Experimental Research On Seismic Behaviour Of Joints In A Reinforced Concrete Frame After Fire

Reinforced concrete frames are one of the most popular structures used at present. The beam-column joints play an important role in the frame structures. In the paper, the reinforced concrete frame joints are chosen typically. The residual seismic performances of full-scale joint after fire are discussed preliminary.Three large-scale joints in a reinforced concrete frame are made and tested at the constant load under standard heating load, the heating time of 60 minutes and 90 minutes is chosen. Observed the temperature distribution, deformation and the test phenomenon, the fire-resistant properties of joints are affected by the axial compression ratio, load ratio and heating times. After the experiment, the joint is cooled naturally.The natural cooling joint and the reference joint are tested at the revered cyclic load. The joints are affected by the axial compression ratio, load ratio and heating times through test phenomenon, failure mode, shear deformation of the joint area, degeneration of bearing capacity, rigidity, joint ductility and energy dissipation capacity.