Plain GroundMotion: Difference between revisions
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| '''$tsTag''' || tag of TimeSeries object created using [[Time Series Command | timeSeries]] command. | | '''$tsTag''' || tag of TimeSeries object created using [[Time Series Command | timeSeries]] command. | ||
|- | |- | ||
| '''integratorType ...''' || | | '''integratorType ...''' || numerically integrate the TimeSeries with the Trapezoidal or Simpson method (optional, default=Trapezoidal). See NOTES below. | ||
|- | |- | ||
| '''$cFactor''' || constant factor (optional, default=1.0) | | '''$cFactor''' || constant factor (optional, default=1.0) | ||
Revision as of 23:22, 2 March 2016
This command is used to construct a plain GroundMotion object. Each GroundMotion object is associated with a number of TimeSeries objects, which define the acceleration, velocity and displacement records for that ground motion. The command is as follows:
| groundMotion $gmTag Plain <-accel $tsTag> <-vel $tsTag> <-disp $tsTag> <-int (IntegratorType intArgs)> <-fact $cFactor> |
where
| $gmTag | unique tag among ground motions in load pattern |
| $tsTag | tag of TimeSeries object created using timeSeries command. |
| integratorType ... | numerically integrate the TimeSeries with the Trapezoidal or Simpson method (optional, default=Trapezoidal). See NOTES below. |
| $cFactor | constant factor (optional, default=1.0) |
NOTES:
- The displacements are the ones used in the ImposedMotions to set nodal response.
- If only the acceleration TimeSeries is provided, numerical integration will be used to determine the velocities and displacements.
- For earthquake excitations it is important that the user provide the displacement time history, as the one generated using the trapezoidal method will not provide good results.
- Any combination of the acceleration, velocity and displacement time-series can be specified.
Code Developed by: fmk