https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/101890/staad-v8i-series-4-20-07-09-31-slenderness-checkHi, Currently I am using AISC 360-10, I assigned slenderness value 200 ( main 200) to members. some of the members are fail in slenderness but STAAD result shows &quot;pass&quot; could you please tell me why it happens ? please see attached snap below. en-USTelligent Community 12https://communities.bentley.com/thread/303105?ContentTypeID=1Fri, 17 Oct 2014 05:17:20 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:cf82916e-b08b-4472-b817-fae20d4ff586ModestasI ran your model in version 20.07.10.64 and members 1308 and 1310 are failing in slenderness with utilization ratio 1.1335. So it seems that this issue is fixed in the current STAAD.Pro version as I noted previously.<div style="clear:both;"></div>https://communities.bentley.com/thread/303103?ContentTypeID=1Fri, 17 Oct 2014 03:58:50 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:a00bf3b2-8d85-4da2-9c52-3f32355c2a64Vdave<p>Hi, Thanks for reply,</p> <p>See attached file below ,</p> <p><a href="https://communities.bentley.com/cfs-file/__key/communityserver-discussions-components-files/5932/Fin_2D00_Fan-StructurE_2800_30_2D00_SEP_2D00_2014_29002D00_.std">communities.bentley.com/.../Fin_2D00_Fan-StructurE_2800_30_2D00_SEP_2D00_2014_29002D00_.std</a></p><div style="clear:both;"></div>https://communities.bentley.com/thread/302949?ContentTypeID=1Thu, 16 Oct 2014 12:30:39 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:de22815a-ffb1-431d-b16c-bc0f24c9282dModestasThis might be due to an issue in STAAD.Pro build 20.07.09.31. If you wish, attach your model and I could check if this issue is fixed in the current version (build 20.07.10.64). I believe that it should be fixed in the latest version so you may want to upgrade to it.<div style="clear:both;"></div>