Timber design . Member definition, lateral buckling

[Hallvard]

Hi 🙂

When defining timber members I need to define lateral bucling parameters. Lateral buckling length coeff and load level seems ok to me.

The "lateral buckling type" makes me wonder.... I can choose between "Beam with pinned supports" / "Beam with fixed supports" / "Cantilever" / "Without lateral bucling".

- A beam can be simply supported, but torsionally restrained at the supports. (If you use a u-bracket or a similar detail.) This beam will not be have pinned supports and not have fixed supports.

So my question: Does "Beam with fixed supports" in lateral bucklibng type definition apply to the beam I described?

( Even though it might be more precise to call it "Beam with torsionally restrained supports")

- Hallvard

[Artur.Kosakowski]

I will leave the decision which value of the lateral buckling coefficient (the unrestrained lateral buckling length) to use in your hands but I will try to explain how this value is calculated for different parameters defined within a member definition type.  This I hope will answer the 'Does "Beam with fixed supports" in lateral buckling type definition apply to the beam I described?' question

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[Hallvard · Accepted solution]

Perfect!

Maybe not what I asked for, but just what I needed

If there is a training manual for RSA 2012 that provides that kind of information for all kinds of timber-elements I would really like a copy. As far as I know the training manual available is for RSA 2010, and does not contain info about timber.

Thanks

- Hallvard

[dyogoandre]

Hi,

I have some doubts about this subject. I can't understand what the equations that robot uses in the "effective length" calculation. I saw the image that you post in attachments but, in my situation, i have a simply supported beam with a uniform load applied above the neutral axis, and the "l,eff" is greater then L, and i think it isn't possible.

Anyone can help me?

[Artur.Kosakowski]

Could you attach the file with this beam please?

[dyogoandre]

Hi Artur,

I already solved the design of timber members. However, I want to understand how robot calculates the leff in the project in attachments.