Parameter Command

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In DDM-based FE response sensitivity analysis, the sensitivity parameters can be material,
geometry or discrete loading parameters. Each parameter should be defined as:
parameter $tag <specific object arguments>

$tag integer tag identifying the parameter.
<specific object arguments> depend on the object in the FE model encapsulating the desired parameters.

Note: Each parameter must be unique in the FE domain, and all parameter tags must be numbered sequentially starting from 1.


For example,
  • To identify the elastic modulus, E, of the material 1 at section 3 of element 4, the <specific object arguments> string becomes parameter 1 element 4 section 3 material 1 E
  • To identify the elastic modulus, E, of elastic section 3 of element 4 (for elastic section, no specific material need to be
defined), the <specific object arguments> string becomes:

parameter 1 element 4 section 3 E

  • To parameterize E for element 4 with material 1 (no section need to be defined), the <specific object arguments> string
simplifies as:

parameter 1 element 4 material 1 E

Notice that the format of the <specific object arguments> is different for each considered element/section/material. The user is : referred to the corresponding section of this manual for the specific set of parameters and the relative <specific object
arguments> format.