Uniform Excitation Pattern

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The UniformExcitation pattern allows the user to apply a uniform excitation to a model acting in a certain direction. The command is as follows:

pattern UniformExcitation $patternTag $dir -accel $tsTag <-vel0 $vel0> <-fact $cFactor>

$patternTag unique tag among load patterns
$dir direction in which ground motion acts
1 - corresponds to translation along the global X axis
2 - corresponds to translation along the global Y axis
3 - corresponds to translation along the global Z axis
4 - corresponds to rotation about the global X axis
5 - corresponds to rotation about the global Y axis
6 - corresponds to rotation about the global Z axis
$tsTag tag of the TimeSeries series defining the acceleration history.
$vel0 the initial velocity (optional, default=0.0)
$cFactor constant factor (optional, default=1.0)

NOTES:

  1. The responses obtained from the nodes for this type of excitation are RELATIVE values, and not the absolute values obtained from a multi-support case.


Code Developed by: fmk