This command is used to construct a SectionAggregator object which aggregates groups previously-defined UniaxialMaterial objects into a single section force-deformation model. Each UniaxialMaterial object represents the section force-deformation response for a particular section degree-of-freedom (dof). There is no interaction between responses in different dof directions. The aggregation can include one previously defined section.
|section Aggregator $secTag $matTag1 $dof1 $matTag2 $dof2 ....... <-section $sectionTag>|
|$secTag||unique section tag|
|$matTag1 $matTag2 ...||tag of previously-defined UniaxialMaterial objects|
|$dof1 $dof2 ...||the force-deformation quantity to be modeled by this section object. One of the following section dof may be used:|
|P Axial force-deformation|
|Mz Moment-curvature about section local z-axis|
|Vy Shear force-deformation along section local y-axis|
|My Moment-curvature about section local y-axis|
|Vz Shear force-deformation along section local z-axis|
|T Torsion Force-Deformation|
|$sectionTag||tag of previously-defined Section object to which the UniaxialMaterial objects are aggregated as additional force-deformation relationships|
section Aggregator 2 2 Vy -section 4; # create new section with IDtag 2, taking the existing material tag 2 to represent the shear and adding it to the existing section tag 4, which may be a fiber section where the interaction betweeen axial force and flexure is already considered.
Read if you're using moment-curvature in beamWithHinges element to represent moment-rotation, or vice versa
Code Developed by: Micheal H. Scott, Oregon State