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6.1.2 Relative Boundary Conditions
Some boundary conditions can be defined as relative boundary conditions. This means that the corresponding conditions will be applied to the final configuration of the previous step and not to the original reference configuration. For example, if a prescribed displacement is defined as relative the displacement will be taken with respect to the positions of the final configuration of the previous step. This makes it possible to switch between load and displacement controlled boundary conditions in multi-step analyses.