Modeling Commands: Difference between revisions

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Modeling commands are commands added to Tcl to create the finite element model:
{{CommandManualMenu}}
#[[model command| model]]
 
#[[node command | node]]
The model or domain in OpenSees is a collection (an aggregation in object-oriented terms) of elements, nodes, single- and multi-point constraints and load patterns. It is the aggregation of these components which define the type of model that is being analyzed. The component classes, are as shown in the figure below:
#[[constraints commands]]
 
#[[mass Command | mass]]
<uml>
#[[uniaxialMaterial Command| uniaxialMaterial]]
package "OpenSees Model" #DDDDDD
#[[nDMaterial Command| ndMaterial]]
 
#[[section Command| section]]
abstract class Element
#[[element Command|element]]
Domain o- Element
#[[block Command| block]]
Domain o- Node
#[[region Command| region]]
Domain o- SP_Constraint
Domain o- MP_Constraint
Domain o- LoadPattern
</uml>
 
 
The following are the modeling commands that have been added to OpenSees interpreter to create these components of the finite element model:
 
*[[model command| model]]
*[[element Command|element]]
*[[node command | node]]
* '''SP_Constraint''' (single-point constraint), which prescribe the movement (typically 0) of a single dof at a node. There are a number of commands for creating single-point coonstraints:
** [[fix command | fix]]
** [[fixX command | fixX]]
** [[fixY command | fixY]]
** [[fixZ command | fixZ]]
* '''MP_Constraint''' (multi-point constraint), which prescribe that the movement of certain dof at one node are defined by the movement of certain dof at another node. There again are a number of commands for defining multi-point constraints.
** [[equalDOF command | equalDOF]]
** [[rigidDiaphragm command | rigidDiaphragm]]
** [[rigidLink command | rigidLink]]
*[[Time Series Command| timeSeries]]
*[[pattern Command|pattern]]
 
 
----
----
The following Misc commands are used to generate elements or modify properties of elements or nodes already in the model:
 
*[[mass Command | mass]]
*[[block Command| block]]
**[[block2D Command| block2D]]
**[[block3D Command| block3D]]
*[[region Command| region]]
*[[Rayleigh Damping Command|rayleigh]]
*[[ShallowFoundationGen]]
 
----
----
 
The typical element in OpenSees has the material nonlinearity and sometimes geometric nonlinearities
contained in other objects, materials and geometric transformations. Commands have been added to the interpreter to create these objects as well:
 
<uml>
package "Element Classes" #DDDDDD
abstract class Element
abstract class Material
abstract class UniaxialMaterial
abstract class NDMaterial
abstract class SectionForceDeformation
abstract class GeometricTransformation
 
Element o- Material
Element o- GeometricTransformation
 
Material <|-- UniaxialMaterial
Material <|-- SectionForceDeformation
Material <|-- NDMaterial
</uml>
 
 
#[[uniaxialMaterial Command| uniaxial Material]]
#[[nDMaterial Command| ND Material]]
#[[section Command| Section]]
#[[frictionModel Command | friction Model]]
#[[Geometric Transformation Command| geometricTransf]]
#[[Geometric Transformation Command| geometricTransf]]
#[[Time Series Command| timeSeries]]
 
#[[pattern Command|pattern]]
----
#[[Rayleigh Damping Command|rayleigh]]

Latest revision as of 17:26, 11 February 2011



The model or domain in OpenSees is a collection (an aggregation in object-oriented terms) of elements, nodes, single- and multi-point constraints and load patterns. It is the aggregation of these components which define the type of model that is being analyzed. The component classes, are as shown in the figure below:

<uml> package "OpenSees Model" #DDDDDD

abstract class Element Domain o- Element Domain o- Node Domain o- SP_Constraint Domain o- MP_Constraint Domain o- LoadPattern </uml>


The following are the modeling commands that have been added to OpenSees interpreter to create these components of the finite element model:

  • model
  • element
  • node
  • SP_Constraint (single-point constraint), which prescribe the movement (typically 0) of a single dof at a node. There are a number of commands for creating single-point coonstraints:
  • MP_Constraint (multi-point constraint), which prescribe that the movement of certain dof at one node are defined by the movement of certain dof at another node. There again are a number of commands for defining multi-point constraints.
  • timeSeries
  • pattern


The following Misc commands are used to generate elements or modify properties of elements or nodes already in the model:

The typical element in OpenSees has the material nonlinearity and sometimes geometric nonlinearities contained in other objects, materials and geometric transformations. Commands have been added to the interpreter to create these objects as well:

<uml> package "Element Classes" #DDDDDD abstract class Element abstract class Material abstract class UniaxialMaterial abstract class NDMaterial abstract class SectionForceDeformation abstract class GeometricTransformation

Element o- Material Element o- GeometricTransformation

Material <|-- UniaxialMaterial Material <|-- SectionForceDeformation Material <|-- NDMaterial </uml>


  1. uniaxial Material
  2. ND Material
  3. Section
  4. friction Model
  5. geometricTransf
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