Static And Dynamic Performance Analysis And Shape Optimiz Ation Design Of Hybrid Ellipsoid Reticulated Shell

In recent years,the rapid development of China’s construction technology,larger span,demanding higher spatial structure has been widely used.The reticulated shell is favored by people because of its beautiful shape,various functions and reasonable mechanical properties.But along with the increasing of shell structure,people are not satisfied with the traditional direct single dome,now more inclined latticed shell structure with different structures,their respective characteristics,and meet the architectural aesthetics of hybrid shell economic and reasonable came into being.The new hybrid force transmission shell structure is reasonable,the geometric structure is simple,and the disadvantages of hybrid ellipsoid reticulated shell is improved near Geiger,Schwedler single ellipsoidal shell vertex stress concentration and connecting rods more,make the grid distribution,structure stress performance to improve.The main work of this paper is:1 introduction of the ellipsoid equation and proportional coefficient of hybrid t,determine the coordinates of hybrid ellipsoid point,according to the specific rules of rib cloth rod shell,with the APDL parametric design language using ANSYS software,the parametric design of hybrid ellipsoid reticulated shell,given different macrohybrid ellipsoid and the geometric parameters related to under the surface of the shell structure model,in order to get the design method of the shell parameters.2 according to the hybrid ellipsoid space rectangular coordinate system of equations,determine the spatial coordinates of hybrid ellipsoid points,and then according to the distance formula between two points,calculate the hybrid ellipsoid of arbitrary bars and geometric parameters of the relationship,relationship between the two categories of six kinds of hybrid derived ellipsoid reticulated shell the length ofthe bar and the macroscopic geometric parameters,to ensure the construction project of the length of the bar,Nx and vector high control requirements.3 using the ANSYS software,the static analysis of the two kinds of hybrid ellipsoid reticulated shells of the six types is carried out,and then compared with the traditional single ellipsoid reticulated shell.Then in the same span,by changing the height,the total radial node cycles upper radial node cycles ratio,hoop area fraction,to force the best performance-Kiewitt rib ring hybrid ellipsoid reticulated shell shape optimization design,so as to obtain the best matching parameters,save the project cost.4 select a superior-Kiewitt ribbed ellipsoid reticulated shell of 6 types of hybrid ellipsoid reticulated shell static performance,analyze the response under seismic load on the analysis of its vibration characteristics,and the influence of various parameters on the shell structure of earthquake frequency.