A Comparative Study on the Interpretation Procedure of Field Tests for Measuring the Dynamic Impedance of a Surface Footing
| Autor: | Filomena de Silva, Chiara Amendola, Dimitris Pitilakis, Francesco Silvestri |
|---|---|
| Přispěvatelé: | de Silva, F., Amendola, C., Pitilakis, D., Silvestri, F. |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
forced vibration test
foundation stiffness Snap-back test forced vibration test real-scale prototype foundation stiffness foundation damping rocking foundation real-scale prototype foundation damping Snap-back test Building and Construction rocking foundation Geotechnical Engineering and Engineering Geology Civil and Structural Engineering |
| Popis: | The paper analyses in detail and compares different interpretation procedures of snap-back and forced-vibration tests on a full-scale prototype founded on soft-soil, in order to assess their effectiveness for measuring the stiffness and damping of a shallow foundation under dynamic loads. Both properties were back-calculated through three alternative methods, i.e. through impedance functions computed in the frequency domain, or by interpreting force-displacement loops in terms of peak-to-peak amplitudes or of phase-shift. The damping was further calculated from the logarithmic decrement of free-vibration records. The resulting foundation stiffness and damping were observed to vary with the number of cycles and with the load frequency and amplitude. The comparison among the interpretation techniques revealed that the peak-to-peak approach fails when damping is high, because it neglects the delay between force and displacement. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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