Seismic Behavior Of Through-Diaphragm Connection Between Rectangular Concrete Filled Tube Column And H-shaped Steel Beam

Nowadays, research has been done on the bearing capacity and seismic behavior of through-diaphragm connection between rectangular concrete-filled tube column to steel beam, it is far from enough, though. It is necessary to go about experiments and finite element analysis, in order to pave path to evaluating the behavior of the connection more clearly and proposing the moment-bearing and shear bearing formulas.In the paper, the property of CFT component and prevalent CFT column to beam connection were presented. The brief introduction to the through-diaphragm connection home and abroad was given. Based on the Tianjin Library Project, one through-diaphragm connection betweenrectangular CFT Column to beam was tested under cyclic load, with the purpose of studying its seismic behavior. The tests results and the failure modes were described. According to the data analysis, the stress distribution and connection seismic resistance capacity were obtained. It demonstrated that the strength regression was not significant and the stiffness remained stable until the connection appeared to yield. The ductility coefficient of the connection was 3.10 and accumulative equivalent damping coefficient researched 0.27, which beat concrete connection and equal to the steel reinforced concrete connection.ANSYS was applied, which involves large geometric deformation, material nonlinearity and contact condition. The distribution stress and seismic behavior were gained as well. The results demonstrated that stress concentration occurred at the areas like the diaphragm edge spot, the soldering hole, the welded area between diaphragm and beam. More attention should be paid to the soldering hole design and processing. The comparison between test results and the finite element analysis on lateral load versus lateral displacement cyclic curves agreed well with each other, which is more obvious during the unloading stages. Given the same displacement as the finite bearing placement, the ductility coefficient and accumulative equivalent damping coefficient of the ANSYS results fit well with the test data. Parameter analysis was carried out to discuss the possible factors that might affect the connection seismic behavior. The variables included the ways of loading and the axial compression ratio. Suggestions were presented at the end of the paper.