Structural renovation of residential building in Zagreb after the 22 March 2020 earthquake

Rad detaljno prikazuje faze koje je potrebno proći kako bi se zgrada oštećena u potresu koji je pogodio Zagreb 22. ožujka 2020. obnovila i pojačala do zahtijevane razine potresne otpornosti. Prikazane su sve faze počevši od preliminarnog pregleda pa potom i detaljnog pregleda, izrade elaborata ocjene stanja građevinske konstrukcije, projekta obnove te konačno izvođenja radova obnove uz stručni nadzor. Posebna je pozornost usmjerena na proračun građevine nelinearnom statičkom metodom koja se temelji na pomacima, tzv. "pushover analysis" ili metoda postupnog guranja, za koju se smatra da je jedna od najprimjerenijih metoda za seizmičku analizu postojećih zidanih konstrukcija. Svi postupci koji su provedeni u sklopu ove obnove su provedeni u skladu sa zakonskom regulativom koja je stupila na snagu nakon potresa.The phases that must be completed so that a building damaged in earthquake that struck Zagreb on 22 March 2020 can be renovated and strengthened to the required level of seismic resistance are presented in the paper. All phases are therefore presented, starting from the rapid and then detailed inspection, and continuing with preparation of the structural condition assessment report, preparation of renovation design and, finally, ending with realisation of work with expert supervision. A special attention is paid to structural analysis that is conducted using a nonlinear static method based on displacements, the so called pushover analysis, which is considered to be one of the most appropriate methods for seismic analysis of existing masonry structures. All procedures conducted in the scope of this renovation were realised in accordance with legislation that entered into force after the earthquake