| Recent years, rectangle steel tumb columes get more and more widely used with large section moment of inertia, good overall stability,easy construction, etc.Usually rectangle steel tumb colume and H-shaped steel beam use the welding way to connect,but welding has many disadvanges such as increased node brittle, weld quality is influenced by the construction conditions, etc. So people begin to pay attention to the prefabricated connection form with advantage of sharply reduce the welding work. The prefabricated connections between rectangle steel tumb colume and steel beam are often using sleeve connertion at present, and experts at home and abroad have done a lot of research about outer sleeve beam-column connertion, but the research about inner sleeve with the advantages of architectural modeling beautiful, short construction period is less. So the mechanical properties research for inner sleeve connection is necessary.Based on these considerations, ANSYS finite element methods are carred out in this paper in order to model the steel pipe inner sleeve-T section beam-column joint and obverse the damage form, analysis the mechanical properties such as hysteretic performance, skeleton curve and the bearing capacity, energy dissipation capacity of this node under cyclic displacement load. Studying stress distributiont of connectors in inner sleeve-T section beam-column joint under changing the geometric parameters of inner sleeve with changing the thickness and length of it, and combined with practical engineering, designing and calculating the force condition of this node in steel frame.The results show that: Under reciprocating loading, inner sleeve-T section beam-column joint showed good hysteretic behavior, hysteretic curve of specimen reversearch shape, in the process of displacement loading due to the influence of high strength bolt slippage hysteresis curve of the specimens exits pinch shrinkage phenomenon on a certain extent, finally because of T-section steel flange produces large plastic deformation lead to node failure. Increasing the thickness of inner sleeve can improve joint stiffness and specimen hysteretic behavior, and at the same time increase yield bearing capacitythe and ultimate bearing capacity of specimen. The ability of consumption kinetic energy imporved under reciprocating loading and the high strength bolt tension value increases gradually, but because of the T-section steel plastic deformation decrease the stress level of inner sleeve and T-section steel are trend lower. Increasing the length of inner sleeve leads to high strength bolts and high strength split bolts vertical spacing increase, decreased the constraint of T-section steel. So T-section steel central flange occurre bending deformation and the end region occure warping deformation, and plastic deformation increased. At the same time yield bearing capacitythe and ultimate bearing capacity of specimen are both decreased, deformation ability is raised, T-section steel stress and high strength bolt tension value decrease. So it is recommended that on the premise of meet the requirements of connection, the sleeve length to reduce as much as possible and thickness is greater than the outer column 2 mm. At this time node materials economy and better mechanical properties.Through calculation, this kind of node form can effectively pass the beam load to column, stressing safety and reliability. |
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