Research On Slabcomposite Effect And Mechanical Behavior Of Steel-concrete Composite Frame

Steel-concrete composite frame can satisfy the contemporary structure of the building in height,span and function and other requirements,which has been widely applied to China's multilayer and high-rise buildings.It has high application and research value.So far,researchers have done a lot of experimental studies and theoretical analysis on the composite frame at home and abroad,which has accumulated a wealth of experiences and results.But there are few researches and analysis considering the interaction of frame composite floors and the internal force distribution of the corresponding component in related studies Considering the vertical load of the slab frequently while ignoring the combination of concrete slabs in the internal force analysis of the composite frame.Under the horizontal load,study on combined effect of concrete slab are only qualitative analysis.There is little research on the specific stiffness contribution of the concrete slab to participate in the interaction of the floor,and there is lack of unified understanding.In addition,the research on the frame composite joints is mainly focused on the mechanical behavior of the joints under different structural forms,while the research on the influence of the stress and deformation of the joints of different structural joints is less.In view of the above research status,this paper bases on the actual project as the background,which selects the typical composite frame structure as the research object,and uses ANSYS finite element software to simulate the analysis.First of all,the rule of internal force distribution of the two models is revealed under the horizontal load through contrastive analysis of steel frame and composite frame integral model.The influence of the combination of concrete flange on the components of the frame is studied emphatically and the failure mechanism of the combined frame is illustrated.Secondly,The specific contribution value of the concrete flange when the calculation of the single frame is analyzed through the establishment of a more sophisticated single-portfolio model.At the same time,The keystone is to investigate the composite effects of concrete plate for the different types of shear connections,the thickness of concrete flaps,the presence or absence of vertical load and the different structural forms of the node area.At last,a theoretical method for calculating the yield tensile bearing capacity of the flange of the square steel pipe is proposed for the steel bar connected directly to the square steel pipe column without the inner partition and simulation verification is carried out.Study on the combined action of composite frame concrete plate and the tensile property of the steel pipe column flange has certain guiding significance for the design of the combination floor and the node in the actual project,which can provide reference for the engineering practice.