Aggregator

• Sensitivity_Command_Manual
  • General Commands
    • reliability
    • parameter
    • addToParameter
    • updateParameter
    • sensitivityIntegrator
    • sensitivityAlgorithm
    • recorder
  • Material Commands
    • uniaxialMaterial
    • nDmaterial
  • Section Commands
    • Fiber
    • Elastic
    • Aggregator
  • Element Commands
    • dispBeamColumnWithSensitivity
    • quadWithSensitivity
    • bbarBrickWithSensitivity
  • Constraint Commands
    • Transformation

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This command is used to construct a SectionAggregator object which groups previously-defined UniaxialMaterial objects into a single section force-deformation model.

section Aggregator $secTag $matTag1 $string1 $matTag2 $string2 …… <-section $sectionTag>

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$secTag	unique section object integer tag.
$matTag1, $matTag2 …	previously-defined UniaxialMaterial Objects.
$string1, $string2 …	force-deformation relations corresponding to each section object. One of the following strings can be used.
P	axial force-deformation.
Mz	moment-curvature about section local z axis.
Vy	shear force-deformation along section local y-axis.
My	moment-curvature about section local y axis.
Vz	shear force-deformation along section local z-axis.
T	torsion force-deformation.
$Iy	second moment of area about the local y-axis (optional, used for 3-D analysis).
<-section $sectionTag>	specifies a previously defined Section object (identified by the argument $sectionTag) to which these UniaxialMaterial objects are added to define a new Section object.

The ‘section Aggregator’ command does not introduce additional sensitivity parameters. However, sensitivity parameters can be defined for each force-deformation relation used in the section aggragator.