PSI - Issue 64

Galić Josip et al. / Procedia Structural Integrity 64 (2024) 908 –917 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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1. Introduction In 2020, both Zagreb and Petrinja were struck by strong earthquakes. Zagreb was hit on March 20, 2020, with a magnitude of 5.5 on the Richter scale and the epicenter located 7 km from the city center. Petrinja experienced a more significant earthquake on December 29, 2020, with a magnitude of 6.2 on the Richter scale. Petrinja is approximately 40 km away from Zagreb, so the earthquake significantly damaged buildings in both cities, especially in Zagreb, which had already suffered damage earlier that year in the March earthquake. Most of the buildings in Zagreb's city center were constructed before 1964. when the first seismic regulations were adopted in this area. This includes many public buildings, such as faculties, hospitals, and schools. Buildings constructed before 1964. generally, lack sufficient seismic resistance, as evidenced by the damage sustained after both earthquakes. Following both earthquakes, the Solidarity Fund from EU was activated to finance the reconstruction of all damaged public buildings in the affected area. Currently, approximately 45 faculty buildings, 20 hospital buildings, and around 20 school buildings are still undergoing reconstruction. The subject of this study is to present an analysis of the current state of the building structure of the Faculty of Political Sciences, followed by an analysis of its reconstruction and strengthening. The Faculty of Political Sciences is in the heart of Zagreb's city center. The building's position within the city center is depicted in the following image (Fig.1), sourced from Google Maps (2024)

Fig. 1. Position of Zagreb and building in Zagreb city centre

The faculty has two buildings: the courtyard building and the street building. The subject of this analysis is the street building. It has a T-shaped layout and was constructed in 1951 as a workers' dormitory. In 1962, it became the Faculty of Political Sciences building. Since that time, the building has not undergone significant changes or reconstruction.

Fig. 2. (a) Photo of building in 1951; (b) Photo of building in 2019; (c) Original first floor plan