This paper proposes two numerical models for arbitrary quadrilateral panels, which are the generalisation of their counterparts for rectangular panels, presented in Refs. 3 and 4. The five force model is proved adequate to represent any state of equilibrium of a flat quadrilateral panel, subjected to nodal forces. The four-force model is found useful for warped panels through the investigation on the influence of curvature on flexibility of a panel. A six /four-bar assembly is also proposed as a substitute for the models to simplify the analysis of clad cable net structures.
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