| The beam-column joint, which plays the role of transmiting the moment and shear, is the key to steel structure design, and its performance directly affect the overall structure of reaction. With the rapid development of the steel structures,the steel structure engineering at home and broad have done a great amount of researches on beam-column joints extensively.T-stub steel casting connection is a new type of semi-regid connections,which by using steel casting to connect the flange of beam and column connected together with high-strength bolts. Compared to the normal casting node T-stub connection, the T-stub steel casting connection avoids the stress concentration caused by welding, having the benefits such as better seismic performance and hysteretic appearance, stronger integrity, faster installation in the construction, better shape, on the whole, T-stub steel casting connection has good applicability.In this paper, normative specimens were selected according to related specifications. For reference and contrast, the influence on the joint mechanical behavoir caused by various geometry parameters of the connections was studied.Firstly, T-stub steel casting connection of beam-column joints model was established. With the change of the parameters, the failure modes and static performance under static load were studied, and then, the influence of various parameters on the static performances of the joint were studied according to moment - rotation curve calculated by ANSYS. The results show that the steel casting stiffener thickness, the steel casting vertical limb thickness and the column flange thickness have obvious influence on the static performance of the joints. On the contray, the steel casting horizontal limb thickness, the beam flange thickness, the beam web thickness and the column web thickness have little influence on it. When the column flange is thick enough to resist the deformation of the joints effectively, the column horizontal stiffener have little influence on the static performance of the joint. Otherwise, it has significant influence on the static performance of the joint when the column flange is too thin.Then the hysteretic behavior of the joint was investigated by ANSYS, and the effects of parameters on the hysteretic behavior were studied. The results show that the steel casting stiffener thickness, the vertical limb thickness and the column horizontal stiffener have remarkable influence on the hysteretic capability of the joint. On the condition that the thicknesses of the steel casting stiffener and the vertical limb are reasonable and horizontal stiffeners are implemented as reinforcement, the hysteretic curves of the joints are stable and plump. It indicates that good seismic behavior perform the secant stiffness of the joint decreases along with the increasing of periodic displacement cycles. But variations of the steel casting horizontal limb thicknesses and the beam web thickness have little effect on the hysteretic behavior, because the skeleton curves almost superimpose each other with the variations taking place. |
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