Multi-Support Excitation Pattern: Difference between revisions
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{{CommandManualMenu}} | |||
The Multi-Support pattern allows similar or different prescribed ground motions to be input at various supports in the structure. | The Multi-Support pattern allows similar or different prescribed ground motions to be input at various supports in the structure. | ||
In OpenSees, the prescribed motion is applied using single-point constraints, the single-point constraints taking their constraint value from user created ground motions. | In OpenSees, the prescribed motion is applied using single-point constraints, the single-point constraints taking their constraint value from user created ground motions. | ||
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ImposedMotionSP --- GroundMotion | ImposedMotionSP --- GroundMotion | ||
SP_Constraint <|-- ImposedMotionSP | SP_Constraint <|-- ImposedMotionSP | ||
GroundMotion o- | GroundMotion o- TimeSeries | ||
</uml> | </uml> | ||
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{| style="background:yellow; color:black; width:800px" | {| style="background:yellow; color:black; width:800px" | ||
| ''' pattern MultipleSupport $patternTag {''' | |||
|- | |- | ||
| '''groundMotion ...''' | | '''[[groundMotion Command | groundMotion]]...''' | ||
|- | |- | ||
| '''imposedMotion ...''' | | '''[[imposedMotion Command | imposedMotion]]...''' | ||
|- | |- | ||
| ''' ... ''' | | ''' ... ''' | ||
| Line 36: | Line 38: | ||
| style="width:150px" | '''$patternTag ''' || unique tag among load patterns | | style="width:150px" | '''$patternTag ''' || unique tag among load patterns | ||
|- | |- | ||
| '''groundMotion ...''' || command to generate a ground motion | | '''[[groundMotion Command| groundMotion]]...''' || command to generate a ground motion | ||
|- | |- | ||
| '''imposedMotion ...''' || command to generate an imposed motion | | '''[[imposedMotion Command| imposedMotion]] ...''' || command to generate an imposed motion | ||
|} | |} | ||
Latest revision as of 22:09, 2 February 2011
- Command_Manual
- Tcl Commands
- Modeling_Commands
- model
- uniaxialMaterial
- ndMaterial
- frictionModel
- section
- geometricTransf
- element
- node
- sp commands
- mp commands
- timeSeries
- pattern
- mass
- block commands
- region
- rayleigh
- Analysis Commands
- Output Commands
- Misc Commands
- DataBase Commands
The Multi-Support pattern allows similar or different prescribed ground motions to be input at various supports in the structure. In OpenSees, the prescribed motion is applied using single-point constraints, the single-point constraints taking their constraint value from user created ground motions.
<uml> abstract class TimeSeries LoadPattern <|-- MultipleSupportExcitation MultipleSupportExcitation o- GroundMotion MultipleSupportExcitation o- ImposedMotionSP ImposedMotionSP --- GroundMotion SP_Constraint <|-- ImposedMotionSP GroundMotion o- TimeSeries </uml>
The command to generate a multi-support excitation contains in { } the commands to generate all the ground motions and the single-point constraints in the pattern. The command is as follows:
| pattern MultipleSupport $patternTag { |
| groundMotion... |
| imposedMotion... |
| ... |
| } |
NOTES:
- The results for the responses at the nodes are the ABSOLUTE values, and not relative values as in the case of a UniformExciatation.
- The non-homogeneous single point constraints require an appropriate choice of constraint handler.
| $patternTag | unique tag among load patterns |
| groundMotion... | command to generate a ground motion |
| imposedMotion ... | command to generate an imposed motion |
Code Developed by: fmk