2nd Croatian Conference on Earthquake Engineering 2CroCEE

In the event of the earthquake that struck the city of Zagreb on the 22nd of March 2020. many of the buildings in the old city centre suffered from various types of damage. Most of the masonry buildings in the old city of Zagreb are over 100 years old, and so is the tramway infrastructure running alongside the buildings. Long operational period of tramway traffic can be an important factor when we talk about the influence of the traffic induced vibrations on seismic vulnerability of the buildings. Long term exposure to high levels of traffic induced vibrations can lead to mortar deterioration and detachment of masonry units. To analyse the influence of vibrations induced by tramway traffic historic data of tram operations and earthquake damage have been investigated. Segmentation of rail tracks was made taking into consideration the distance between the track and surrounding buildings as well as the assessment of damage on the buildings after a recent 2020 earthquake. Furthermore, to inspect the influence of various types of traffic on the surrounding buildings, eight different locations in Zagreb urban core have been chosen for statistical analysis (six streets in the north-south direction and two intersections). Various parameters (type of traffic, distance from the street/rail track, road/railway traffic load) were analysed to determine which of them could cause the increase of masonry structure vulnerability to seismic action.