Investigation On Static Stability And Seismic Response Of Keiwwit Single Layer Spherical Reticulated Shells

In recent years,single-layer reticulated shells have been widely used in major public buildings.Because of its beautiful shape,good streamlined,large span and many other advantages of architectural design designers of all ages.However,with the increasing size of the shell,the actual engineering design also appears a lot of problems plagued the designer,such as the stability of the shell in the force problem: a small displacement of the node will make the stability of the entire structure of the bearing capacity Greatly reduced;and then under the action of the earthquake,the shell of the internal force of the law and the overall force of the situation.Based on these problems,this paper takes Kewei Te single-layer spherical reticulated shell as the research object,from the static stability analysis and seismic response analysis of two aspects of systematic research.Based on the miads-Gen finite element analysis program,the static stability and seismic response of the single-layer spherical reticulated shells are analyzed.The concrete work is as follows:(1)Based on the three-dimensional grid type,K8-type Kewitt and the common three-dimensional reticulated shells,the geometrical nonlinear analysis was carried out.The results were analyzed and analyzed under different initial defect conditions The influence of the initial geometric imperfection and the proposed value are discussed according to the construction situation and the influence coefficient of the defect.(2)The static stability of each type of reticulated shell model is analyzed,and the buckling modes of the models are obtained and classified into three types of buckling.According to the calculated load-displacement whole process curve,the three kinds of instability modes are summarized and the detailed description is expanded.(3)The influence of the asymmetry of the load distribution on the ultimate bearing capacity of the reticulated shell is simulated and the influence of the stability performance with the change of these parameters is summarized.(4)The self-vibration characteristic analysis of the reticulated shell structure is carried out.Considering the combination of different modes,the response of the shell to the seismic action is analyzed,and the deformation of the reticulated shells in the vertical and horizontal Under the action of the internal force response to carry out theanalysis work,summed up the various types of internal force and static force of the internal force distribution and the proportion.It is pointed out that the vertical earthquake has a stronger effect on the structure than that of the earthquake,and the distribution of the internal force of the rod under the action of vertical earthquake is different from that of the horizontal earthquake.