uniformExcitation.rst

UniformExcitation Pattern

pattern('UniformExcitation',patternTag,dir,'-disp',dispSeriesTag,'-vel',velSeriesTag,'-accel',accelSeriesTag,'-vel0',vel0,'-fact',fact)

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

patternTag	unique tag among load patterns
dir	direction in which ground motion acts corresponds to translation along the global X axis
correspon	ds to translation along the global Y axis
correspon	ds to translation along the global Z axis
correspon	ds to rotation about the global X axis
correspon	ds to rotation about the global Y axis
correspon	ds to rotation about the global Z axis
dispSeriesTag	tag of the TimeSeries series defining the displacement history. (optional)
velSeriesTag	tag of the TimeSeries series defining the velocity history. (optional)
accelSeriesTag	tag of the TimeSeries series defining the acceleration history. (optional)
vel0	the initial velocity (optional, default=0.0)
fact	constant factor (optional, default=1.0)

Note

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.
2. must set one of the disp, vel or accel time series