Study On Hysteretic Behaviors Of The Steel-concrete Composite Deep Beams

Steel frame and steel frame filled with shear wall reflect two endpoints of the changes of the structural stiffness. The increase of stiffness is mutation. Steel frame filled with steel– concrete composite deep beams can meet the requirements of two endpoints and can achieve a wide range of stiffness graded AM. Composite deep beams are composed with steel plate and concrete slab which connected by high strength friction grip bolt. Composite deep beams have the same placement with shear walls in frame structure. By changing width of the deep beam, we could have different resistance to lateral displacement stiffness to meet stiffness requirements. By using different steel and concrete, we could achieve different strength, ductility and energy dissipation capacities. Lateral precast reinforced concrete plate can stop buckling of steel plate. Steel deep beams installed without stiffening rib. Lateral precast reinforced concrete plate and steel plate are connected with bolts. Steel plate bears the lateral loads while reinforced concrete plate doesn't bear any lateral loads. The reinforced concrete plate provides fire protection to steel plate. In addition, when lateral load or seismic force act on Composite deep beams, they are under bending and shearing deformation. They are different from shear walls which are under pure shearing deformation. These features help developing plastic property as well as increasing the ductility and energy-intensive capacity. Composite deep beams are flexible layout and they are easy to the aisle and window layout. They can be used to the new structure also they can be used for structural reinforcement. So they have theoretical research value and broad application foreground.Firstly, analyzing the study actualities about the deep beams around the world, the development and the behavior of steel–concrete composite deep beams are introduced. Based on this, the stability analysis of deep beam is carried out, and the structure conditions are put forward.Next, nonlinearity is introduced in the contact analysis by finite element software ANSYS to precisely simulate the work process of the deep beam. The thickness of the steel plates and concrete slab, the concrete intensity, the ratio of reinforcement and the bolt form, which affect the performance of the deep beams are analyzed to some extent.Thirdly, typical structural elements are putted to buckling analysis. Then the results are compared with those from hysteresis analysis by finite element software in order to proof the correctness. The final results indicate that those two have a better match. So the results from analysis by finite element software can be used safely.