Overview of Design Responses

For defining design responses several general settings can be made. These are described in this section.

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DRESP

All design responses always consist of one single scalar value. So although you reference a node or element group in the DRESP definition, Tosca Structure will use a group operator (GROUP_OPER) to either use the maximal (MAX), minimal (MIN) or sum of the values (SUM) to combine the responses to a single value.

Although Tosca Structure can handle more load cases within one design response, it is best practice to use one design response for each load case. This is done with the item LC_SET:


LC_SET = <analysis_type>,<loadcase_nr>,<substep>




DRESP
  ID_NAME    = .....
  DEF_TYPE   = .....
  TYPE       = .....
  VAR_OPER   = .....
  UPDATE     = .....
  GROUP_OPER = .....
  EL_GROUP   = .....
  ND_GROUP   = .....
  ELEM       = .....
  NODE       = .....
  LC_SET     = .....
END_

Most entities have default values.

Note: For design responses that are based on nodal or element values (for example, displacement or stresses) and use GROUP_OPER = MAX | MIN, it is possible to log the node or element with the maximum or minimum value, respectively. For this, define a copy of the desired design response with a different ID, but not reference it in the # OPTIMIZE command. Then, the TOSCA.out file contains the node or element information in addition to the design response value. Be aware that for large models, this might have an impact on the performance as well as storage sizes.