stručni rad
Earthquake in Zagreb and Sisak in 2020 caused a large number of damages in load bearing and non-load bearing structural elements of masonry buildings in lower town in Zagreb. Almost all of damaged buildings in Zagreb lower town are under cultural protection. Retrofitting project of the buildings that are under cultural protection have a special requirement. If building suffered large number of load bearing element damages, usually engineers agree that most efficient way for these buildings is demolition of building (excluding masonry street facades under cultural protection), and building totally new building. This is usually best solution because retrofitting existing structures would be too expensive and earthquake resistance of retrofitted building would not be enough for design according to European standards that are currently valid. This study investigates the behavior of a steel structure in supporting masonry street facades under the loading conditions of the structure's self weight, the weight of the supported masonry structure, as well as wind and seismic forces. A comparison of multiple steel structure models was conducted considering various cross-sectional shapes: square hollow section (SHS), circular hollow section (CHS) and H – steel profiles (HEA). Steel structure was fabricated using S235 grade steel. Models were created in SCIA Engineer 22.0 software. In software steel structure were modelled, all loads were applied, manual combinations were made and all calculation according to ultimate limit state and serviceability limit state were performed. The comparison of structural models took into account the efficiency of steel elements, the required amount of steel (cost estimation for different cross section shapes), displacements of the structure and the activation of masses in two orthogonal directions.
steel; seismic; masonry; design
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