1st Croatian Conference on Earthquake Engineering 1CroCEE 2021

The lack of interest in replacing or strengthening unsafe buildings is primarily due to limited personal experience with the damage caused by major earthquakes. However, while strong earthquakes are rare, the seismic risk can be significant due to their potentially catastrophic consequences. To help establish an unbiased perception of seismic risk in society, we conducted a seismic stress test of the building stock of the University of Ljubljana (UL). The UL provided data that we improved by inspecting selected buildings and/or available project documentation. The developed exposure model of the UL building stock was then complemented by a seismic hazard model, a seismic fragility model and a consequence model. All models were coupled into the seismic stress test framework based on the seismic risk analysis. In this paper, the seismic stress test framework is briefly summarized with an emphasis on the exposure model. This is followed by the presentation of the results of the study. We show that the seismic fatality risk at the UL is too high. The average annual return period for loss of life among students is only six years, which exceeds the fatality risk of a code-conforming building stock by a factor of 26. Moreover, the expected annual losses are too high. The expected annual cost of repairing seismic damage to UL's building stock was estimated at EUR 1 million, representing about a quarter of UL's Development Fund.