EngrRC
Structural
- Dec 19, 2018
- 45
I am doing global buckling analysis of a truss. What is the recommended buckling load factor (ratio of buckling load to applied load) that you use in your design office?
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Agent666 said:Check this post and the next in the series for general information on performing an axial buckling analysis
TheRick109 said:EngrRC - for bridges, which is my main area of practice, I’ve never had to consider secondary effects. If you follow AASHTO there are slenderness requirements that AISC doesn’t have. Kl/r is 120 maximum for primary members and 140 for secondary members in compression. Let me do some digging as I think there is commentary on these limits. If you do encounter the need to consider secondary effects I’d suggest using moment magnification instead of p-delta. Moment magnification is easier and a little more conservative than p-delta analysis. AASHTO and AISC have provisions for this method.
Again, let me do some searching in the codes and I’ll post anything helpful.