The grid structure is a high-order statically indeterminate structure system. In the analysis of the plate type grid, it is generally assumed that the joint is hinged, and the external load acts on the joint according to the static equivalent principle, which can be calculated according to the space truss displacement method, that is, the hinged rod finite element method. Simplified calculation methods such as cross beam differential analysis, pseudoplate method, etc. can also be used for internal force and displacement calculation. The nodes of the single-layer shell-type grid are generally assumed to be just connected, and should be calculated according to the finite element method of the just-connected rod system; the double-shell shell type grid can be calculated according to the finite element method of the hinged rod system. Single-layer and double-shell grids can also be simplified by the pseudoshell method.
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