**SRSS****SRSS**, `SIGNIF`

, `Label`

, `AbsSumKey`

, `ForceType`

**Specifies the square root of sum of squares mode combination
method.**

`SIGNIF`

Combine 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.)

`Label`

Label 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. |

`AbsSumKey`

Absolute Sum combination key (for **SPOPT**,MPRS only):

**NO**
| — | Do not use the Absolute Sum method
(default). |

**YES**
| — | Combine the modes per excitation direction
using the Absolute Sum method, then combine the resulting quantities
using the square root of sum of squares method. When using
Absolute Sum combination, the excitation direction must be specified
using the **SED** command. |

**ForceType**Label identifying the forces to be combined:

**STATIC**
| — | Combine the modal static forces
(default). |

**TOTAL**
| — | Combine the modal static plus inertial
forces. |

## Notes

This command is also valid for PREP7.