https://forums.autodesk.com/t5/robot-structural-analysis-forum/how-to-model-purlin/m-p/11733249#M7540 <P>Hello everyone,</P><P>&nbsp;</P><P>I would like to model a purling with a canteliver at one of its end. (see picture below). I have applied a gamma angle of 1,68° to the purling and an offset of 250 mm. The beam of which the purlin sits, has also an offset (if that is relevant in any way).</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="2023.02.06 - Question Autodesk panne.png" style="width: 600px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1172258i1D4F891EDBE145AD/image-size/medium?v=v2&amp;px=400" role="button" title="2023.02.06 - Question Autodesk panne.png" alt="2023.02.06 - Question Autodesk panne.png" /></span></P><P>What should the release between the purling and its support be?</P><P>&nbsp;</P><P>Moreover, I am gettin an instability type 3 at the end of one of the purlin (and if I delete the cantilever part, I get the same instability to the next purlin and so on)</P><P>&nbsp;</P><P>How to get rid of this instability?</P><P>Can't seem to be able to attach the model.</P><P>Thanks a lot in advance,</P><P>Jules</P><P>&nbsp;</P><P> </P> Mon, 06 Feb 2023 14:46:53 GMT j_garnierYCZEH 2023-02-06T14:46:53Z https://forums.autodesk.com/t5/robot-structural-analysis-forum/how-to-model-purlin/m-p/11733249#M7540 <P>Hello everyone,</P><P>&nbsp;</P><P>I would like to model a purling with a canteliver at one of its end. (see picture below). I have applied a gamma angle of 1,68° to the purling and an offset of 250 mm. The beam of which the purlin sits, has also an offset (if that is relevant in any way).</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="2023.02.06 - Question Autodesk panne.png" style="width: 600px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1172258i1D4F891EDBE145AD/image-size/medium?v=v2&amp;px=400" role="button" title="2023.02.06 - Question Autodesk panne.png" alt="2023.02.06 - Question Autodesk panne.png" /></span></P><P>What should the release between the purling and its support be?</P><P>&nbsp;</P><P>Moreover, I am gettin an instability type 3 at the end of one of the purlin (and if I delete the cantilever part, I get the same instability to the next purlin and so on)</P><P>&nbsp;</P><P>How to get rid of this instability?</P><P>Can't seem to be able to attach the model.</P><P>Thanks a lot in advance,</P><P>Jules</P><P>&nbsp;</P><P> </P> Mon, 06 Feb 2023 14:46:53 GMT https://forums.autodesk.com/t5/robot-structural-analysis-forum/how-to-model-purlin/m-p/11733249#M7540 j_garnierYCZEH 2023-02-06T14:46:53Z https://forums.autodesk.com/t5/robot-structural-analysis-forum/how-to-model-purlin/m-p/11733970#M7541 <P>HI&nbsp;<a href="https://forums.autodesk.com/t5/user/viewprofilepage/user-id/13468049">@j_garnierYCZEH</a>&nbsp;</P><P>You can use compatible nodes</P><P><A href="https://help.autodesk.com/view/RSAPRO/2023/ENU/?guid=GUID-827814C0-A254-4361-B199-DCC6D996817B" target="_blank">https://help.autodesk.com/view/RSAPRO/2023/ENU/?guid=GUID-827814C0-A254-4361-B199-DCC6D996817B</A></P><P>Best Regards</P> Mon, 06 Feb 2023 18:59:52 GMT https://forums.autodesk.com/t5/robot-structural-analysis-forum/how-to-model-purlin/m-p/11733970#M7541 Stephane.kapetanovic 2023-02-06T18:59:52Z