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Columns with irregular section get turned into beams
22.05.2014 19:30

Here's an interesting bug (bug?):

I haven't had the time to upgrade to T20.0 by the way, so, if this is fixed in version 20, excellent, I'll be happy in a few days.

I have a series of columns with a strange shapes. One side curved, a sharp 25 degree corner on one side, two rectangular sections sticking out of the sides, stuff like that. Not much of a problem to model, I simply create a custom section using a polygon and then apply the section to a column. Done.

But when I come back later, and check the properties on the column I get a "Concrete beam properties" window instead of concrete column. And sure enough, the properties I can change correspond to those of a concrete beam. This happens frequently when I'm doing irregular sections via polygons.

No real problem for volume calculations. But there is a problem for form and surface areas. The local axis system is different for beams and columns, so when you apply a formwork formula designed for a column to a beam, you get the wrong area.

Anyone found a way around this, or at least an explanation as to why Tekla changes the element types?

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Think I figured out why this
Re: Columns with irregular section get turned into beams 12.06.2014 00:33

Think I figured out why this happens. Seems that when you alter your column levels, if you happen to make the top level lower than the bottom level by accident (for example top level 0, bottom level 500), your column gets turned into a beam. Tekla will give you an error message, and at that point, your column has already become a beam. Even if you press cancel, your column will be a beam.

At that point the only way to remedy the situation, is to press undo, to revert the levels change and turn your element back into a column.

1 Upvote
It's all about the handles
Re: Think I figured out why this 03.07.2014 17:43

Mario,
Anytime your yellow handle (the start of the piece of steel) is directly below the magenta handle( indicating the end of the piece) Tekla will consider the piece a column. Conversly, if the magenta handle is below the yellow one, it will be considered a beam. I first noticed this when trying to model vertical chutework, and maintain all the properties of a beam, not a column. The solution I found was to model all vertical pieces from TOP to BOTTOM (yellow at the top/magenta on the bottom). This allows the piece to keep beam properties. *swap the handles (yellow on bottom/magenta on top) and all of the sudden it becomes a column TAAA DAAAA!

That being said, I believe we are trying to say the same thing, just in different applications and different desired results. Moral of the story, it's all about the handles.

1 Upvote