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Combination cases

It is often useful to combine results from more than one analysis case. This is achieved by defining combination cases, which combine a number of factored analysis cases (e.g. 1.4A1 + 0.8A3).

Note combinations are only valid for linear solutions and should not be used to combine results from nonlinear analyses. A mode details description is given in Working with the program: Combination cases and Working with the program: Enveloping in GSA

Definition​

Name​

The name is only used as a convenient way of identifying a combination case.

Description​

Defines the analysis cases and factors that constitute the combination case (e.g. 1.4A1 + 0.8A3). An envelope of any number of cases can be specified as part of the combination, for example to view the worst case results for a number of cases. See Cases in Working with the program for details of the syntax for combination cases.

User note​

The note is not used by the combination case but allows a note to be stored against the combination case.

Factors tab​

In the case of a simple combination (e.g. 1.4A1 + 0.8A3) these are the factors that apply to the particular analysis cases.

Notes​

Append to description​

To assist in creating the case description the append options allow the user to select analysis cases, other combinations cases or lists (of cases) or a list of cases to envelope and add to the description. The cases selected are then appended to the description.

Expand​

A combination case may refer to another combination case that is defined as a simple combination. If this is the case the expand to analysis cases will convert the description to one in terms of analysis cases only.