RIGRESP

RIGRESP, Option, Method, Val1, Val2
Specifies the rigid response calculation.

SOLUTION: Spectrum Options

Option

Flag to activate or deactivate the rigid response calculation:

1 (ON or YES)	—	Activate.
2 (OFF or NO)	—	Deactivate. This value is the default.

Method

Method used to calculate the rigid response:

GUPTA	—	Gupta method.
LINDLEY	—	Lindley-Yow method.

Val1

If Method = GUPTA, Val1 represents the frequency F₁ in Hertz.

If Method = LINDLEY, Val1 is the Zero Period Acceleration (ZPA). If a scale factor is defined (FACT in the SVTYP command), it is used to scale this value

Val2

If Method = GUPTA, Val2 represents the frequency F₂ in Hertz.

Notes

This rigid response calculation is only valid for single-point response spectrum analysis (SPOPT, SPRS) and multiple-point response spectrum analysis (SPOPT, MPRS) with combination methods square root of sum of squares (SRSS), complete quadratic (CQC) or Rosenblueth (ROSE).

This command is also valid in PREP7.

Additional Information

Performing a Single-Point Response Spectrum (SPRS) Analysis in the Structural Analysis Guide

Performing a Multi-Point Response Spectrum (MPRS) Analysis in the Structural Analysis Guide

Rigid Responses in the Mechanical APDL Theory Reference

MMASS command

Example Usage

See this example problem Dynamic Simulation of a Nuclear Piping System Using RSA Methods in the Technology Showcase: Example Problems.

Menu Paths

This command cannot be accessed from a menu.