https://forums.autodesk.com/t5/structural-bridge-design-forum/iterations-have-failed-to-converge-at-result-point-of-interest-1/m-p/9810675#M1550 <P>Hi Liaqat,</P><P>&nbsp;</P><P>This error message indicates that the program cannot find a solution to the strain compatibility analysis.&nbsp; For post-tensioned design beams this can occur if there is not enough (or indeed any) reinforcement in the tension zones of the beam.&nbsp; I do not know what the details of your beam are, but if you have only specified post-tensioned tendons with no unstressed reinforcement than it is quite possible that in some areas and load cases&nbsp; the tendons are in the compression part of the beam.&nbsp; Try adding some nominal reinforcement in both top and bottom to see if this solves the problem.</P><P>&nbsp;</P><P>If this does solve your problem then please mark this reply as a solution so that others can benefit.&nbsp; If not, then please zip up your data file(s) and attach to a reply to this post so that I can investigate.&nbsp; Thanks</P><P>&nbsp;</P><P>Kind regards</P><P>&nbsp;</P><P>Dave Geeves</P> Mon, 19 Oct 2020 13:27:28 GMT dave_geeves 2020-10-19T13:27:28Z https://forums.autodesk.com/t5/structural-bridge-design-forum/iterations-have-failed-to-converge-at-result-point-of-interest-1/m-p/9810358#M1549 <P><FONT face="Calibri" color="#000000">Hi,</FONT></P><P><FONT face="Calibri" color="#000000">I am checking a post-tensioned concrete beam for different load cases. I am getting the following two errors one after the other when I analyse for Construction Sequence 1 and 2. I get these messages at every point of interest. Can you please help?</FONT></P><P><FONT face="Calibri" color="#000000">Regards,</FONT></P><P><FONT face="Calibri" color="#000000">Liaqat<span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture 1.PNG" style="width: 920px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/833043iA7FFAA4C8B4A787C/image-size/large?v=v2&amp;px=999" role="button" title="Capture 1.PNG" alt="Capture 1.PNG" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture 2.PNG" style="width: 923px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/833044iD3876A9042ACEDD4/image-size/large?v=v2&amp;px=999" role="button" title="Capture 2.PNG" alt="Capture 2.PNG" /></span></FONT></P> Mon, 19 Oct 2020 10:24:56 GMT https://forums.autodesk.com/t5/structural-bridge-design-forum/iterations-have-failed-to-converge-at-result-point-of-interest-1/m-p/9810358#M1549 Anonymous 2020-10-19T10:24:56Z https://forums.autodesk.com/t5/structural-bridge-design-forum/iterations-have-failed-to-converge-at-result-point-of-interest-1/m-p/9810675#M1550 <P>Hi Liaqat,</P><P>&nbsp;</P><P>This error message indicates that the program cannot find a solution to the strain compatibility analysis.&nbsp; For post-tensioned design beams this can occur if there is not enough (or indeed any) reinforcement in the tension zones of the beam.&nbsp; I do not know what the details of your beam are, but if you have only specified post-tensioned tendons with no unstressed reinforcement than it is quite possible that in some areas and load cases&nbsp; the tendons are in the compression part of the beam.&nbsp; Try adding some nominal reinforcement in both top and bottom to see if this solves the problem.</P><P>&nbsp;</P><P>If this does solve your problem then please mark this reply as a solution so that others can benefit.&nbsp; If not, then please zip up your data file(s) and attach to a reply to this post so that I can investigate.&nbsp; Thanks</P><P>&nbsp;</P><P>Kind regards</P><P>&nbsp;</P><P>Dave Geeves</P> Mon, 19 Oct 2020 13:27:28 GMT https://forums.autodesk.com/t5/structural-bridge-design-forum/iterations-have-failed-to-converge-at-result-point-of-interest-1/m-p/9810675#M1550 dave_geeves 2020-10-19T13:27:28Z