Research And Application Of A Large-span Rectangular Plane Four-slope Concrete Hollow Grid Structure

The Large-span rectangular plane(Lx/Ly>1.5)four-slope vierendeel grid concrete roof structure is a new type of large-span spatial grid roof structure proposed by Academician Ma Kejian,which has many advantages such as reasonable stress,large span and beautiful national appearance so that it can be widely used in large-span civil buildings.This paper,building the overall model and roof model by the use of finite element software ANSYS15.0,analyzes and researches the vierendeel grid roof structure of four-slope concrete,then gets the mechanical properties of vierendeel grid roof structure of four-slope concrete,which provides a theoretical basis for the design and research of this structure in the future.This paper,through the introduction of the current domestic and oversea situation of the development of large span structure,expounds the main types of large-span roof construction,then points the vierendeel sandwich plate structure in the application of large span structure,thereby introducing the national style large-span rectangular plane(Lx/Ly>1.5)Vierendeel grid concrete roof structure proposed by scientific research personnels.In this paper,structure model has three layers,floors adopt vierendeel sandwich plate structure,roof adopts the combination structure of vierendeel sandwich plate four-slope vierendeel grid.Though using the finite element method with software to analyze it,the contents have three parts including the size performance research,the static performance analysis and the dynamic performance analysis of the Large-span rectangular plane(Lx/Ly>1.5)four-slope vierendeel grid concrete roof structure.Firstly,with the use of the finite element software ANSYS15.0,study the dimensional performance of the model structure,determine the design parameters,load conditions,the section size of beams and columns,and make parameterized analysis of the influence about roof grid height,column size and beam size on the vertical deflection.Secondly,on the basic assumption basis of finite element,analyze the static performance of the model structure including the internal force analysis of bending moment,the internal force analysis of axial force and the internal force analysis of shear force.Then,analyze the dynamic performance of the model structure,mainly including the modal mode analysis and natural vibration frequency analysis of the first twelve order of the structure,and the parametric analysis of the fundamental frequency of the four influencing factors including the section of the frame column,the section of the shear bond,the section of the ventral pole and the section of the chord.Finally,discuss on the mobile assembly of roof structure.Researches show,if the national style of large-span rectangular plane(Lx/Ly>1.5)four-slope vierendeel grid concrete roof structure size accords with the related research design,it can not only have beautiful architectural design effect,inheriting Chinese aesthetic culture and conform to concept of cultural self-confidence but also have good static mechanical properties and dynamic mechanical properties.