Assessment of the stability of existing bridges is very significant in the process of defining the optimal structural measures for their maintenance and strengthening. To define the optimal structural measures for repair and strengthening, it is necessary to establish a complete database on existing bridge structures containing their identification data as well as monitor their conditions. This paper describes a study on the bridge infrastructure network in Republic of N. Macedonia realized as part of the INFRA-NAT project (www.infranat. eu). The bridge database was developed based on the data collection form and allows to establish the detailed exposure model of the entire bridge network.

By considering the general characteristics of all the structures, to develop fragility functions for bridges exposed to seismic hazard, representative samples of bridges are considered. The connectivity of the network is modelled and the entire bridge network vulnerability is considered in a more comprehensive and global manner for seismic hazard. The scope of this work is to provide practical web-based tools and databases for each country with which more informed decisions can be made related to the most vulnerable parts of the country and where resources should be invested for increased resilience.