https://forums.autodesk.com/t5/robot-structural-analysis-forum/columns-move-out-of-position-once-a-rigid-link-is-placed-to/m-p/12090704#M7181 Thank you, that solved the problem for me. Mon, 10 Jul 2023 09:51:33 GMT nkosana.ndlovu 2023-07-10T09:51:33Z https://forums.autodesk.com/t5/robot-structural-analysis-forum/columns-move-out-of-position-once-a-rigid-link-is-placed-to/m-p/11817178#M7177 <P>Greetings,</P><P>&nbsp;</P><P>I am working on a building design and I have used rigid links to model a situation whereby&nbsp; 4 columns or two columns share a common base. The trouble I am having is that, when I run analysis, columns get distorted. The bottom nodes move 10mm out of position, and in some cases, the bottom nodes are abandoned for the nodes to share the common support node (which is also the rigid link master node).&nbsp;</P><P>&nbsp;</P><P>I also get the error of members being "member length zero," and "overlapping members, beams or columns not allowed in a calculation model."</P><P>&nbsp;</P><P>How can I model this correctly? Is there a problem with how i specified the rigid links? Find attached pictures of the model, as well as the definition of the rigid links used.<span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="clearer picture.JPG" style="width: 421px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1187896i95A6A089E1735795/image-size/large?v=v2&amp;px=999" role="button" title="clearer picture.JPG" alt="clearer picture.JPG" /></span></P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="columns askew.JPG" style="width: 574px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1187895i5BB40BBEFEC10DCF/image-size/large?v=v2&amp;px=999" role="button" title="columns askew.JPG" alt="columns askew.JPG" /></span><span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="columns in revit.JPG" style="width: 851px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1187901i737BFD94C3039CF3/image-size/large?v=v2&amp;px=999" role="button" title="columns in revit.JPG" alt="columns in revit.JPG" /></span></P><P>&nbsp;</P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="columns side by side.PNG" style="width: 254px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1187897iA58E2BAF9FB428F7/image-size/large?v=v2&amp;px=999" role="button" title="columns side by side.PNG" alt="columns side by side.PNG" /></span></P><P>&nbsp;<span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="rigid link definition.JPG" style="width: 313px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1187903i63636CA250959086/image-size/large?v=v2&amp;px=999" role="button" title="rigid link definition.JPG" alt="rigid link definition.JPG" /></span></P><P>&nbsp;</P> Mon, 13 Mar 2023 09:26:27 GMT https://forums.autodesk.com/t5/robot-structural-analysis-forum/columns-move-out-of-position-once-a-rigid-link-is-placed-to/m-p/11817178#M7177 nkosana.ndlovu 2023-03-13T09:26:27Z https://forums.autodesk.com/t5/robot-structural-analysis-forum/columns-move-out-of-position-once-a-rigid-link-is-placed-to/m-p/11821298#M7178 <P>Hi&nbsp;<a href="https://forums.autodesk.com/t5/user/viewprofilepage/user-id/6060276">@nkosana.ndlovu</a>&nbsp;</P> <P>Share zipped Robot model for verification. Share model version saved before calculation (nodes merging)</P> Tue, 14 Mar 2023 19:12:38 GMT https://forums.autodesk.com/t5/robot-structural-analysis-forum/columns-move-out-of-position-once-a-rigid-link-is-placed-to/m-p/11821298#M7178 Krzysztof_Wasik 2023-03-14T19:12:38Z https://forums.autodesk.com/t5/robot-structural-analysis-forum/columns-move-out-of-position-once-a-rigid-link-is-placed-to/m-p/11822205#M7179 <P>This was modelled in Robot Structural analysis 2023. Please help clarify. Is the problem due to importing the model from Revit (also 2023), or is it due to the set-up of the rigid links? What is the best approach</P> Wed, 15 Mar 2023 06:29:18 GMT https://forums.autodesk.com/t5/robot-structural-analysis-forum/columns-move-out-of-position-once-a-rigid-link-is-placed-to/m-p/11822205#M7179 nkosana.ndlovu 2023-03-15T06:29:18Z https://forums.autodesk.com/t5/robot-structural-analysis-forum/columns-move-out-of-position-once-a-rigid-link-is-placed-to/m-p/11822406#M7180 <P>Hi&nbsp;<a href="https://forums.autodesk.com/t5/user/viewprofilepage/user-id/6060276">@nkosana.ndlovu</a>&nbsp;</P> <P>&nbsp;</P> <P>In my opinion problem might be caused by too big tolerance (node merging region diameter) defined in Analysis&gt;Analysis types&gt;Structure model. I would recommend decreasing&nbsp; tolerance value. Tolerance = 250 mm is too big for me.</P> <P>&nbsp;</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Krzysztof_Wasik_0-1678870619897.png" style="width: 600px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1188870i2D877F65FDEF69B3/image-size/medium?v=v2&amp;px=400" role="button" title="Krzysztof_Wasik_0-1678870619897.png" alt="Krzysztof_Wasik_0-1678870619897.png" /></span></P> <P>&nbsp;</P> <P>&nbsp;</P> Wed, 15 Mar 2023 08:58:09 GMT https://forums.autodesk.com/t5/robot-structural-analysis-forum/columns-move-out-of-position-once-a-rigid-link-is-placed-to/m-p/11822406#M7180 Krzysztof_Wasik 2023-03-15T08:58:09Z https://forums.autodesk.com/t5/robot-structural-analysis-forum/columns-move-out-of-position-once-a-rigid-link-is-placed-to/m-p/12090704#M7181 Thank you, that solved the problem for me. Mon, 10 Jul 2023 09:51:33 GMT https://forums.autodesk.com/t5/robot-structural-analysis-forum/columns-move-out-of-position-once-a-rigid-link-is-placed-to/m-p/12090704#M7181 nkosana.ndlovu 2023-07-10T09:51:33Z