Multi-Support Excitation Pattern: Difference between revisions
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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> | <uml> | ||
abstract class TimeSeries | abstract class TimeSeries | ||
LoadPattern <|-- MultipleSupportExcitation | LoadPattern <|-- MultipleSupportExcitation | ||
MultipleSupportExcitation o- GroundMotion | MultipleSupportExcitation o- GroundMotion | ||
MultipleSupportExcitation o- ImposedMotionSP | MultipleSupportExcitation o- ImposedMotionSP | ||
ImposedMotionSP --- GroundMotion | |||
SP_Constraint <|-- ImposedMotionSP | SP_Constraint <|-- ImposedMotionSP | ||
GroundMotion o- "one" TimeSeries | |||
</uml> | </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: | |||
{| style="background:yellow; color:black; width:800px" | |||
''' pattern MultipleSupport $patternTag {'''' | |||
|- | |||
| '''groundMotion ...''' | |||
|- | |||
| '''imposedMotion ...''' | |||
|- | |||
| ''' ... ''' | |||
|- | |||
| '''}''' | |||
|} | |||
NOTES: | |||
#The results for the responses at the nodes are the ABSOLUTE values, and not relative values as in the case of a UniformExciatation. | |||
#The non-homogeneous single point constraints require an appropriate choice of constraint handler. | |||
---- | |||
{| | |||
| style="width:150px" | '''$patternTag ''' || unique tag among load patterns | |||
|- | |||
| '''groundMotion ...''' || command to generate a ground motion | |||
|- | |||
| '''imposedMotion ...''' || command to generate an imposed motion | |||
|} | |||
---- | |||
Code Developed by: <span style="color:blue"> fmk </span> | |||
Revision as of 22:29, 24 February 2010
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- "one" 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:
| 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