Investigation of seismic performances of unconnected pile foundations using dynamic centrifuge tests

An unconnected pile foundation allows separation between the lower pile and the pile cap, and it has been proposed as an effective foundation type for reducing the seismic load during strong earthquakes. However, previous quantitative evaluations of unconnected piles with various foundation types an...

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Bibliographic Details
Published in:Bulletin of earthquake engineering 2019-05, Vol.17 (5), p.2433-2458
Main Authors: Ha, Jeong-Gon, Ko, Kil-Wan, Jo, Seong-Bae, Park, Heon-Joon, Kim, Dong-Soo
Format: Article
Language:English
Subjects:
Centrifuge model
Centrifuges
Civil Engineering
Damping
Damping ratio
Earth and Environmental Science
Earth Sciences
Earthquakes
Environmental Engineering/Biotechnology
Foundation settlement
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Model testing
Original Research
Pile caps
Pile foundations
Piles
Sandy soils
Seismic activity
Seismic engineering
Seismic response
Shaking
Shallow foundations
Soil
Stiffness
Structural Geology
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Summary:An unconnected pile foundation allows separation between the lower pile and the pile cap, and it has been proposed as an effective foundation type for reducing the seismic load during strong earthquakes. However, previous quantitative evaluations of unconnected piles with various foundation types and earthquake intensities are inadequate. In this study, the influence of base shaking level and the material of the interposed layer between pile and pile cap on the seismic behaviour of unconnected piles were evaluated using a centrifuge model test to reproduce the field stress conditions. A dynamic centrifuge model test was completed on an experimental model consisting of dry sandy soil, a foundation and a single degree-of-freedom structure. The acceleration of the structure and the settlement of the foundation system were measured during base shaking. For the unconnected pile system, the structural seismic load reduction effect due to rocking behaviour was confirmed, and the unconnected pile foundation with the interposed layer with large stiffness had less vertical settlement than the conventional shallow foundation. Finally, the rotational stiffness and damping ratio for the foundation system used in the centrifuge model tests were derived and discussed.
ISSN:1570-761X
1573-1456
DOI:10.1007/s10518-018-00530-y