Equivalent-linear dynamic stiffness of surface footings on liquefiable soil

Xenia A. Karatzia; George E. Mylonakis; George D. Bouckovalas

doi:10.7712/120117.5500.18213

Equivalent-linear dynamic stiffness of surface footings on liquefiable soil

Xenia A. Karatzia, George E. Mylonakis, George D. Bouckovalas

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

4 Citations (Scopus)

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Abstract

The focus of the present study is upon the influence of liquefaction on the dynamic impedance (stiffness and damping) of rigid square footings resting on liquefiable soil under external harmonic loading. A three-layer soil profile, consisting of a loose liquefiable sandy layer sandwiched between two impermeable stiff clayey layers, is considered to this end. Using simplified cone models and rigorous boundary element analyses, a systematic parametric study is performed to investigate the influence of liquefaction on the dynamic impedance of the footing. Vertical, horizontal and rocking oscillations are considered in the frequency domain. The results demonstrate that for common soil, foundation and seismic excitation conditions, liquefaction in the foundation soil yields significant degradation of the dynamic spring coefficients and increases the associated damping coefficients. Based on the parametric study, regression formulae are obtained for estimating the static stiffness coefficient of rigid square footings on liquefied soil.

Original language	English
Title of host publication	COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
Publisher	National Technical University of Athens
Pages	1388-1402
Number of pages	15
ISBN (Electronic)	9786188284418
DOIs	https://doi.org/10.7712/120117.5500.18213
Publication status	Published - 29 Sep 2017
Event	6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2017 - Rhodes Island, Greece Duration: 15 Jun 2017 → 17 Jun 2017

Conference

Conference	6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2017
Country/Territory	Greece
City	Rhodes Island
Period	15/06/17 → 17/06/17

Keywords

Equivalent-Linear
Liquefiable Soil
Static Stiffness
Surface Footing
Three-Layer Soil Profile

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10.7712/120117.5500.18213

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Karatzia, X. A., Mylonakis, G. E., & Bouckovalas, G. D. (2017). Equivalent-linear dynamic stiffness of surface footings on liquefiable soil. In COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (pp. 1388-1402). National Technical University of Athens. https://doi.org/10.7712/120117.5500.18213

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abstract = "The focus of the present study is upon the influence of liquefaction on the dynamic impedance (stiffness and damping) of rigid square footings resting on liquefiable soil under external harmonic loading. A three-layer soil profile, consisting of a loose liquefiable sandy layer sandwiched between two impermeable stiff clayey layers, is considered to this end. Using simplified cone models and rigorous boundary element analyses, a systematic parametric study is performed to investigate the influence of liquefaction on the dynamic impedance of the footing. Vertical, horizontal and rocking oscillations are considered in the frequency domain. The results demonstrate that for common soil, foundation and seismic excitation conditions, liquefaction in the foundation soil yields significant degradation of the dynamic spring coefficients and increases the associated damping coefficients. Based on the parametric study, regression formulae are obtained for estimating the static stiffness coefficient of rigid square footings on liquefied soil.",

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Karatzia, XA, Mylonakis, GE & Bouckovalas, GD 2017, Equivalent-linear dynamic stiffness of surface footings on liquefiable soil. in COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. National Technical University of Athens, pp. 1388-1402, 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2017, Rhodes Island, Greece, 15/06/17. https://doi.org/10.7712/120117.5500.18213

Equivalent-linear dynamic stiffness of surface footings on liquefiable soil. / Karatzia, Xenia A.; Mylonakis, George E.; Bouckovalas, George D.

COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. National Technical University of Athens, 2017. p. 1388-1402.

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

TY - GEN

T1 - Equivalent-linear dynamic stiffness of surface footings on liquefiable soil

AU - Karatzia, Xenia A.

AU - Mylonakis, George E.

AU - Bouckovalas, George D.

PY - 2017/9/29

Y1 - 2017/9/29

N2 - The focus of the present study is upon the influence of liquefaction on the dynamic impedance (stiffness and damping) of rigid square footings resting on liquefiable soil under external harmonic loading. A three-layer soil profile, consisting of a loose liquefiable sandy layer sandwiched between two impermeable stiff clayey layers, is considered to this end. Using simplified cone models and rigorous boundary element analyses, a systematic parametric study is performed to investigate the influence of liquefaction on the dynamic impedance of the footing. Vertical, horizontal and rocking oscillations are considered in the frequency domain. The results demonstrate that for common soil, foundation and seismic excitation conditions, liquefaction in the foundation soil yields significant degradation of the dynamic spring coefficients and increases the associated damping coefficients. Based on the parametric study, regression formulae are obtained for estimating the static stiffness coefficient of rigid square footings on liquefied soil.

AB - The focus of the present study is upon the influence of liquefaction on the dynamic impedance (stiffness and damping) of rigid square footings resting on liquefiable soil under external harmonic loading. A three-layer soil profile, consisting of a loose liquefiable sandy layer sandwiched between two impermeable stiff clayey layers, is considered to this end. Using simplified cone models and rigorous boundary element analyses, a systematic parametric study is performed to investigate the influence of liquefaction on the dynamic impedance of the footing. Vertical, horizontal and rocking oscillations are considered in the frequency domain. The results demonstrate that for common soil, foundation and seismic excitation conditions, liquefaction in the foundation soil yields significant degradation of the dynamic spring coefficients and increases the associated damping coefficients. Based on the parametric study, regression formulae are obtained for estimating the static stiffness coefficient of rigid square footings on liquefied soil.

KW - Equivalent-Linear

KW - Liquefiable Soil

KW - Static Stiffness

KW - Surface Footing

KW - Three-Layer Soil Profile

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BT - COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering

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Y2 - 15 June 2017 through 17 June 2017

ER -

Equivalent-linear dynamic stiffness of surface footings on liquefiable soil

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