, linear iterative method, seismic code