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The 13th century Castle Trakošćan (Croatia) is a building of outstanding historical and cultural heritage significance. Since construction, the castle was subjected to structural changes, in particularly in 16th (at that time the artillery towers and the first floor was added, the central tower was raised and a courtyard with arcades was formed), 18th (around the fortress a cinquefoil of defensive structures, walls and towers is being built) and 20th century (partial retrofitting). The castle’s structural system consists from irregular brick and stone unreinforced masonry walls, domes, vaults and arches, as well as of timber flooring. It is founded on a rocky peak. The building is currently used as a museum. As observed by in-situ visual inspection, the castle suffered from slight structural damage during the M5.5 (VIII EMS) and M6.2 (VIII-IX EMS) earthquakes in Croatia, which struck the city of Zagreb on 22 March 2020 and the Pokupsko-Petrinja area on 29 December 2020, respectively. In order to evaluate the earthquake performance of the “undamaged” building, and based on the information collected, the structural analysis was performed by means of a computer program. The structural modelling relied heavily on the built-in material characteristics. The compromises had to be made due to the suitability and availability of the modelling options incorporated into the computer program. The principal and critical structural weaknesses, that require detail assessment, were identified. |
