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BibTeX
Modal analysis of pile-supported structures during seismic liquefaction
Earthquake engineering & structural dynamics, 2014-01, Vol.43 (1), p.119-138
Lombardi, Domenico
Bhattacharya, Subhamoy
2014
Details
Autor(en) / Beteiligte
Lombardi, Domenico
Bhattacharya, Subhamoy
Titel
Modal analysis of pile-supported structures during seismic liquefaction
Ist Teil von
Earthquake engineering & structural dynamics, 2014-01, Vol.43 (1), p.119-138
Ort / Verlag
Chichester: Blackwell Publishing Ltd
Erscheinungsjahr
2014
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
SUMMARY The purpose of this paper is to investigate the effects of liquefaction on modal parameters (frequency and damping) of pile‐supported structures. Four physical models, consisting of two single piles and two 2 × 2 pile groups, were tested in a shaking table where the soil surrounding the pile liquefied because of seismic shaking. The experimental results showed that the natural frequency of pile‐supported structures may decrease considerably owing to the loss of lateral support offered by the soil to the pile. On the other hand, the damping ratio of structure may increase to values in excess of 20%. These findings have important design consequences: (a) for low‐period structures, substantial reduction of spectral acceleration is expected; (b) during and after liquefaction, the response of the system may be dictated by the interactions of multiple loadings, that is, horizontal, axial and overturning moment, which were negligible prior to liquefaction; and (c) with the onset of liquefaction due to increased flexibility of pile‐supported structure, larger spectral displacement may be expected, which in turn may enhance P‐delta effects and consequently amplification of overturning moment. Practical implications for pile design are discussed. Copyright © 2013 John Wiley & Sons, Ltd.
Sprache
Englisch
Identifikatoren
ISSN: 0098-8847
eISSN: 1096-9845
DOI: 10.1002/eqe.2336
Titel-ID: cdi_proquest_miscellaneous_1671440640
Format
–
Schlagworte
Acceleration
,
Damping
,
Design engineering
,
Earth sciences
,
Earth, ocean, space
,
Earthquakes, seismology
,
Engineering and environment geology. Geothermics
,
Engineering geology
,
Exact sciences and technology
,
Internal geophysics
,
Liquefaction
,
model test
,
natural frequency
,
Piles
,
response spectrum
,
Seismic phenomena
,
shaking table
,
Soil (material)
,
Spectra
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