Experimental Study Of Reinforced Concrete Beam-column Substructures Experienced High Temperature On Collapse Resistance Performance

The integrity security of the building structures has always been a main problem in the structural design.When it suffers from the casual extreme load caused all of a sudden by the events such as fire,explosion and impact,the structure will take on a disproportional collapse locally or on the large area,which results in massive casualty and economic loss.Therefore,in addition to ensuring the security and reliability of the structure in strength,rigidness and stability when it bears the normally design load according to the normal design methods,the structure should be ensured to be able to resist the above collapse caused by the casual extreme load.On the other hand,with the speed up of urbanization process,these factors which lead to the possibility of fire are increased.After fire,reinforced concrete structures are caused unrecoverable damage which affecting its working performance.This paper mainly based on the following research.1?By collecting relevant data at home and abroad,this paper introduces the correlation theory and research status of the structure progressive collapse,and summarizes the research status of the fire resistance of reinforced concrete structures,summarized some of the problems still exist,which made the objective and significance of this paper.2?Through the study of 6 specimens of different anchorage length,this paper mainly research on collapse performance of the beam-column joint after high temperature effect.Among them,2 specimens are tested by anti-progressive collapse underhigh temperature,3specimens are tested by anti-progressive collapse after high temperature,1 specimen is tested by anti-progressive collapse at room temperature.The heating mode use electric heating method combined with flame heating.3?Through the test of temperature field,the distribution of sectional internal temperature field of reinforced concrete beam-column joints are got to know under high temperature and after high temperature,while the remaining capacity analysis of experimental data for components provided.4 ? Through studying on the anti-progressive collapse experimental research of the reinforced concrete beam-column joints enduring high temperature,this paper obtained the capacity of vertical and axial horizontal force changes,investigated the effect of different anchorage length on the mechanical properties of strength of reinforced concrete beam-column joints,ductility and other indicators.