Research On Punching Shear And Deformation Behavior Of Reinforced Concrete Flat Plate Jointed With Specially Shaped Column

Flat plate column structure is a kind of building structure system.The structure is composed of flat plate and column directly,and it has no beam.In this paper,OpenSEES is used to build the refined grid beam model and analyze the punching shear performance and deformation of the specially shaped column connection of flat plate column structures.Through the simulation and analysis of 19 specimens,the simulative results are in good agreement with the test results.The influence of section form of the column,the contact area between the column and the flat plate,the strength of concrete,the reinforcement ratio of the flat plate and other parameters on the punching shear performance and deformation of the connection are considered in one time.Providing a theoretical reference for the design of specially shaped column connection in the reinforced concrete flat plate.(1)Chinese code GB 50010-2010 is compared with three foreign design codes(ACI318-08,EC2,BS 8110)combining with experiments.The results were different.The results are relatively conservative by Chinese code.Specially shaped column specimens have a high punching shear capacity and ductility.(2)This paper established refine grid beam model.Nonlinear finite element analysis of 19 reinforced concrete flat plate with specially shaped column middle connections is carried out based on OPENSEES.The key parameters are verified and checked.The simulative results are in good agreement with the test results.(3)The section critical perimeter which was proposed by Liu Wenting was tested in this paper.The four kinds of specially shaped column(cross,T-shaped,L-shaped,nonsquare rectangles)was researched to provide the reference to revise specification.Figure51;Table7;Reference 60...