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March 17, 2010

Do You Ever Get the “LOCKED” Message on a Simple Beam Model?

Do you get an instabilities warning when you’re trying to do a simple 2D model in RISA-3D?

Below is the easiest way to test and fix the instability:

  1. Open the Joint Reactions spreadsheet, and see which joint is unstable.
  2. In the Boundary Conditions spreadsheet, apply a Reaction to the joint in the degree of freedom that was LOCKED.
  3. Re-run the model and examine the Joint Reactions
    If the reaction that is restraining the instability is showing a ZERO force or moment, then the instability is inconsequential to the results.
    If the reaction that is restraining the instability is showing a non-zero force or moment, then you have a problem with the model that must be corrected for you to get valid results.


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This entry was posted by RISA News on Wednesday, March 17th, 2010 at 9:00 am and is filed under Technical Solutions. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

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