Structure Optimization And Seismic Performance Of Single Spherical Shell Of Geodesic

Dome has a beautiful architectural style, whether in architecture, facade, or type body. It can give designers the creative freedom to the full. shape can not be achieved with the grid structure, almost all the dome structure can do. This structure not only can performance static beauty,but also dynamic beauty by plane and cross cutting and the grid, supporting such changes and pole. Now, dome structure has been widely used in sports buildings, airport buildings, exhibition halls, industrial plants and other kinds of buildings.The spherical shell is a reticulated shell form which is the most widely used in China. Single spherical shell's mechanical finite element model is the spatial beam unit, and its capacity depends not only on the strength of rods, but also on the overall stability and local stability of network shell structure. In the design process of the single-layer reticulated shell structure, strength, rigidity, stability and geometry restrictive conditions must be taken into account. As well as, each bar should in line with the existing specifications and models, in a word, the optimization design of reticulated shells is kind of discrete variables structure optimization design problem.This paper studies the single-layer spherical shell of geodesic optimization problem. First, we use finite element analysis software ALGOR on geodesic spherical shell layer for static characteristics.From different spans a different span ratio, concentrated load, and different boundary conditions on the single-layer spherical shell of geodesic force and displacement characteristics of characteristics have been studied to prepare for the next optimization.Then, shape optimization of dome structure of the two algorithms accounted for the characteristics of single-layer spherical shell of geodesic dome in this paper. FORTRAN language is adopted for writing program about the Sequential two-level algorithm of dome section optimization, and connect to finite element analysis software named ALGOR. Through the different span across different loss ratio, the different mesh density of the single geodesic spherical shell of the optimization analysis we verify the validity and reliability. The next layer we used the above algorithm for geodesic spherical shell section optimum design, and obtained the optimal shell span ratio, the range of mesh. These studies have a certain value of engineeringIn addition, this article does dynamical analysis of single-layer spherical shell of geodesic which is of different parameters, of different span, load and cross-over, to obtain the characteristics of self oscillation and the regularity of seismic response. During the earthquake response analysis, we study the distribution of displacements and internal forces. We propose to conduct multi-dimensional engineering design seismic response analysis, especially for the shell edge and the main part of the bar ribs. Therefore, in the design safety factor should be increased.