TA project: PILESI

Click here to read the final report of the PILESI project.

A concise presentation of the aim and main outcomes of PILESI is available in the Joint brochure of the SERIES TA facilities.

TITLE OF PROPOSAL:
 Experimental Investigation of Soil-Pile-Structure Seismic Interaction

HOST TA FACILITY: 
EQUALS, Bristol, UK

TA AGREEMENT BETWEEN USERS AND FACILITY:
September 2010

STARTING DATE:
February 2010

END DATE:
March 2012

NO. OF USERS (researchers):
12

LEAD USER:
Armando Lucio Simonelli - University of Sannio (Italy)

ADDITIONAL USERS:

Amir M. Kaynia – NGI, Norwegian Geotechnical Institute (Norway)
Gianni Dente – University of Calabria (Italy)
Roberto Cairo – University of Calabria (Italy)
Andrea Chidichimo – University of Calabria (Italy)
Luigi Di Sarno – University of Sannio (Italy)
Stefania Sica – University of Sannio (Italy)
Maria Giovanna Durante – University of Sannio (Italy)
Georgios Anoyatis – University of Patras (Greece)
George Mylonakis – University of Patras (Greece)
Arezou Modaressi – Ecole Centrale Paris (France)
Luis Todo Bom – Ecole Centrale Paris (France)

SUMMARY OF PROPOSED RESEARCH:

A crucial topic of Soil-Structure Interaction (SSI) during earthquakes is soil-pile-foundation interaction induced by seismic waves. During strong earthquakes, foundation piles tend to significantly modify soil deformations, since they oppose their motion. The interplay between soil and foundation-structure causes the base motion applied on the superstructure to deviate from the free-field motion, and the piles to be subjected to additional bending, axial and shearing stresses. The bending moments, usually referred to as “kinematic”, may be very large, even in the absence of the superstructure. As is well-known, modeling SSI of a complete structure-foundation-soil system by a large scale testing is quite complicated (additional degrees of freedom, necessity to simulate wave propagation, duly accounting for the non linearities that depend on the induced strain level). These are some of the reasons why SSI has received very little experimental attention and very few results are available for calibration of numerical models. Up to date several mathematical models have been developed for the analysis of kinematic effects in single piles or pile groups. Despite the above research efforts, many aspects of SSI in the case of piled foundation have not been completely understood yet, such as the interplay between inertial and kinematic phenomena, the importance of non-linear response of soil and pile materials, pile-soil interface, etc. The objective of the project is to investigate the seismic response of foundation piles on pile models tested on the shaking table. For such a scope, the proposing team seeks to take advantage of the pioneering experimental activity carried out at Bristol University during the past ReLUIS project. 

What's next

Series logo small   SERIES Concluding Workshop
  Joint with US-NEES "Earthquake Engineering Research Infrastructures

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