Seismic Performance of Steel Reinforced Concrete Column-Steel Beam Joints after Exposure to Fire

Abstract

Low cyclic reversed loading tests of six steel reinforced concrete column–steel beam joints were conducted to study the failure mode, hysteretic character, and shear mechanism of joints that had been exposed to fire. Two test parameters, i.e. the duration of fire exposure and axial compressive ratio were taken into consideration. Test results showed that the failure mode of the joints after exposure to fire was basically the same as that of joints maintained at room temperature. Due to the shear resistance of the steel reinforcement, the maximum loading strength of the joints after fire exposure declined indistinctively, however displacement corresponding to the maximum loading strength increased notably. The rigidity, ductility and energy dissipation of the joints after exposure to fire decreased compared to the joints maintained at room temperature, and the extent of reduction was related to heating time and axial compressive ratio.