10th International Cpngress on Advances in Civil Engineering, Turkey, 01 November 2012, vol.1, no.1
As the capital city of Byzantine and Ottoman Empires, Istanbul contains many historical structures. Unlike the important public structures such as mosques, churches, palaces etc., private houses could not save their historical and structural characteristics. In the course of time, some architectural and structural changes have been applied to those structures. In this respect this study aims to show how these structures lose their historical identity and how their earthquake performance is affected. As a case study, six-storey masonry structure has been selected and analysed from Beyoğlu district. It has been determined that the structure had been altered before – some structural walls have been removed and a storey has been added to the original structure. The original structure and altered structure have been analysed and their performance have been compared to each other.