modify global stiffness for topology optimization

[zenia]

Hi,
I am new in FEAP and am trying to implement a topology optimization routine.
I have already written a module in umacr and elmt for the optimization itself. But now I need to modify the global stiffness matrix, so that the displacement calculation can run under the "optimized" topology.
How can I modify (or even find) the global stiffness matrix?

Thanks in advance.

[FEAP_Admin]

Assuming that you have solved the equations of motion in order to perform the optimization step, then the unfactored stiffness matrix is no longer available.

If you are performing topology optimization, then I would suggest imposing your topological changes and then re-forming the equations (using FORM).