Research On Mechanical Behavior And Design Approach Of Composite Joints With End-plate Connection

With the increasing use of steel structures in practice,the research on the behaviors of composite joints with end-plate connection used in steel frames has attracted extensive interests in recent times.In this paper,the static behaviors of the'å·¥'shaped beam to column composite joints with end-plate under the symmetrical vertical load was studied.The main contests are listed as follows:1 The finite element model(FEM) of composite joints with end-plate,which will be used in the ABAQUS software,was developed.By the comparison between calculated results and experimental results,the veracity of such FEM were proved.Some key technologies,such as element selection, preload of bolts,model of interface contact,material model and so on,were discussed based on the three-dimension FEM.2 Analytical models for the beam to column composite joints with end-plate connection under monotonic loading were developed by finite element analysis(FEA) software ABAQUS.The calculated results were verified by the test results in this paper and those in the literature The mechanism and failure model of such connections were illustrated by(FEA).By the analysis of different parameters mechanical performance,also,the influencing rules of joints in rigidity and carrying capacity,and so on. which include slab reinforcement ratio,steel beam height,end-plate thickness, column-web stiffness and the beam and column section size,were obtained.3 In order to analyze the working capacities of the connections,some parameters in the design methods of Eurocode 3 were modified.The practical model of the relationships between bending moment to rotation were also proposed and the calculated results were compared with the FEM results and EC3 models,respectively.The results of this research show: The practical model in this paper can also simulate the relationships between bending moment to rotation rationally.