TA project: SERFIN

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

Photogrammetry was used to monitor the bottom part of the northern in-filled wall of the SERFIN model. A report on this optical measurement technique and the results on the displacement fields and the cracking of the specimen in the monitored zone is available here.

Click here and here to watch two videos from the SERFIN tests.

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

TITLE OF PROPOSAL: Seismic Retrofitting of RC Frames with RC Infilling (SERFIN) – Proposals for EC8-Part 3

30 November 2009

STARTING DATE: October 2009

END DATE: December 2011 (last access day)

NO. OF USERS (researchers): 7

Christis Chrysostomou - Cyprus University of Technology  


Toula Onoufriou - Cyprus University of Technology
Nicholas Kyriakides - Cyprus University of Technology
Panayiotis Roussis - University of Cyprus
Panagiotis Kotronis - Ecole Centrale Nantes (France)
Telemachos Panagiotakos - DENCO Design & Engineering Consultants (Greece)
Antonis Kosmopoulos - DENCO Design & Engineering Consultants (Greece)


The construction of new walls is the most effective and economic method for retrofitting multi-storey reinforced concrete buildings, especially those with Pilotis (soft-storey). Their structural and economic effectiveness increases when they result from infilling with RC a bay of an existing frame. Due to the practical difficulties of testing large specimens with high force resistance, only one- or two-storey specimens of such a system have been tested up-to-date. Because of this lack of knowledge EC8 Part 3 does not cover this technique despite its cost-effectiveness and popularity.
In order to start filling this gap of knowledge, it is proposed to study experimentally the effectiveness of seismic retrofitting of multi-storey multi-bay RC frame buildings by converting selected bays into new walls through infilling with RC. The full-scale test specimens will have the central bay infilled with RC wall. The specimens will be subjected to ground motions compatible with a target spectrum at different levels of peak ground acceleration. A test structure is proposed consisting of two parallel retrofitted frames, to be tested with the pseudo-dynamic method. The main parameters of the test structure will be the connection between the RC infill and the surrounding RC frame and the percentage of the reinforcement in the RC infill. The effect of these parameters will be studied during the experiment, by using different connection details and reinforcement percentages for the two infilled frames and/or at their different storeys. Open issues such as the interaction between the infill wall and the frame, and the effect of higher modes on the shear forces in the various storeys after formation of a plastic hinge at the base of the wall, will be studied. Numerical simulations of the results will be made, to develop/calibrate a methodology for the calculation of the force resistance, the stiffness and the deformation capacity of such assemblages, with the ultimate goal to develop design procedures for effective retrofitting of RC frames by converting selected bays into RC walls, through RC-infilling. A proposal will come out for Part 3 of EC8, the current provisions of which do not cover this very common and effective type of retrofitting.

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