An exact method for obtaining the solutions for the bending moments, twisting moments and deflections of simply supported rectangular grids subjected to static concentrated loads applied at the nodes is presented in this paper. It is developed by employing the cyclic periodicity in two directions of the equivalent systems of the original grid structure. A simple example is worked out to demonstrate the accuracy of this method which is applicable to orthogonal grids subjected to nodal loads only at this stage but will be further developed to extend its applicability to other types of grids such as diagonal grids subjected to arbitrary loading.
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