1 Critical assessment of intensity measures for seismic response of Italian RC bridge portfolios Claudia Zelaschi 1 , Ricardo Monteiro 2 , Rui Pinho 3 1 Corresponding author ROSE Programme, School of Advanced Studies IUSS Pavia Palazzo del Broletto, Piazza della Vittoria n. 15, 27100 Pavia (Italy) e-mail: claudia.zelaschi@umeschool.it 2 School of Advanced Studies IUSS Pavia Palazzo del Broletto, Piazza della Vittoria n. 15, 27100 Pavia (Italy) e-mail: ricardo.monteiro@iusspavia.it Tel.: +39 0382 375852, Fax: +39 0382 375899 3 University of Pavia, Department of Civil Engineering and Architecture Via Ferrata 1, 27100 Pavia (Italy) e-mail: rui.pinho@unipv.it Abstract The seismic assessment of a road network depends largely on the characterization of the fragility of its bridge components. The accuracy of bridge seismic demand estimates and the use of proper intensity measures (IM) will significantly influence such task. The available literature has mainly focused on buildings or a limited number of bridge configurations and IMs, which may not be representative for bridge portfolio assessment studies. In this paper, the correlation quality between a larger pool of traditional and innovative IMs and the nonlinear dynamic response of typical Italian RC bridges is investigated to identify the best performing IMs. Keywords: Intensity measures, Seismic assessment, Italian RC bridge portfolios, Random sampling, Seismic Demand.