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

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 the requirements of two endpoints and can achieve a wide range of stiffness gradient amplitude modulation. 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, Composite deep beams are flexible layout and they are easy to the aisle and window layout. They can be used to the new structure as well as 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. In this paper, low cyclic loading test method is employed to study on the experiment of two piece of Composite deep beams of different depth-width ratio. By analyzing the hysteretic loops, skeleton curve, distribution of stress, deformation behavior, ductility coefficient and the energy dissipation coefficient of each specimen, we can get the influence of different depth-width ratios Composite deep beam on hysteretic behaviors.Next, nonlinearity is introduced in the contact analysis by finite element software ANSYS to precisely simulate the work. By comparing with the results of low-cycle loading test, The final results indicate that those two have a better match. So the results from analysis by finite element software ANSYS can be used safely. Then apply the nonlinearity method to analyse series of parameters which can influence the performance of Composite deep beams structure system for getting the impact law of depth-width ratio, depth-thickness ratio of the steel plates and concrete slab, the intensity of steel plates and concrete slab, the ratio of reinforcement and the bolt form.Base on the low cyclic loading test data, it can obtain the restoring force model by fitting the skeleton curve and stiffness of each load through test data for elastoplastic analysis.