Analysis And Research On Shear Keys Of Two Types Of Concrete Hollow Sandwich Plate

With the increasing demand from the public for the use of large public buildings and to enrich the forms of large-span concrete floors,Professor Markjian proposed an open-web sandwich plate structure system based on open-web grid structures.This structure has the advantages of beautiful and novel design,good overall integrity,high stiffness,good economic performance,and wide applicability.After years of development,different forms of open web sandwich plates have been derived,including orthogonal layout,orthogonal oblique layout,and honeycomb layout.In order to further improve open-web sandwich plate structure system,this paper takes the first floor of a proposed civic activity center as the engineering background,and uses finite element software to compare and study the static performance of orthogonal and open-web sandwich plate floors.By adjusting the height of upper(lower)ribs,shear key height to explore the internal force changes of the two types of floors under the influence of different parameters,analyze and evaluate the similarities and differences in mechanical properties of the two types of open web sandwich panel floors,and compare the advantages and disadvantages of the two.Then,cross shaped and "Y" shaped shear key solid models are extracted from the overall floor model,and structural parameters such as concrete strength,longitudinal reinforcement ratio,and stirrup reinforcement ratio are changed to obtain the impact trend of different structural parameters on the shear bearing capacity of the shear key.Finally,based on the skeleton curve,energy dissipation coefficient,and ductility coefficient,the differences in the hysteretic performance of the two shear keys under cyclic loading and the degree of influence of structural parameters are discussed.It provides a certain reference value for the design and research of orthogonal and honeycomb concrete open web sandwich plates.