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.
N1 - Funding Information:
This research was co-financed by the European Union (European Social Fund - ESF) and Greek national funds through the Operational Program "Education and Lifelong Learning" of the National Strategic Reference Framework (NSRF)-Research Funding Program: THALES. Investing in knowledge society through the European Social Fund. The help of Professors Demosthenes Polyzos and Dimitri Beskos of UPatras in making available ISoBEM software to the authors is gratefully acknowledged, as well as the help of Professor Stephanos Tsinopoulos of the Technological Institute of Patras in using the software.
PY - 2017
Y1 - 2017
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
UR - http://www.scopus.com/inward/record.url?scp=85042507452&partnerID=8YFLogxK
U2 - 10.7712/120117.5500.18213
DO - 10.7712/120117.5500.18213
M3 - Conference contribution
AN - SCOPUS:85042507452
T3 - COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
SP - 1388
EP - 1402
BT - COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
A2 - Papadrakakis, M.
A2 - Fragiadakis, Michalis
PB - National Technical University of Athens
T2 - 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2017
Y2 - 15 June 2017 through 17 June 2017
ER -