A Statistical study on the harmonized up-to-date Turkish building stock

Talas Soylu, Gizem Nur
In Turkey, where three significant fault lines locate, earthquakes with a magnitude greater than 6.5 happen in every 10 years (Azak et al., 2014). In this sense, to estimate damage on building stock and fatalities accurately, real characteristics of Turkish building stock (TBS) should be known well. Gathering TBS portfolio is previously studied but these studies have focused on relatively smaller areas or have been outdated or both. This study made an comprehensive search on available data sources and detailed investigation on two sources: 2000 Building Census and Building Occupancy Permit Statistics disseminated by Turkish Statistical Institute. Then, the available databases including TBS is harmonized to generate a consistent and complete building stock data for its use in earthquake loss estimation studies. The attributes, which are considered as primary earthquake risk parameters, are the location (in province-scale resolution for İstanbul and region-scale and city-scale resolution for all other places in Turkey), the construction year, the function, the structural system, the number of stories, the material of infill walls, the number of dwelling units and total produced floor area. This study examined 9394841 buildings in total and presented the distribution of TBS characteristics with respect to the parameters and their relation. To conclude, this study presents gathering of the harmonized up-to-date Turkish building stock portfolio and investigations on building characteristics. The aim of this study is to provide a reference building database for Turkey and corresponding statistics to be used for earthquake loss es timation studies.