The Study Of The Hysteretic Behavior Of SRC Columns-RC Beam Joints After Fire

Because of intensive staffs, lots of combustibles,complex structure and the fire safety issues of the tall buildings is very outstanding. Once it fire will casue great losses to people ’s lives and property. The steel reinforced concrete structure has lots of advantages such as high bearing capacity, large rigidity, good performance of the seismic resistant and so on,thus it is widely used in the high-rise buildings, however after the fire seismic performance research is relatively few,the study of the mechanical properties after the fire is outstanding practical meaning.The study object is the high- temperature reinforced concrete beam-steel reinforced concrete columns joints.We tested the hysteretic behavior of steel reinforced concrete columns- reinforced concrete beam joints after the high temperature, simulate the existing test by using the finite element software ABAQUS, and compare the simulated results with the experimental data.First of all, three reduced-scale reinforced concrete beam-steel reinforced concrete column joins are produced and two specimens are tested under heating and cooling load. We chose the fire experiment of heating time which is 60 minutes and 90 minutes, adopted natural cooling method after the temperature rise. Analyzing the each measuring point temperature data, temperature field distribution and the change law of heat transfer is studied, of which test specimen.The next, the joints specimens after high temperature and the joints specimens at room temperature are tested at the revered cyclic load. The seismic behavior of joints are affected by the fire duration time through joints failure state, degradation of bearing capacity, displacement ductility, the energy dissipation capacity.For the second time, using finite element analysis software ABAQUS to simulate the experiment, and the results were compared with the experimental results of simulation software, found that the two results are in good agreement, validated the model is reasonably simplified.Finally, discusses the problems to be further studied in the aspects of research reinforced concrete beam-steel reinforced concrete column joins after high temperature action.