What are the analysis and methods of strengthening historical building structures?

Analysing and strengthening historical structures are challenging task due to the geometrical complexity and lack of knowledge about the inner core material and due to the fact that the masonry material is not able to carry tensile stresses. A better understanding of both gravity load transfer mechanism and lateral resisting system of such structures is the key issue for a comprehensive structural analysis, interpretation of the analysis result s and a proper intervention. Nowadays, with the development of computational methods, analyses of historical structures are mostly performed using Finite Element Analyses. Generating a finite element model of the structure require a good engineering experience to make a reasonable geometrical simplification of the complex geometry and a good assumption of unknown inner-core materials.