Many structural collapses due to fires occurred several hours after the event of a fire, indicating the presence of substantial post-fire stresses within structural members. Residual stresses in structural steel are locked-in initial stresses formed due to the manufacturing processes. Residual stresses play an important role in the design strength equations of steel beams at ambient temperature. But, there is little understanding on how the distribution and magnitude of these residual stresses change after the event of a fire and their impact on the residual strength of structures. The changes in the initially assumed residual stresses after a fire depend on several factors, such as the temperature of exposure, the rate of heating, the rate of cooling, and the number of sides of the member exposed to heating or cooling. Limited data in literature indicate a reduction in the residual stresses after exposure to high temperatures, but the studies were limited to all-side exposure (uniform heating) and natural air cooling. Hence, the present study focuses on determining the magnitude and distribution of residual stresses more comprehensively under a broader range of test conditions, such as the number of fire-exposed faces, cooling methods and application of insulation. In addition to residual stresses, the changes in material properties, such as Young's modulus, yield strength and ultimate strength, shall also be recorded at elevated temperatures through experiments. Subsequently, the experimental results shall be validated via numerical simulations. The residual strength curves of the steel members will be provided using the help of these finite element simulations.