Sandro Pertini Bridge
Year: 2005 - Location: Macerata, Italy
Extremely urgent seismic design and retrofit of the ‘900 masonry arch bridge; 311 ft lenght, 5 spans.
The Pertini bridge belongs to the SP 77, dated to the early twentieth century and made of 5 masonry arched bays, it was closed to traffic for static safety reasons. In 40 days only, with a careful organization of the works and the use of prefabrication technologies, a new first category bridge, seismically isolated, has been built without affecting the aesthetics of the original one, that was subjected to historical and artistic restrictions. The new independent bridge was obtained by emptying the filling of the arches, two large diameter drilled piles (1.2 m) have been placed inside each pier and abutment.
On the connecting cap beam on top of these were placed three elastomeric isolators HDRB. The deck was built using precast T beams made continuous by means of an additional concrete casting.