Pseudo-dynamic testing of repaired and retrofitted RC bridges

Pseudodynamic tests on repaired and retrofitted bridges piers have been performed. More specifically, one repaired and retrofitted pier specimen is physically tested, white the rest of the bridge is numerically simulated using an in-house test apparatus. Techniques for repairing and retrofitting of the most stressed r.c. circular piers of a bridge designed according to Italian Code before 1986 severely damaged after previous pseudodynamic and cyclic tests, are described. The specimens, in scale 1:6, have been repaired using epoxy adhesive, stainless steel rebars, self compacting concrete (SCC), strengthened with carbon fiber reinforced polymer (CFRP) wrapping and then tested again by pseudodynamic tests, under the seismic action used for first tests on undamaged specimen. Some considerations on sustainability for seismic repairing and upgrade of r.c. bridges are given. Finally, the seismic behaviour of the retrofitted bridge piers has been compared to the seismic behaviour of the original piers and to numerical results of a detailed fiber model built in OpenSees.