The current paper presents the study that was implemented in the framework of a diploma thesis in the school of Civil Engineering of the Aristotle University of Thessaloniki aiming at evaluating and managing the seismic risk of the internal Ring Road of Thessaloniki in Greece, focusing on the bridges along it. To achieve this, the study includes the following steps: i) the assessment of the seismic hazard of the area, ii) the examination of the structural vulnerability of the bridges and iii) the redirection of traffic in the adjacent urban road network after the occurrence of seismic faults on some of the examined bridges. Towards this direction firstly, some general meanings are presented related to the seismic risk of everyday life activities’ networks and the factors which influence them, namely the seismic hazard of the area, the structural vulnerability and the importance of the element under consideration, specializing in road networks. Secondly, the available methods for classification and creation of vulnerability curves of bridges at international and national level are described in detail. The geological and geotechnical aspects of the study area are given and in combination with the available soil simulants, the seismic response of the soil in the area around the bridges for a certain earthquake scenario is calculated. The earthquake scenario is calculated with an average period of reintroduction Tm=475 years and maximum acceleration on rocky background equal to 0.25g. Based on the method FEMA-NIBS (HAZUS), the corresponding vulnerability curves for all the bridges along the inner Ring Road are notified that are likely to experience higher levels of damage in the case of the examined earthquake scenario. With the results presented above, scenarios of traffic rearrangement are presented, in case of a possible blockade of roads due to repair works in two of these bridges. To this end, the best alternative route of the road network in the area is identified and the new distances and timing of such routes are evaluated. Finally, the conclusions drawn from the present thesis work are summarized.

vulnerability curves; seismic risk; Ring Road of Thessaloniki; soil stimulants; traffic rearrangement