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A method of analyzing a structure containing a rigid body. The method defines a set of displacement factors to be imposed on a structure model. The method is used for calculating structure stress defining equations including a load vector representing externally applied forces on the structure model

A method of analyzing a structure containing a rigid body. The method defines a set of displacement factors to be imposed on a structure model. The method is used for calculating structure stress defining equations including a load vector representing externally applied forces on the structure model. The method modifies the load vector to compensate for rigid body deformation and evaluates stresses on the structure model from data generated from the structure stress defining equations.

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[ What is claimed is:] [1.] A method for analyzing a structure having a deformable rigid element, the method comprising the steps of:defining a set of displacement factors to be imposed on a structure model;calculating a set of structure stress defining equations based on said set of displacement fa

[ What is claimed is:] [1.] A method for analyzing a structure having a deformable rigid element, the method comprising the steps of:defining a set of displacement factors to be imposed on a structure model;calculating a set of structure stress defining equations based on said set of displacement factors, wherein said structure stress defining equations include:provision for calculating a load vector representing externally applied forces applied to the structure model;provision for inputting a value of a known magnitude of rigid element deformation experienced by said structure before said load vector is applied;provision for modifying the load vector to compensate for said known magnitude of rigid element deformation experienced by said structure before calculating stresses on the structure model resulting from said load vector;applying the set of displacement factors to the structure stress defining equations;outputting data generated from said step of applying the set of displacement factors to the structure stress defining equations;evaluating stresses on the structure model; andwherein said structure stress defining equations include a formula: EQU {u.sub.m }=[R.sub.m ].sup.-1 {.delta..sub.G }+[G.sub.m ]{u.sub.n }(4) re:[R.sub.m ].sup.-1 is the inverse of a partition of a dependent multi-point constraint co-efficient matrix;{.delta..sub.G } is a user defined displacement term;[R.sub.n ]=is the partition of the multi-point constraint coefficient matrix; and{u.sub.n } is an independent set of displacements.