Torsion on Structural Tee Shapes
Torsion on Structural Tee Shapes
(OP)
Has anyone ever performed a combined torsional and bending analysis on a Structural Tee shape? The only reference that I have been able to locate is the AISC design guide 9 which has all of one paragraph regarding Structural Tees?
Thanks.
Thanks.






RE: Torsion on Structural Tee Shapes
Probably going to have to break down an use an FEA program.
RE: Torsion on Structural Tee Shapes
RE: Torsion on Structural Tee Shapes
The difficult part is assessing lateral torsional buckling. If the flange is on top, it is good for positive moment regions and bad for negative moment regions because the web has virtually no resistance to lateral buckling.
Why use a T shape at all? Wouldn't a WF be more suitable?
BA
RE: Torsion on Structural Tee Shapes
Then, torsion effects are quite sensible to end constraints so I myself if looking at my references (most books on structural steel have sections on torsion, and also those dealing with reinforced concrete shearwall nucleus dealing with taking wind forces) would be quite atent to what I was doing to avoid errors in something one makes not everyday. Probably would check against FEM.
Doing the analysis by FEM as racookpe1978 recommends, say, by steel plate elements, will produce sure certainty in both the placement of the loads and the quality of the restraints, so I think if only for that should be preferred by anyone of us that normally does not make this kind of calculation.
RE: Torsion on Structural Tee Shapes
Further research has revealed that it is not a true Structural Tee but rather a proprietary product made by US Monorail (see attached).
RE: Torsion on Structural Tee Shapes
You can do even better with say Visual Nastran 4D, at least the extruded shapes could be made by sweep functions in autocad true to the rail; constraints not easy I assume to model yet some things can be made. And surely in Ansys and its likes you can get exact shape and constraints, only that there are lesser people proficient at these more complex programs.