TA project: RETRO

Read the final report of the RETRO project.

A concise presentation of the progress of RETRO is available in the Joint brochure of the SERIES TA activities.

TITLE OF PROPOSAL: 

Assessment of the seismic vulnerability of an old RC viaduct with frame piers and study of the effectiveness of different isolation systems through Pseudodynamic test on a large scale model

HOST TA FACILITY: 
ELSA, JRC, Ispra, Italy

TA AGREEMENT BETWEEN USERS AND FACILITY:
June 2010

STARTING DATE:
June 2010

END DATE:
July 2013

NO. OF USERS (researchers):
13

LEAD USER:
Fabrizio Paolacci - University of Roma Tre (Italy)

ADDITIONAL USERS:
Luigi di Sarno - University of Sannio (Italy)
Rosario Ceravolo - Politecnico di Torino (Italy)
Nicos Makris - University of Patras (Greece)
Mustafa Erdik - Kandilli Observatory and Earthquake Research Institute (Turkey)
Agostino Marioni - ALGA S.p.A. (Italy) 
Mauro Sartori – ALGA S.p.A. (Italy)
Renato Giannini – Università Roma Tre (Italy)
Cem Yenidogan – KOERI (Turkey)
Arkam Mohamad - Università Roma Tre (Italy)
Luca Zanotti Fragonara – Politecnico di Torino (Italy)
Raffaele De Risi – Università di Napoli (Italy)
Mario Colantuono – Università Roma Tre (Italy)

SUMMARY OF PROPOSED RESEARCH:

The proposal aims to study the seismic behaviour of existing reinforced concrete (RC) bridges together with the analysis of the effectiveness of innovative and traditional retrofitting systems. The attention will be paid on old bridges generally not properly designed for seismic action. In particular viaducts with frame piers will be analyzed because of their high seismic vulnerability.
On the basis of a previous experimental campaign consisting of cyclically imposed displacements on 1:4 reduced scale models of a frame pier belonging to a typical old RC highway viaduct, a new experimental activity is proposed.
Two specimens (scale 1:2), a frame pier of 2 levels (height ≅7.5 m) and a frame pier of 3 levels (height ≅ 12.5 m), will be constructed and tested using the PsD technique with sub-structuring, which includes the modelling of the entire viaduct to which they belong. Asynchronous ground motion effects will be taken into account. Several test configurations will be considered: 1) a retrofitted viaduct using two isolation systems (Lead Rubber Bearings - LRB, Spherical Sliding Bearings -SSB) and 2) an “as-built” viaduct imposing a medium damage level. For each phase of the experimental campaign a proper dynamic identification will be performed.
The aim is twofold: 1) increase the knowledge on the non-linear behaviour of RC frame piers details in presence of plain steel bars on which few studies have been conducted and 2) study the effectiveness of seismic isolation systems.

 

What's next

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

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