1st Croatian Conference on Earthquake Engineering 1CroCEE 2021

The article describes history, approaches and well-tested technologies, which have developed and have successfully applied for preventive reinforcement of insufficiently earthquake-resistant buildings of Petropavlovsk-Kamchatsky. This was required due to the short-term forecast of earthquake with M ~ 7.5 and in the corresponding of order of Russia Council of Ministers on upgrading the seismic resistance of housing stock and life facilities in Kamchatka. At that time technologies were based on the experience of restoring Tashkent after the earthquake of 1966, i.e. it were time-consuming, expensive and, most importantly, required a complete shutdown of the operation of buildings for a long time. Seismic evaluation and certification of housing stock (beginning with stone and large-block residential buildings) and earthquake resistance assessment of schools and hospitals buildings were carried out preliminarily. Several scenarios of probable disasters were developed as part of the disaster mitigation program. Then the Russian-Yugoslav JV "Andriakampacific" was specially founded to develop and implement advanced technologies into practice of strengthening the buildings without stopping their operation and evicting people. Advantages and disadvantages, results of our joint activity to reduce seismic risk in Kamchatka are described. Seems, the received experience is gaining new value today both for reconstruction after strong and damaging earthquakes, and for cases of combination of earthquakes with epidemiological hazards, as it was the case in Zagreb on March 22, 2020. This article is dedicated to the bright memory of my talented colleague and kind friend Prof. Bosko Petrovic.