An Experimental Study on the Fire Resistance Performance and Residual Strength of U-shaped Composite Beams after Fire

U형 합성보의 내화성능 및 화재 후 잔존강도에 관한 실험적 연구

In recent years, interest in fire-resistant structures is also increasing significantly in Korea. Fire resistance structures in Korea are applied based on specification design, but recent research results that can apply performance design have been published through a research project by the Ministry of Land, Infrastructure and Transport. The performance design is already allowed to apply the fire resistance structure performance design of the 'Rules on the Standards for Evacuation and Fire Protection of Buildings, etc'. Therefore, in this study, a fire-resistant spray or paint was applied to the HyFo composite beam, fire resistance performance tests were conducted, and structural performance tests were conducted on the same specimens to evaluate the residual strength after a fire. As a result of the fire resistance test for 3 hours of the specimens to which the fire-resistant spray was applied, the average temperature was found to be less than about 300 ℃ and the maximum temperature was less than about 400 ℃. In addition, as a result of structural performance tests to confirm the residual strength after a fire, it was confirmed that all of them secured the nominal strength or higher. Therefore, it is judged that the structural performance of the composite beam, which has ensured fire resistance performance by applying fire-resistant spray or paint, will not significantly degrade even after the fire for 3 hours.