Research On Circular Plane U-shaped Steel-concrete Composite Honeycomb Space Grid Box Structure

As a new structural system appeared in the 1990 s,Vierendeel Sandwich Panel has been widely used in large-span space buildings.Practice has proved that it is a safe,economic,applicable and beautiful structural form.Honeycomb concrete Vierendeel Sandwich slab floor is another new type of Vierendeel Sandwich slab proposed by academician Kejian Ma 's team in recent years.The element grid is changed from the original quadrilateral to the regular hexagon,and the crack problem caused by excessive deflection can be avoided by wrapping the U-shaped steel plate around the lower rib beam in the middle of the span.The research object of this paper is a proposed circular plane three story gymnasium.The structural scheme adopts U-shaped steel-concrete composite honeycomb Vierendeel Sandwich plate box structure.The vertical and horizontal members are mainly studied.In this paper,the formulas of lateral stiffness and lateral displacement of the space truss frame with box structure are derived,and the differences of mechanical properties between the two structures are summarized by comparing the general frame structure.The pushover analysis of the two structures proves that the energy dissipation effect of the interlayer small section beam is obvious;The continuous analysis theory of equivalent sandwich plate model and the simplified practical calculation theory of sandwich plate model in practical engineering are introduced;The finite element model of the new floor is established and analyzed under static load.The deformation characteristics and internal force characteristics of the floor are studied,and the relevant factors affecting the vertical deformation of the new floor are found out;The vertical vibration characteristics and the comfort analysis under the excitation of human induced load are studied.The main factors affecting the vertical acceleration of the floor are analyzed by parameterization,and the effective method to adjust the comfort of the new floor is found.The research results show that the lateral stiffness of the new structure is stronger than that of the ordinary frame structure,the floor has greater bearing capacity,the low order vibration modes of the floor vertical vibration are in the form of integral vibration,and the fundamental frequency and peak acceleration of the floor can meet the requirements of domestic and foreign codes for comfort evaluation.The new box structure has beautiful appearance,uniform and reasonable overall stress,which is worthy of further study and has a good prospect of engineering application.