Nonlinear Analysis Of Behaviors Of Steel-Concrete Composite Beams With Slipping

Steel and concrete composite beam possesses many advantages, such as high strength, high stiffness and good ductility. The rapid progress has been gained in research of composite beam at present, but many questions still need to be studied adequately, especially to the research about steel-concrete composite beam's behaviors with slipping and prestressed steel-concrete composite beam. As a current structural analysis method, finite element analysis can be used to compute composite beams with many factors and educe great data. So it is necessary for us to use finite element mathod to analyse steel-concrete composite beam with slipping.Based on Nonlinear analysis theory and the material properties, nonlinear finite element model of steel-concrete composite beam and prestressed steel-concrete composite beam is done in this paper, as for steel beam and concrete slab, volume units Solid45 and Solid65 are used; the prestressed steel bars are adopted line units Link8, and the prestress are defined through applying the beginning temperature; slip between concrete slab and the steel beam are considered by adopting the spring unit Combine39.The results of finite element received through calculation analysis and test research are similar. It proves that the finite element analysis can be used instead the analytic method of steel and concrete composite beams.19 steel-concrete beams and 25 prestressed steel-concrete composite beam are studied. In the loading process, all composite beams pass through elastic phase, elastic-plastic phase and destruction phase.All specimens fail in bending and display good integrality.Analysized by nonlinear finite element mathod, bearing capacity, displacement, slipping between concrete slab and the steel beam are received through calculation of the two types of composite beams in this paper. This paper also provides composite beam's influence caused by different factors, such as concrete's strength, prestressed steel bar's numbers and presstress, composite beam's size and the distance of anti-shear connection.