Theoretical Analysis Of Jointing Between Concrete-filled Square Steel Tubular Column And Composite Beam With U Shape Steel Plate Encased Concrete Based On Plastic Hinges Damage

Composite beam with U shape steel plate encased concrete is filled with concrete in the U shape steel beam, and consists of T section composite beam and slabs. There were many shear bolt nails on the top flange of the composite beam with U shape steel to ensure that the steel beam and concrete work together. By the cooperation with steel and concrete, stiffness of the beam becomes larger, stability becomes stronger. But the complexity of the nodes limited its development and application.Based on the research of our group, this paper describes two nodes which is called jointing between concrete-filled square steel tubular column and composite beam with U shape steel plate encased concrete,such as the reinforced through the column model (GBGT-1) and the reinforced cut off model (GBGT-2),and this two nodes. By utilizing finite element analysis software ANSYS, it found that there are two damage modes on the static loads. It found that the value of the carrying capacity of the two nodes is quite, and hysteresis curve shape is quite, and the ductility and energy dissipation capacity of the two nodes is quite. The results showed that the two nodes showed essentially the same mechanical performance.By utilizing finite element analysis software ANSYS, it carried a lot of varying parameter analysis and comparison. It explores the factors affecting the carrying capacity and seismic performance such as the high U-shaped steel girder beams outsourcing, outsourcing wall thickness of the U-shaped steel beams, composite beams floor height, floor width composite beams, composite beams concrete strength, the combination of negative moment reinforcement beam diameter, axial compression ratio. The results showed that outsourcing U-shaped steel beam height, steel beams and floor height on the wall thickness of the elastic stiffness node skeleton curve is large, less impact on the strengthening phase stiffness. Negative moment reinforcement diameter, width and slabs of concrete composite beam intensity on the node skeleton curve elastic stiffness less affected; stiffness greater impact on the strengthening phase. When the plastic hinge beam end damage, no influence of axial compression ratio of the skeleton curve.