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Chair of Mechanics and Materials, Faculty of Civil Engineering, Saints Cyril and Methodius University of Skopje , Skopje , North Macedonia
Chair of Mechanics and Materials, Faculty of Civil Engineering, Saints Cyril and Methodius University of Skopje , Skopje , North Macedonia
Although concrete is classified as a non-combustible material and generally exhibits good fire resistance, exposure to elevated temperatures may significantly reduce the mechanical properties of concrete and reinforcing steel, resulting in cracking, spalling, reinforcement degradation, excessive deformations, and, in severe cases, structural collapse. Following a fire event, reliable assessment of the residual structural capacity is essential for deciding whether damaged structures can be safely repaired and returned to service or should be demolished. This paper presents an overview of the behaviour of reinforced concrete structures subjected to fire, emphasizing the mechanisms of thermal damage, assessment methodologies, and available repair techniques. A case study involving the assessment and rehabilitation of a fire-damaged reinforced concrete building is presented to illustrate the practical application of these methods.
RC structures, fire damage, damage assessment, residual load-bearing capacity, structural rehabilitation
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