Slenderness Ratio

Good day. 

I am having some trouble with my design of an office/warehouse. The model may have more issues than I'm aware of but for now my concern is with the designed sections. The steel sections that STAAD recommends are too large and are similar for other members that should be smaller. Hope you find the time to help with this. Thank you all and best regards.Office Warehouse Analysis.std

Parents
  • The high ratio in few of the members like member 1337 are mostly due to the fact that I shaped members have been axially rotated by BETA 90 making the gravity load to bend these member about the minor axis (weak axis), ultimately lowering the bending capacity which contributes to the increase in overall interaction ratio.



  • Thank you for your reply. After reviewing my file I found that the only members I have rotated are C sections. I verified this by highlighting the members in the beta angle tab in properties with beta 90 and 3D rendering afterwards. I also found that after analyzing the structure a second time the number of warnings increased and mentions that the members fail in slenderness again even after Ly, Lz, UNB, UNT parameters were assigned and I essentially made no changes before running the analysis again. Thank you again for any advice you may provide.
Reply
  • Thank you for your reply. After reviewing my file I found that the only members I have rotated are C sections. I verified this by highlighting the members in the beta angle tab in properties with beta 90 and 3D rendering afterwards. I also found that after analyzing the structure a second time the number of warnings increased and mentions that the members fail in slenderness again even after Ly, Lz, UNB, UNT parameters were assigned and I essentially made no changes before running the analysis again. Thank you again for any advice you may provide.
Children
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