Force Distribution 1

[Sheila Rose]

Hi Guys,

Can you please help me in figuring out the possible force distribution of the below sketch. Horizontal Brace Connection.

 

[KootK]

My first question would be what is the intended destination for the vertical component of the brace force? Strong axis flexure in the W12X79? Or is there another framing member in the plane of the brace that is missing from the sketch?

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[rb1957]

the vertical component in the brace looks to put bending in the W14x90 and the W12x79.

as KootK says where does this load go to ground ? is there a more natural loadpath, ie not shown ?


another day in paradise, or is paradise one day closer ?

 

[jayrod12]

Add me to the, "This is a confusing sketch without more information" group. Which member is a beam, a girt, a column. Is the brace a vertical brace or a horizontal. What drives the geometry?

 

[3DDave]

Looks like someone napped in free-body diagram class.

 

[BAretired]

The compressive force shown by an arrow on the diagonal brace will be resolved into a vertical force taken by the W12x79 in bending and a horizontal force taken by the W14x90 in tension.

BA

 

[TehMightyEngineer]

All I can say is that whatever you're trying to do here; there's got to be a better way.

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries

http://www.americanconcrete.com

 

[KootK]

As it stands, you've basically got a donut lookin' gusset plate thingy that needs designing. Horizontal bracing is usually pretty lightly loaded and your single angle, two bolt connection would support that. So it may well be doable.

Here's an article to get you headed in the right direction, at least as far as this configuration goes.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[KootK]

Assuming that I underand the situation correctly, my recommendation is shown below. I think that is has advantages in terms of mechanics, fabrication, and erection.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[BAretired]

KootK,

Do you feel that enough is known about the application to make recommendations?

BA

 

[KootK]

I do indeed. It kinda gelled for me over the weekend. I didn't fully appreciate the "horizontal bracing" bit on the first pass. Besides, it's the internet. It's Sheila's job to pass judgement on the applicability of my recommendations. I'm just a humble perveyor of slick details, not a substitute for engineering judgement or a real mentor.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[TehMightyEngineer]

Besides, it's the internet. It's Sheila's job to pass judgement on the applicability of my recommendations. I'm just a humble perveyor of slick details, not a substitute for engineering judgement or a real mentor.

Hear, hear!

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries

http://www.americanconcrete.com

 

[Sheila Rose]

W12X79 Column
W14X90 Beam Connecting to a Built-Up I-Shape due to stub requirements.

 

[rb1957]

so the vertical component of the brace is causing bending in the W14 and the W12 beams.
and the horizontal component is axial load on the W14 and lateral bending on the W12.

now you could say that the little brackets would distribute the vertical load into the W12 and the horizontal load into W14 (tension).

another day in paradise, or is paradise one day closer ?