Maintenance and seismic retrofit cost assessment of existing bridges

The work describes an integrated procedure for the assessment of the condition state and seismic vulnerability of existing road bridges. Visual inspections aimed to evaluate a total sufficiency rating (TSR) and develop a simplified seismic assessment have been performed for each structure according to previous procedures proposed by the authors (Pellegrino et al. 2011; Pellegrino et al. 2014). The outcomes have been used as input data for a subsequent statistical analysis for calibrating new unitary maintenance, seismic retrofit and total cost equations. The procedure was applied to a stock of structures in the Vicenza province, North-Eastern Italy and could allow public authorities/private managing companies to estimate economic indicators for the estimation of the amount of resources needed for bridge maintenance and retrofit in seismic zones.