Example: Minimizing the Energy Stiffness Measure

The task for this example is to maximize the stiffness by minimizing the energy stiffness measure subject to a mass constraint of 35%.

This task shows you how to:

Varying prescribed displacements are assigned as shown in the figure below:

Minimizing the Energy Stiffness Measure in Tosca Structure.gui

  1. Choose Command > DRESP.
  2. Choose Type > ENERGY_STIFF_MEASURE.
  3. Select ALL_ELEMENTS in the dropdown menu Elementgroup.

  4. To choose load case click Add LC. In the field Load case number, enter 2.
  5. Choose Command > OBJ_FUNC.
  6. Click Add Dresp and choose the previously defined design response for energy stiffness measure:

Tosca Structure Parameter File

The resulting command in the parameter file look like follows: 

DRESP
  ID_NAME               = ...
  DEF_TYPE              = SYSTEM
  TYPE                  = ENERGY_STIFF_MEASURE
  EL_GROUP              = ALL_ELEMENTS
  GROUP_OPER            = SUM
END_