Steel beam-column connection torsion
Steel beam-column connection torsion
(OP)
Hi I'm currently modelling a steel beam under torsion that is welded to a column. I am currently having problems modelling the contact surface as it says that in the Warnings page:
(576 elements are distorted. Either the isoparametric angles are out of the suggested limits or the triangular or tetrahedral quality measure is bad. The elements have been identified in element set WarnElemDistorted.)
(576 elements are distorted. Either the isoparametric angles are out of the suggested limits or the triangular or tetrahedral quality measure is bad. The elements have been identified in element set WarnElemDistorted.)





RE: Steel beam-column connection torsion
RE: Steel beam-column connection torsion
You have poorly shaped elements "distorted". Therefore, the results cannot be trusted. ABAQUS created a set for you to observe the specific elements it is referring to.
You will have to improve the quality of the mesh. Of course, then there is a question of why you are using contact in the first place, but that is another story.
Brian
www.espcomposites.com
RE: Steel beam-column connection torsion
RE: Steel beam-column connection torsion
Brian
www.espcomposites.com
RE: Steel beam-column connection torsion
RE: Steel beam-column connection torsion
RE: Steel beam-column connection torsion
RE: Steel beam-column connection torsion
Do you simply want to connect the parts (tie them together)? That can be done many ways. It seems you may be "shooting darts" if the previous results and warnings are stumping you.
You may want to start by asking questions on how to approach problems, rather than creating a potentially awkward model/scenario and trying to "debug" the issues. Being a novice user, you may have several issues that should be addressed.
Brian
www.espcomposites.com
RE: Steel beam-column connection torsion
Thanks
RE: Steel beam-column connection torsion
- Try the contact solution again, but improve the mesh such that you don't get warnings. I am guessing it is due to the thin endplate trying to be meshed with solids. You probably need more elements.
- If you can visualize where the contact will occur, just ground the appropriate surfaces/nodes and don't apply boundary conditions to the areas will separate.
General:
- You should consider plate/shell elements rather than solids. You will a lot of solid elements (and a few through the endplate thickness) to capture the bending in it.
- As a beginner, forget about the contact. You have bigger fish to fry, like understanding how to use the proper element, mesh density, etc. You may be eager to jump into difficult problems, but it will be counter productive in the long run. Break out your FEM book as well and start getting familiar with the behavior of elements.
Brian
www.espcomposites.com