Experimental Research On Static Behavior Of Composite Joints Between Square Hollow STRC Columns And H-shaped Steel Beam

In the performance study of concrete filled steel tube composite column at the same time,based on the column of joints research was also on the agenda,because the column itself structure is relatively complex,coupled with beam-column joint area stress mechanism is not clear,so the research of this kind of joint analysis theory of authority system has not yet formed,H type steel beam and concrete filled steel tube composite column joint has less research,so the joint test simulation analysis in this paper,and delves into the axial compression ratio,etc.The influence of different factors on the class joint,hope for the future study of this kind of joint provides some theoretical support test.The research contents of this paper are as follows:(1)The static load test is carried out on the h-type steel beam joints of four square hollow concrete-filled steel tube composite columns.The influence of axial compression ratio,sleeve thickness and web height on the load displacement curve of the beam end is analyzed,as well as the change of bending moment and Angle in the core area of the joints.At the same time,the deformation of each measuring point of the beam and column in the loading process is analyzed,and the shear deformation trend of the core area is judged according to the deformation law of strain pattern in the core area,so as to deduce the deformation law of the joint under static load.(2)The finite element modeling analysis was carried out on the four test specimens,and the model was defined as close as possible to the actual situation,so that the simulation data could have a certain degree of credibility,and the simulation accuracy could be proved when the reliability of the test was verified by comparing the test data.(3)Taking stiffener strength,steel beam strength,axial compression ratio,sleeve thickness and web height as parameter variables,this paper conducts an in-depth study on the stress mechanism of the joints,and determines the influence of each component in the joint area on the bearing capacity of the joints.(4)Referring to a large number of documents,this paper proposes a practical formula for calculating the bearing capacity of the joint core area,analyzes the contribution of the components of the core area to the bearing capacity of the joint,and puts forward Suggestions for the construction of the joint core area,and finally determines the characteristics of the joint through theoretical analysis.