Elastic Command for Sensitivity

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Both 2-D and 3-D elastic sections are available for response sensitivity computation.
section Elastic $secTag $E $A $Iz <$Iy $G $J>

$secTag unique section object integer tag.
$E Young’s modulus.
$A cross section area .
$Iz second moment of area about the local z-axis .
$Iy second moment of area about the local y-axis (optional, used for 3-D analysis).
$G shear modulus (optional, used for 3-D analysis).
$J torsional moment of inertia of section (optional, used for 3-D analysis).


For 2-D elastic sections, the sensitivity parameters can be: E, A, I.
For 3-D elastic sections, the sensitivity parameters can be: E, A, Iz, Iy, G, J.