1st Croatian Conference on Earthquake Engineering 1CroCEE 2021

Post-earthquake assessment can be defined as a procedure to define the given structure's safety and usability after an earthquake. The seismic behaviour of buildings depends on numerous parameters such as the construction, building material, the geometry of the structure, stiffness properties and non-linear aspects, conceptual design, etc.

Brief facts about the Zagreb earthquake, the typology of buildings in the city of Zagreb, and basic information about the procedures after the earthquake itself will be described. The paper's focus is set on using unmanned aerial devices (UAV) in the post-earthquake assessment of the city of Zagreb after the earthquake on 22nd March 2020. A need for rapid, flexible and systematic assessment of rooftop and façade elements arose due to numerous multi-story buildings heavily damaged by earthquake in time of COVID-19 pandemic and complete lockdown. Methods, procedures, and developed system for the data collection and analysis will be explained, and future development ideas will be presented. Developed on-line platform minimizes the risk for engineers and improve detection of structural damage on hard to reach and dangerous locations. It also allows remote assessment of on-site acquired aerial photography increasing potential workforce involved. A brief comparison of on-site post-earthquake damage assessment and assessment with UAVs is presented to get a better insight into UAVs' possibilities in fast and accurate assessments of areas stuck by an earthquake.