DSUM, SIGNIF, Label, TD, ForceType
Specifies the double sum mode combination method.
SIGNIFCombine only those modes whose significance level
exceeds the SIGNIF threshold. For single
point, multipoint, or DDAM response (SPOPT, SPRS,
MPRS, or DDAM), the significance level of a mode is defined as the
mode coefficient of the mode, divided by the maximum mode coefficient
of all modes. Any mode whose significance level is less than SIGNIF is considered insignificant and is not contributed
to the mode combinations. The higher the SIGNIF threshold, the fewer the number of modes combined. SIGNIF defaults to 0.001. If SIGNIF is specified as 0.0, it is taken as 0.0. (This mode combination
method is not valid for SPOPT, PSD.)
LabelLabel identifying the combined mode solution output.
DISP | — | Displacement solution (default). Displacements, stresses, forces, etc., are available. |
VELO | — | Velocity solution. Velocities, "stress velocities," "force velocities," etc., are available. |
ACEL | — | Acceleration solution. Accelerations, "stress accelerations," "force accelerations," etc., are available. |
TDTime duration for earthquake or shock spectrum. TD defaults to 10.
Label identifying the forces to be combined:
STATIC | — | Combine the modal static forces (default). |
TOTAL | — | Combine the modal static plus inertial forces. |