Modal Analysis - Releases creating large Errors within model

[Anonymous]

Hi All,

So basically I am running a basic steel frame. After setting up all material properties, section sizes and geometry, i ran the model to ensure everything is behaving as expected. At this point when looking at my results, i have 0-2mm deflection as expected from selfweight only.  My next step within modelling (before applying loads) is to release the members. When applying pinned releases to the members, the model goes crazy where after analyzing, where very large deflections are recorded on EVERY member (previously Zero for the same load case, without releases).  Anyone know how to get around the error? the members are to be released IRL.

Thank you,

Ian

[Muhammed.OPERA]

Hi @Anonymous

This post is about your same issue with solutions:

https://forums.autodesk.com/t5/robot-structural-analysis-forum/releases/td-p/5718552