Experimental Study And Theoretical Analysis Of Side Column Joint Of The Frame With Hybrid Dry Method

The hybrid frame structure composed of reinforced concrete columns and steel beams has the advantages of high utilization rate of materials,low cost and fast construction speed,which is reasonable and economical in material selection.For reinforced concrete columns,it has better stability and durability than steel columns;for steel beams,it has small section,light self weight,and saves the amount of formwork,which can be applied to large-span structures.Therefore,the connection form of the beam column joint,which is the main force transmission part of the hybrid frame,is the key of the research.Through reasonable design,the connection form of top and bottom angle steel and high-strength bolt can make RCS beam column joint show typical semi-rigid characteristics.Therefore,in this paper,a kind of connection form of side column joint is put forward,which is made up of prefabricated reinforced concrete column connected by top and bottom angle steel and connected by steel beam.The joint form integrates the advantages of RCS structure,semi-rigid connection and dry assembly structure.In this paper,experimental research and theoretical analysis are carried out for this kind of joint,and design suggestions are put forward.The main contents of this paper are as follows:(1)Through the monotonic static loading test of three side column joint members,the influence of beam height and bolt row number of beam end on the flexural performance of the beam column joint of the dry mixed frame is studied;the force transfer mechanism of the joint is obtained through the analysis of the failure mode of the joint;the initial stiffness and bearing capacity of the joint are investigated through the P-Δ curve and the M-θ angle curve of the joint;the ultimate bearing capacity of the joint is the highest After that,the mechanical evaluation and reasonable suggestions are made for the bending capacity of the joint through the analysis results.(2)Through the low cycle repeated loading test of three members,the seismic performance of this type of joint is discussed and analyzed,and the hysteretic curve,energy consumption,stiffness and ductility of each test piece are investigated and analyzed.(3)In this paper,the static behavior of the joint is studied,and the finite element model is established.The correctness of the finite element model analysis is verifiedby comparing the numerical simulation and test data of ABAQUS.On this basis,the influence of angle steel thick Ness,stiffener thickness,high-strength bolt preload and friction coefficient on the mechanical properties of beam column joints are studied.Through the finite element analysis,the failure mode and stress mechanism of the joint are clarified,which provides the theoretical basis for RCS joint design.(4)Based on a large number of finite element model calculation results in this chapter,the influence of various factors on the joint bearing capacity is compared and analyzed,and the calculation expression of bending bearing capacity of the hybrid dry method frame beam column joint is proposed,and compared with the theoretical calculation value by using the existing test data and finite element calculation results,the agreement is good,which can meet the needs of engineering design.