Research On Long-span Narrow And Long Planar Concrete Honeycomb Space Grid Box Structure

With the development and progress of society,industrial and civil buildings in urban construction demand more and more single-layer and multi-storey large-span building structures with large space,large column network and large bay.The good three-dimensional mechanical performance of space grid box structure meets the application of large-span space structure.In this paper,the finite element analysis software ANSYS and Midas Gen are used to analyze the static and dynamic performance of the structure,as well as the time history analysis of comfort.This paper first introduces several calculation principles of hollow web sandwich plate of space grid box structure,and then introduces the force mechanism and lateral stiffness calculation of space grid box structure,which lays a theoretical foundation for the following research.In the research and analysis of static performance,the internal force distribution of the floor under the vertical uniform load is explored,and the influence of the honeycomb grid size,the height of the Vierendeel plate,the thickness of the upper surface concrete thin plate,and the section size of the upper and lower ribs,shear keys and side beams on the maximum span deflection of the floor is analyzed.In the analysis of dynamic characteristics,firstly,the basic theory of dynamic analysis is introduced,then the dynamic characteristics of honeycomb spatial grid box structure are studied,the vibration characteristics of the whole model are analyzed,the first ten natural frequencies of the whole model are given,and the influence of interlayer beam on the whole stiffness is discussed.Then,the vertical vibration characteristics of single-layer floor are studied by selecting the middle story structure,and the vertical vibration characteristics are described by modal diagram.The parametric analysis of the fundamental frequency of the floor is also carried out based on the relevant parameters of the static deflection parametric analysis,and the data are sorted out.In the final study of comfort analysis,the basic theory of comfort analysis and the evaluation standard of comfort are also introduced.The single-layer structure model is established,and the comfort time history analysis based on fixed-point excitation and walking route is carried out,And dynamic time history curve to show the comfort experience of honeycomb box structure in the use stage.Through the analysis,the conclusion is drawn that the honeycomb spatial grid box structure has good structural integrity,outstanding performance in threedimensional mechanical performance,and has high application value in the construction of large-span building structure.