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Can Angles be used as beams?
3

Can Angles be used as beams?

Can Angles be used as beams?

(OP)
I am not sure if Angles can take moment, and therefore
act as beams.

But I have seen angles used as a holder for windows or studs.

Can angles take uniform load (moment) then?

Thanks

RE: Can Angles be used as beams?

Yes, they can.

RE: Can Angles be used as beams?

(OP)
But how?  Mr=phi * S * Fy if it is class 1,2,3?

RE: Can Angles be used as beams?

What code are you using?

RE: Can Angles be used as beams?

(OP)
I mean can single angle take moment?

RE: Can Angles be used as beams?

(OP)
The Steel Handbook, S16

RE: Can Angles be used as beams?

As long as it can't buckle laterally (comp. flange is braced) then you can use Mr = phi*S*Fy, but if it can buckle then you need to consider the twisting caused by the load being applied off of the shear centre of the angle, and use the principal axes to check the point at which the stress reaches the yield stress, at one of the corners of the angle.

Using S16, must be a Canadian, eh?

RE: Can Angles be used as beams?

(OP)
Everything makes sense until, "Use the principal axes to check the point at which the stress reaches the yield stress."

How to use the axes of rotation to check the point of yielding stress.  Even if I have the point where it will yields, what purpose does it serve?  How am I getting a laterally unsupported moment?

RE: Can Angles be used as beams?

"How am I getting a laterally unsupported moment?"

By any chance, are you getting an error message in design software relating to an angle?  That's what that line sounds like.  If so, more detail on what is actually going on would be helpful.

RE: Can Angles be used as beams?

"How am I getting a laterally unsupported moment?"

You are not laterally supporting the moment, but the compression flange of the angle that is resisting the moment.  Angles are used to resist forces all the time. No worries.

Mike McCann
MMC Engineering

RE: Can Angles be used as beams?

To answer your question!

Angles can be used as beams.
Its a little bit more difficult to analyse them because of biaxial stresses because they are not symetrical.  Thats why theres Principle axis.  

It would be alot easier to look up safe load tables for your region particularly if they are only lightly loaded e.g. used as lintels over windows.

Cheers !

RE: Can Angles be used as beams?

that would be "Principal" ... geez

RE: Can Angles be used as beams?

If the angle is continuously laterally supported then you can get away with only analysing it under vertical bending.

RE: Can Angles be used as beams?

Theoretically, if the load goes thru the intersection of the principle axes, then there is no torsion, but show me where that is going to happen in the real world.  Those little load gremlins have a mind of their own.

Mike McCann
MMC Engineering

RE: Can Angles be used as beams?

There will be no torsion generated if the load passes through the shear centre (flexural center in Roark's).   For unsymmetric sections the shear centre is not in the same place as the centroid.

RE: Can Angles be used as beams?

Yes, you're right.  Sorry bout dat...

Guess I don't worry about angles in torsion too often... bigsmile

Mike McCann
MMC Engineering

RE: Can Angles be used as beams?

Neither me, I do not worry about torsion for short spans, windows, doors etc. Just a waste of brain. For more serious or critical loads, just go with wide flange beams and try not to create unsymmetrical loading. Make it easy to build, easy to analyse.

My two cents.

Regards,

Chicago Rarebug

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