We examine the spectral properties of the vibrations of ITU TRIGA MARK-II nuclear research reactor building located at the Istanbul Technical University Ayazaga campus, Istanbul, Turkey. Istanbul is located in a seismically active region, where a large earthquake is expected. The building is for the first time equipped with sensors by a government-university-industry collaboration. We installed twelve tri-axial MEMS accelerometers to the three-story building for monitoring purposes. We estimated the basic dynamic characteristics of the building, namely, modal frequencies, translational and rotational modes, and the soil structure interaction of the building by spectral methods, using a recorded earthquake and continuous vibration data. Our results are in general in agreement with the results of numerical calculations based on simple clamped model and three dimensional finite element structural analysis model. The aim of the study, in long term, is to monitor the structural health of the reactor building and involve a rapid damage assessment system as well as the earthquake early warning system to the reactor control facility.


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