Stability Analysis Of Three-way Grid Shell Structure

In recent years,single-layer reticulated shell structure has been used in many new engineering structures because of its advantages of beautiful shape,light weight and good performance.Three-way grid-type reticulated shell is widely used in practical engineering,but the research on its many properties has not been carried out,which causes the lag between principle and practice,the reticulated shell works well,For this reason,this paper takes the roof of a large flow of people in Beijing,that is,three-way grid-shaped reticulated shell structure as the research object,based on the Midas-GEN finite element analysis software to establish the model,and the static,overall stability and seismic response of the reticulated shell structure are analyzed.First,the development of spatial structure is briefly described,and the development process and research status of its application,stability and seismic influence research at home and abroad are combed,and the structure is classified according to the constituent elements of its members,and the application advantages of reticulated shell are described.Secondly,the model is introduced by the Midas-GEN,and the static analysis of the reticulated shell under the combination of various loads is carried out by consulting the relevant codes,including the internal force distribution of different types of members,the reaction force of the base and the change of vertical displacement.Then,the stability of the three-way mesh-type reticulated shell structure is analyzed,and its calculation principle is derived.The buckling coefficient of the reticulated shell structure is obtained by eigenvalue buckling analysis,and the shape of its buckling mode is described.On this basis,geometric nonlinear analysis,double nonlinear analysis and nonlinear analysis under different load distribution conditions and several initial defects are carried out.From the analysis and comparison of these data results,the effect of these factors on the bearing capacity of the structure can be obtained.Finally,the self-vibration analysis of the three-direction mesh-type reticulated shell structure is carried out,and the internal force and the deformation of the three-way mesh-type reticulated shell analyzed.For this structure,the effect of horizontal earthquake on reticulated shell is stronger than that of vertical earthquake,and the internal dynamic force distribution of horizontal and vertical earthquakes is different.The research on this kind of reticulated shell can provide some reference for the following similar reticulated shell structure.