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,
  1. 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

  1. 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
  1. 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.