Multi-Support Excitation Pattern: Difference between revisions

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Line 9: Line 9:
ImposedMotionSP --- GroundMotion
ImposedMotionSP --- GroundMotion
SP_Constraint <|-- ImposedMotionSP
SP_Constraint <|-- ImposedMotionSP
GroundMotion o- "one" TimeSeries
GroundMotion o- TimeSeries
</uml>
</uml>



Revision as of 23:04, 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- 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:

  1. The results for the responses at the nodes are the ABSOLUTE values, and not relative values as in the case of a UniformExciatation.
  2. 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