This paper describes a method of structural analysis whereby extra constraints are applied to the structure to keep the effects of any applied forces within a part of the structure so small that it may be readily analysed. For the constrained structure, one computes the stiffness matrix by imposing the simple unit motions called for and calculating the forces at the constraints. A judicious choice of constraints makes the calculation of the elements of the stiffness matrix easy and may make most of them zero. The excess reactions may then be removed by a partitioning and partial inversion process.
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