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Buckling of I section with intermediate restraint in 3D ABAQUS

Buckling of I section with intermediate restraint in 3D ABAQUS

Buckling of I section with intermediate restraint in 3D ABAQUS

(OP)
I need to make a model where a strut will buckle due to an axial load, I've tried to make it in 2D with a wire, however it buckles in the wrong axis. I'm using springs as the intermediate restraints as I need to vary the stiffness. I've tried numerous times, in 3D I need more nodes than allowed in the student version (250K), I needed so many because it wouldn't mesh properly. I need to look at the relationship between the axial load on the strut and the restraint force in the strut. I feel like it needs to be in 3D, as later I will need to change the eccentricity of the load and where in the section the intermediate springs are. Any help in getting this model to work would be greatly appreciated.

RE: Buckling of I section with intermediate restraint in 3D ABAQUS

A wire? I don't know what software you're using, but that sounds as though it might be a tension-only element, so useless for buckling studies.

A 2D model that's implemented correctly will be constrained to a single plane so wouldn't be able to buckle about the wrong axis. (unless you mean it's buckling in plane, but you have input the section rotated 90 degrees from what you intended?)

If you're using line elements like sketched on your attachment, you won't need anything like 250,000 nodes. You'd need fewer than 20. Overcomplication of FEM models is something to avoid like the plague.

RE: Buckling of I section with intermediate restraint in 3D ABAQUS

Whoops. Just read the thread title. Abaqus. Is there a reason you need 3D for this? Is it required by the lecturer? Looking at your sketches, line elements in 2D look best for what you're investigating.

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