Hello, I have performed simple linear buckling analysis of square hollow section made of steel using ABAQUS/CAE. The length of the column is 1.8 meters with fixed end boundary conditions. I have used both MPC rigid beam and structural coupling connection methods at both ends of the specimen and applied the fixed boundary conditions. The theoretical buckling load is 580 kN. However, ABAQUS/CAE gave 1160 and 1200 kN. Can anyone give the reason and what could be wrong?
your mode shape looks ok for fixed fixed condition....as it is a simple analysis, I assume you are getting correct buckling load from FEA...It seems to me you are not taking correct length for your calculation as there is a factor of 2 between calculation and FE.... please recheck your all the calculation and FE inputs thoroughly...
I zoomed into your image on the down-left corner and noticed that you forgot to prevent rotation of the shell about the cross-section edges at the end. You need to set that to zero. Is the mesh at the center of the shell thickness? In that case the offset is zero; but if the mesh is on the outer surface if the mesh (and the normal points out, the offset is +0.5. Did you enter the correct thickness and properties? There are several sources of error as you see. The factor of 2 looks suspicious, as showing a property mistake.
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