Sometimes, the finite element model of part of a structure does not allow to obtain reliable estimates of connection loads. This is the case for example:
When RBE2 or RBE3 elements are used to distribute connection loads on a larger area of the model.
When very stiff and coarsely modeled parts are assembled together.
When thermo-elastic environments lead to unrealistic reactions in connections.
...
Then, bolt group re-distributions allow the production of smoother distributions of connection loads from an initial distribution produced by FEM solver.
The equations governing the redistribution of loads on a bolt group are presented here. The equations are inspired by similar equations developed in [eEL94] for the calculation of a solid motion.