## D. Analysis of an Elastic Structure Subjected to a Prescribed Displacement (STA3)

In this analysis, the matrix equation to solve is identicalto that of STA1:

[Kuu] U = F

The user provides the prescribed displacement on given nodes. The code computes the entire displacement field U. It is essential that the boundary conditionseliminate rigid body modes. Only one loading case can be solved at a time. Taking internal losses into account does not make physical sense in thisanalysis and thus is not possible.

Displacements are prescribed using the EXCITATIONS entry. The matrices are assembled and stored in a file by columns. Gaussianalgorithms are used to solve the problem, in single or double precision. It isalso possible to apply forces (STA1) and prescribedisplacements at the same time (STA3).