Imposed nodal deformation occurs when a node is displaced despite a defined support. This is the case of a column settlement, for example.
To make the imposed deformation effective at nodes, it is necessary to support the nodes in the direction of the deformation. The imposed deformation can be defined for each of the six degrees of freedom, but only in the direction in which the node has a support.
Imposed displacements have a positive effect if pointing in the direction of the positive axes of the respective coordinate axis system. Positive imposed rotations act right-handed about the corresponding positive axis of the nodal support.
Usage in Program
In RFEM and RSTAB, you can define the imposed deformation as imposed displacement or imposed rotation.
To define the imposed displacement, you need to specify the X, Y, and Z components of the displacement vector. If there is the support rotation, the components refer to the rotated support axes.
The imposed rotation also requires the definition of the X, Y, and Z components of the rotation related the coordinate system of the support.