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 |
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| 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 | |
| Publication status | Published - 29 Sept 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