SIMPLIFIED VULNERABILITY ASSESSMENT OF RC CIRCULAR PIERS IN MULTI-SPAN-SIMPLY-SUPPORTED BRIDGES Giuseppina Uva a , Domenico Raffaele a , Francesco Porco a , Andrea Fiore a, * a DICATECh, Politecnico di Bari, Italy * DICATECh, Politecnico di Bari, Via Orabona, 4 – 70126 Bari, Italy. Phone: +39 080 5963832, Fax +39 0805963823, email address: andrea.fiore@poliba.it