TA project: DYNCREW

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Read more on the progress and test results of DYNCREW in the Joint brochure of the SERIES TA facilities.

TITLE OF PROPOSAL: Experimental Investigation of Dynamic Behaviour of Cantilever Retaining Walls

HOST TA FACILITY: 
EQUALS, Bristol, UK

TA AGREEMENT BETWEEN USERS AND FACILITY:
May 2010

STARTING DATE:
June 2010

END DATE:
March 2012

NO. OF USERS (researchers):
8

LEAD USER:
Aldo Evangelista - Università di Napoli Federico II (Italy)

ADDITIONAL USERS:

Anna Scotto di Santolo - Università di Napoli Federico II (Italy)
Armando Lucio Simonelli - University of Sannio (Italy)
Augusto Penna - University of Sannio (Italy)
Pamela Imbriale - University of Sannio (Italy)
Carmine Lucadamo - University of Sannio (Italy)
George Mylonakis - University of Patras (Greece)
Panos Kloukinas - University of Patras (Greece)


SUMMARY OF PROPOSED RESEARCH:

An experimental investigation is proposed, of the elastoplastic behaviour of cantilever retaining walls supporting a granular backfill, subjected to combined gravitational and seismic loading by means of 1-g shaking table model tests specifically designed for different compliance levels of the wall base and heel length. The following sets of models are planned, to be realized on a large laminar box, with maximum height (H) of approximately 75cm:
-  Model 1: Cantilever wall with a short heel on rigid base: Rankine stress characteristics will intersect the body of the wall, while the base of the wall will rest directly on the base of the shear stack. The failure mechanism will be limited to sliding and tilting of the base.
-  Model 2: Same as 1 above, but with a long heel so that Rankine stress characteristics will fully develop in the soil without intersecting the wall.
- Model 3: Cantilever wall with short heel on flexible base: The wall will rest on a dense sand deposit of thickness equal to 1/3 the wall height H. The possible failure mechanism will include bearing capacity of the footing.
- Model 4: Same as 3 above, but with long heel so that Rankine stress characteristics will fully develop in the soil. Possible failure mechanisms include sliding, tilting and bearing capacity.
Wall displacements, rotations as well as contact stresses and accelerations in the wall and the soil will be monitored using pertinent instrumentation. A set of approximately 5-10 ground motions will be used to investigate issues related to acceleration, velocity and frequency content of the seismic input. Analytical simulations will be conducted using models of different complexity. Results will be presented in dimensionless graphs and charts that highlight the salient features of the problem. Issues related to scaling laws of inelastic deformations will be investigated. 

What's next

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

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