12 th International Conference on Structural Analysis of Historical Constructions SAHC 2020 P. Roca, L. Pelà and C. Molins (Eds.) STRUCTURAL ASSESSMENT OF THE 13TH CENTURY GREAT MOSQUE AND HOSPITAL OF DIVRIGI: A WORLD HERITAGE LISTED STRUCTURE CEM DEMIR* † , OMER FARUK HALICI †† , ALI NAKI SANVER ††† , MUSTAFA COMERT ††† , FIKRET KURAN †††† , NICOLA BERLUCCHI ††††† , ALI HURATA †††† AND ALPER ILKI † † Istanbul Technical University, Civil Engineering Faculty Ayazaga Campus, 34750, Sariyer, Istanbul, Turkey E-mail: demirce@itu.edu.tr*, ailki@itu.edu.tr - Web page: http://www.itu.edu.tr †† MEF University, Department of Civil Engineering Ayazaga Caddesi, No: 4, 34396, Sariyer, Istanbul, Turkey E-mail: halicio@mef.edu.tr - Web page: http://www.mef.edu.tr ††† RISE Engineering & Consultancy Eclipse Maslak C15, Maslak, Sariyer, Istanbul, Turkey E-mail: alinaki@rise.ist, mustafa@rise.ist - Web page: http://www.rise.ist †††† Directorate General of Foundations Milli Müdafaa Caddesi, No: 20, Kızılay , Çankaya, Ankara, Turkey E-mail: f.kuran@vgm.gov.tr, a.hurata@vgm.gov.tr - Web page: http://www.vgm.gov.tr ††††† Studio Berlucchi S.r.l Contrada Soncin Rotto, 4, Brescia, Italy E-Mail: nicolaberlucchi@studioberlucchi.it - Web page: http://www. studioberlucchi.it Keywords: Assessment, Masonry, Mosque, Seismic, Retrofit, World Heritage Abstract. The Great Mosque and Hospital of Divrigi is located in the central eastern part of Turkey, in Divrigi, Sivas. The historical facility consists of a monumental mosque and a two-story hospital, which are adjacent to each other. The structure dates back to 13th century Mengujekids period and has been listed by the UNESCO as a World Heritage since 1985. Great Mosque and Hospital of Divrigi is particularly notable for its monumental stone portals that are decorated with three-dimensional ornaments carved from stone. The structural system of the monument consists of multi-leaf stone masonry walls and stone piers that support the roof structure which consists of stone and brick arches and vaults. The structure is located about 90 km away from the North Anatolian Fault Line, that has been causing several destructive earthquakes. Consequently, the structure is prone to destructive seismic activities. In this study, after a brief introduction on the structural system and current condition of the structure, the structural performance of the Great Mosque and Hospital of Divrigi is investigated through site observations and structural analyses. For this purpose, linear and nonlinear 3D finite element models of the structure are developed and the structure is examined under the effects of vertical loads and seismic actions. In the light of the analyses results, recommendations for potential interventions are outlined for further preservation of the structure.