Name

Type a unique name to identify the time history
load definition.

Save

Select this option to create an external file (input
file name with a .tmh extension ) containing the history of the displacements
of every node of the structure at every time step. 
Curve Type

Select the type of time history curve to
use:

Ground Motion (i.e., Acceleration)
indicates that the time varying load type is a ground motion.

Force indicates that it is a
forcing function.

Moment indicates that it is a
moment forcing function.

Data point source

Select the method of input for the time history values:
 Custom – specify explicit data pairs
for the selected Curve Type for specific times.
 External – specify explicit data pairs
for the selected Curve Type for specific times using an
external file.
 Polynomial  Uses a secondorder
polynomial (quadratic polynomial) to describe the time curve.
 Damped Harmonic – You will specify the factors in a generalized damped harmonic function.
 Harmonic – specify a harmonic function
parametrically
Tip: When entering
parameters for polynomial or damped harmonic functions, any of the coefficients
may be left as zero. However, time interval and finish time must be specified.
