Buckling analysis critical coefficient ALL negative

[c_rebeka2HDES]

Hi, I understand what it means when getting negative critical coefficient. (ref: Solved: Negative critical coefficients in buckling analysis - Autodesk Community - Robot Structural ...)

However, in my case, they are all negative and it does not make sense as my model only has downwards force.

Please kindly look into my case.

Thanks.

[okapawal · Accepted solution]

@c_rebeka2HDES 

I assume that you are running buckling analysis on combination cases.

You may set bigger number of modes and you will see positive coefficients down on the list.

Or just check "Determine positive critical coefficients only" and negative ones will be omitted.