During their economic lifetime, buildings may face partial and sometimes complete collapse due to errors made during the design or construction phase. With the examination of partially or completely collapsed buildings and investigating the reasons for the collapse, a lot of valuable information has emerged for engineers. This knowledge is a guide for engineers about the points to be considered during the design and manufacturing phase of new buildings. During the construction of the South East Anatolia Project, Renewable Energy and Energy Efficiency R&D Center (GAP YENEV) building located in the Osmanbey campus of Harran University, a partial collapse occurred in the cantilever flooring system. This event, which was overcome without loss of life, caused the construction to stop for a certain time and financial losses. In this study, the reasons for the collapse of the mentioned cantilever slab were investigated. As a result of the examinations and analyses made, it has been observed that the current load situation of the building and the load analysis in the approved reinforced concrete application project do not coincide with each other. This situation revealed that the collapse occurred because of serious mistakes made during both the project phase and the manufacturing phase of the building. With the ABAQUS program, the unit-width cantilever of the building was modeled and analyzed both as it should be and in its current form, and its moment carrying capacities were compared. The analysis revealed that the current moment capacity of the cantilever slab was considerably lower than the capacity it should have been. In the last part of the study, the strengthening works carried out on the building are explained. A lot of valuable information was obtained both while investigating the reasons for the collapse of the building and during the retrofitting works.

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