EQUIVALENT-LINEAR DYNAMIC STIFFNESS OF SURFACE FOOTINGS ON LIQUEFIABLE SOIL
Abstract eng: 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.
Contributors:
Publisher:
National Technical University of Athens, 2017
Conference Title:
Conference Title:
COMPDYN 2017 - 6th International Thematic Conference
Conference Venue:
Rhodes Island (GR)
Conference Dates:
2017-06-15 / 2017-06-17
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.
Record appears in:
Record created 2017-06-22, last modified 2017-06-22
guest ::
