Design And Stability Analysis Of Single Layer Reticulated Spherical Shell

In recent years, reticulated shell structure is a type of space structure which is widely usedin the building engineering. It is popular for the elegant and unique shapes. However, becauseof the large span, it is necessary to pay more attention to the stability problems of single layerreticulated spherical shell. This paper takes a single layer latticed dome with shell plates in thepractical engineering as the calculation analysis model. The finite element software ANSYS isused in the design and stability analysis of latticed shell structure. Three aspects are discussed,including components selection, buckling modes and the stability bearing capacity.First of all, a single-layer spherical reticulated shell structure is designed. For the structure,its reaction force, internal force distribution and deformation law are analyzed when it is underthe condition of seven kinds of load condition. The result of the analysis is summarized.Thereaction force is mainly under the control of the permanent load and live load; to a certainextent, the wind load reduces the reaction forced. The internal force distribution of thestructure is more regular. The bar is not only to bear axial force, but also to inherit the bendingmoment. The axial force is given priority to with compression and mainly distributed in radialbar; the bending moment including the in-plane bending moment and out-of-plane bendingmoment is mainly distributed in the ring bar. The deformation of the structure is small. Unevenload distribution is more adverse to the deformation control of the structure.Using the finite element model, observe the whole process of the change in structuralstability. It is considered that the influence of various factors on the performance of linear andnonlinear buckling. The linear buckling analysis is mainly analyzed the influence of initialdefects and load distribution on structural buckling mode. The results show that: for the overalltrend of Instability, the structure with initial defects is similar to the perfect structure. Incontrast, there is a change in the deformation position. The biggest displacement of theformer is in the third ring, but the latter is in the forth ring. Structural buckling mode isdifferent because of load distribution form. When load distribution is vertical cross half span,its buckling mode is similar to the load distribution in all across. It is the overall vertical buckling. When the load is anti-symmetric distribution, the buckling mode is characterized bylocal buckling some nodes are convex or concave. The whole structure is anti-symmetricbuckling. Nonlinear buckling analysis is mainly considering the influence of the initial defects,load distribution and rise-span ratio on bearing capacity of structure stability. Initial defectsreduce the stability bearing capacity of the structure. When the initial defects is l/300, thestructure stability bearing capacity is smallest, slumping30%compared with perfect structure;when the load distribution is half across and anti-symmetric, the stability of the structurebearing capacity is fell by30%and44%respectively. There is a corresponding increase instability bearing capacity with the increase of rise-span ratio.In this paper, the research on the design and stability analysis of single layer reticulatedspherical shell structure has certain reference value.