Mechanical Behavior of Single-Layer Two-Way Grid Cylindrical Latticed Shell with Out-of-Plane Tension Members
Single layer two-way grid shell with in-plane and out-of-plane tension members is a new type of single-layer latticed shell roof. This study treats the effects of tension member installation on the buckling load and strength of a single layer two-way grid cylindrical shell roof by the numerical method. The tension members are installed to stiffen the rigidity of a single layer two-way grid shell roof and improve its stability behavior. Tension member installation and placement pattern is focused as both diagonal members of two-way grids and out-of-plane stiffened members in a cylindrical surface. The diagonal member and the out-of-plane member are used to increase the in-plane and the out-of- plane rigidity of a single layer two-way grid shell, respectively. The tension member placement pattern, the load distribution patterns, the initial imperfections and the initial axial force are considered for the numerical calculation parameters. It is confirmed by the numerical analysis that the tension members in out-of-plane and diagonals caused the increase in the buckling and strength of two-way grid shell.
Parameters and Ratios of Metal Cylindrical Mesh Shells
Finite element modeling, calculation and analysis of metal cylindrical mesh shells are carried out. The choice of the surface topology is justified and the recommended ratios of overall dimensions are adopted. The criteria for determining the stability of the grid are given. The limits of permissible curvature and the main geometric parameters are obtained. The effect of increasing the rigidity and height of the structure on the work of the mesh surface is analyzed. Patterns of changes in nodal deviations and internal force factors of vulnerable areas of the shell are revealed. The results of changes in the shape and features of the critical deformation of the system are presented.
A new proportioning method for member sections of single layer reticulated domes subjected to uniform and non-uniform loads
Abstract This paper presents a new proportioning method for member sections of single layer reticulated domes based on linear buckling stress obtained from linear buckling analysis using geometric stiffness matrices. This method includes elasto–plastic behaviors and instability of the members and the global shell buckling. To confirm the validity of this method, firstly roller supported single layer reticulated domes subjected to uniform load are designed by the method and then it is discussed how the domes satisfy the required load conditions, and lastly it is verified by the inelastic buckling analysis. Also the buckling load and strength of single layer reticulated domes under non-uniform loads are presented with emphasis on how to apply the buckling axial stress expressed by the generalized slenderness ratio of members.