Turning Vane Modeling in Staad 2

[elinwood]

I'm trying to model a turning vane in Staad to investigate the effects of loads on the turning vane.

I was wondering if you guys have an idea on how to model the "curved plate" of the turning vane? I've been looking at this issue for a couple of weeks now and I can't seem to find anything. I'm trying to apply "wind" loads on a projection of the turning vane as well. Is there a way for Staad to put loads on the projection instead of the actual geometry?

I ended up splitting the plates into a few sections, but now the plate cannot be analyzed because the ratio is too small. Anyone care to help me with a solution? I attached my model in this post.

 

[JoshPlumSE]

First off, your plates are not very well meshed. Currently they are about 23ft tall by 0.3 ft wide x 0.135" thick.

Try sub-meshing in the vertical direction so that you have connectivity to all joints that occur along the length of the plates. Attached is a screenshot of your model (imported into RISA) where I have done this. In fact, I show two separate meshes. The finer mesh is better because it is capable of capturing the plate deflection and bending which will occur between the supporting beams or stiffeners.

That's more important than the loading. I don't actually know how to do a "projected" load in STAAD, but it is easy to do in RISA, you just specify PX rather than X as the direction of the loading.

 

[elinwood]

Hey Josh, Thanks for replying!

I finally got done changing the mesh to a finer mesh and assigned the correct properties on the model. I did two models with increasing refinement on the mesh size. For some reason, the beam stress increased significantly on the finer mesh.

The newer files are attached. I was wondering what kind of connections between the plate and the beams are default on staad? The stresses on the plates are very small, but the stresses on the stiffeners/beams are very big, bigger than I expected (40 ksi Combined Stress, but only 30 ksi on the larger mesh size - Refining the mesh results in a higher stress)

 

[TLHS]

I haven't looked at your files, but as far as connectivity goes, STAAD always assumes that nodes are fully fixed to all elements unless some modifier is applied.

 

[ToadJones]

Josh-
You can import STAAD models into RISA and vice versa?

 

[JoshPlumSE]

ElinWood -

That model looks much better now. And, the reason why you're getting higher stresses in the beams now is because they were not properly connected to your plates before. Now, it look like they connect nicely.

Now, you can start worrying about your projected loads. Like I said before, I don't know how to do this in STAAD.... I'm mostly a RISA guy and it's been years since I used STAAD. There is a "Bentley: STAAD products" forum where you may be able to get that portion of your question answered... if you can't get a response on this forum, that is.


Toad -

RISA's had a STAAD import utilty since the 1990's! It's helped a lot of people make the transition from STAAD to RISA over the years.

However, RISA does not export into STAAD. Nor do we have any current plans to do so. Maybe someday, but not right now.

 

[dhengr]

There ain’t no room for vain models on this here forum. This here forum is for important things n stuffs. Please move your post to the Victoria’s Secret web site, if you’re going to keep this up. And, then the idea that you can import models and their vice versas is really revoltin.

 

[ToadJones]

Vein - a : a narrow water channel in rock or earth or in ice b (1) : lode 2 (2) : a bed of useful mineral matter c : lode 3
2
: blood vessel; especially : any of the tubular branching vessels that carry blood from the capillaries toward the heart
3
a : any of the vascular bundles forming the framework of a leaf b : any of the thickened cuticular ribs that serve to stiffen the wings of an insect
4
: something suggesting veins (as in reticulation); specifically : a wavy variegation (as in marble)
5
a : a distinctive mode of expression : style <stories in a romantic vein> b : a distinctive element or quality : strain <introduced a welcome vein of humor> c : a line of thought or action
6
a : a special aptitude <inherited an artistic vein> b : a usually transitory and casually attained mood c : top form <thou troublest me; I am not in the vein — Shakespeare>


Vain-
: having no real value : idle, worthless <vain pretensions>
2
: marked by futility or ineffectualness : unsuccessful, useless <vain efforts to escape>
3
archaic : foolish, silly
4
: having or showing undue or excessive pride in one's appearance or achievements : conceited
— vain·ly adverb
— vain·ness \ˈvān-nəs\ noun
— in vain
1
: to no end : without success or result <her efforts were in vain>
2
: in an irreverent or blasphemous manner <you shall not take the name of the Lord your God in vain — Deuteronomy 5:11 (Revised Standard Version)>

Vane-
a : a movable device attached to an elevated object (as a spire) for showing the direction of the wind b : one that is changeable or inconstant
2
: a thin flat or curved object that is rotated about an axis by a flow of fluid or that rotates to cause a fluid to flow or that redirects a flow of fluid <the vanes of a windmill>
3
: the web or flat expanded part of a feather

 

[ToadJones]

Josh-
Does RISA just import the geometry or the entire model?

 

[JoshPlumSE]

Toad -

The STAAD import is just about everything. Loads, member sizes, orientation, et cetera. It was originally written a number of years ago, so some newer features may not import. But, all the basics should come in without a problem. If anything does not get imported you will get a line by line *.log file that tells you exactly which lines were not imported.

 

[ToadJones]

I was not aware.
Thank you Josh.

 

[elinwood]

Josh-

Thanks for your replies!