ABSTRACT
This chapter describes a comparative numerical study of 17th century cathedral-turned-intomosque preserved in Algiers, the capital of Algeria. Ketchaoua Mosque is a masonry structure with a rectangular plan representing features of cross-shaped cathedrals and is located at the foot of the Casbah, a UNESCO World Heritage Site. The structure has been monitored and analyzed because of an emerging damage on minarets and some part of vaults due to some important seismic events. Ketchaoua Mosque is a masonry structure with a rectangular plan. Resembling to a classical cross shaped cathedral in plan, various sizes of domes complement the shape to a rectangle. The minarets are the most vulnerable parts of Ketchaoua Mosque due to their slender structure. The modal properties of the minarets obtained from the finite element method are compared with the ones obtained through system identification.
