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Recent seismic activity in Croatia has caused significant damage to a large number of old masonry buildings. Since the post-earthquake condition and mechanical properties are not known, on-site experimental testing is an important segment of the maintenance and repair of old masonry buildings. In this paper, the results of experimental determination of the mechanical properties and dynamic parameters on the damaged maisonette building of Sisak highschool are presented. In order to confirm and validate the experimental results, a numerical analysis of the building was performed. After making the initial FE model, the comparison between the natural frequencies obtained from the model and the experimental results revealed unsatisfactory outcomes. Therefore, the FE model was calibrated through a whole series of iterations: modification of the boundary conditions, modelling of partition walls, modelling of the damages and modification of the global stiffness of the structure. After a series of iterations, the global stiffness was significantly reduced by nearly 50% of the experimental results, ultimately leading to a satisfactory result. Apart from the reliability of the numerical model and the calibration of the numerical model analyzed here, by repeating the test after the future renovation (considering changes in building mass), the experimentally determined dynamic parameters of the structure can be used to verify the effects of the renovation of the building. |
