Abstract
Firstly, some important aspects of the restoration and structural strengthening of historical masonry buildings are briefly discussed. Particularly, as an illustration of the appropriate approach to solving such an issue, an example of the restoration of the Minceta fortress in Dubrovnik has been described. Based on the results of the extensive field and laboratory works with defined damages and cracking state in the fortress, as well as located sliding surfaces in foundation rock near deep excavation, the static and dynamic analysis of stress-strain states and safety was performed at the characteristic time point in the history of the fortress. Different geometry models for discretization of the fortress and the foundation rock, as well as different constitutive models for masonry and rock, were considered. Based on the results of the case study, the solutions were proposed for the strengthening of the foundation rock, as well as for the restoration and the limited allowed strengthening of the fortress. It is believed that this study may be helpful in the restoration and strengthening of similar historical masonry structures.
Highlights
A large number of diverse historical buildings in the world require restoration
Conclusions e historic Minceta fortress in Dubrovnik has been severely damaged, with the risk of collapse when it is subjected to even moderate earthquake action. e initial stability reduction of the fortress was caused by the deep excavation along its north-western edge. e adverse layering of the stone cliffs at that location and the gravity load of the fortress caused the shift of the fortress toward the deep cut and the formation of the sliding surface of the rock toward the deep cut
Some of the fortress damage is probably due to the effects of temperature and earlier earthquakes
Summary
A large number of diverse historical buildings in the world require restoration. Due to the demand for their great seismic resistance, as well as for other reasons, there is a need to strengthen their structures. E stone columns are often present in numerous historical masonry buildings, whether they are major structural or desirable aesthetic elements (Figure 5).
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