https://communities.bentley.com/communities/other_communities/chinafirst/f/sacs-moses-maxsurf/176760/member-unit-ratio-check-incorrectDear Sir, I used SACS to calculate the static strength of crane boom. however, I found some members unit ratio is exceed 1. I picked the one of these failure members, and found the ratio of the bending stress about y axial is not correct. And otheren-USTelligent Community 12https://communities.bentley.com/thread/511877?ContentTypeID=1Tue, 19 Mar 2019 00:16:13 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:05951db3-2dea-44ad-8364-36f21d34d9e3Qiang He<p>everything is fine here.</p> <p>according to API RP 2A 21st supplement 3 code(if you adopted this code), when the bending capacity needs to be checked, member slenderness needs to be accounted. taking member 0129-0110 for example, allowable bending stress is 258.75, allowable Euler stress is 110.05, actual applied axial stress is 87.52, and Cm is 0.85, all of the parameters make actual bending stress used for checking (1-87.52/110.05)*258.75/0.85=62.32, so bending UC for axis Y is 27.03/62.32=0.43</p> <p>in a word, there is no problem here.</p><div style="clear:both;"></div>https://communities.bentley.com/thread/511792?ContentTypeID=1Mon, 18 Mar 2019 14:38:00 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:d834f4b7-eb66-4dff-aef3-b9067d3a8cf2Qiang He<p>I will look into it and get back to you as soon as possible.</p><div style="clear:both;"></div>