Research On The Seismic Performance Of Post-fire Steel Reinforced Concrete Column-reinforced Concrete Beam Joints And Its Repair

Steel-concrete composite structures have been widely applied in various types of building structures. It is very important to study the seismic performance of post-fire steel reinforced concrete column-reinforced concrete beam joints for the structural after-fire evaluation. Steel reinforced concrete column-reinforced concrete beam joints, which have been used widely in practical projects, are selected as the research objects. The seismic performance and reinforcement of post-fire steel reinforced concrete column-reinforced concrete beam joints are been studied.The main research work includes:1.Through two SRC column to RC beam joints under cyclic loading test, to assess its seismic performance with the test date, also analyzed the seismic performance of the node affected by the axial compression ratio.2.Fire test were carried on four SRC column to RC beam joints to study the internal temperature distribution of this type joints. Through the two ordinary temperature joints and four post-fire joints under cyclic loading test, analyzed the post-fire SRC column to RC beam joints’ seismic performance and the affected by the fire duration time and axial compression ratio.3.One SRC column to RC beam joints was repaired and strengthened with externally CFRP, and then test under cyclic loading, also compared with non-repaired nodes, researched the seismic performance of this kind of nodes after reinforcement.4.One post-fire SRC column to RC beam joints was repaired and strengthened with externally CFRP, and then test under cyclic loading, also compared with comparison nodes, researched the seismic performance of this kind of nodes after reinforcement.