UNIVERSITY OF NAPLES FEDERICO II Department of Structures for Engineering and Architecture PH.D. COURSE IN STRUCTURAL, GEOTECHNICAL AND SEISMIC ENGINEERING COORDINATOR PROF. LUCIANO ROSATI XXIX CYCLE PAOLINO CASSESE PH.D. THESIS SEISMIC PERFORMANCE OF EXISTING HOLLOW REINFORCED CONCRETE BRIDGE COLUMNS TUTOR: PROF. ING. GERARDO M. VERDERAME PROF. ING. ANTONIO OCCHIUZZI 2017