Intercepting vertical bracing with beam?
Intercepting vertical bracing with beam?
(OP)
On a project we need to extend a floor to the end of a bay. At the end of the bay are two W14 vertical bracing members (see attachment). This vertical bracing is mirrored at levels above and below forming Xs as you move up and down the large structure. I’d like to directly connect to the W14 braces with the proposed W18 but do not want to create an overly stiff “story”. (Maybe a stiff story is created already because the W14s are braced by the W27x94?) Is there any published guidance on whether this is acceptable or rules of thumb on relative stiffness? I looked in AISC 327 and 325 and didn’t find anything.






RE: Intercepting vertical bracing with beam?
RE: Intercepting vertical bracing with beam?
Diagrid buildings do this kind of thing in spades. Check out the John Hancock building.
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.
RE: Intercepting vertical bracing with beam?
KootK: Thank you for your feedback, the Hancock is near me and I always wondered if and to what extent the floors provide bracing for the large vertical X braces.
RE: Intercepting vertical bracing with beam?
RE: Intercepting vertical bracing with beam?
If I remember correctly you can't have punctuation in the file name.
RE: Intercepting vertical bracing with beam?
I would have just used simple shear/axial framing connections rather that all of the welding.
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.
RE: Intercepting vertical bracing with beam?
Mike McCann, PE, SE (WA)
RE: Intercepting vertical bracing with beam?
KootK: This is an ordinary concentrically braced frame. I would attach the proposed W14x68 to the vertical bracing W14s with bolted angles on both sides of the web. The angles would have to be cut at a skew on the leg attaching to the W14x68 web.
RE: Intercepting vertical bracing with beam?
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.
RE: Intercepting vertical bracing with beam?
RE: Intercepting vertical bracing with beam?
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.
RE: Intercepting vertical bracing with beam?
RE: Intercepting vertical bracing with beam?
jike: If I understand your suggestion, the columns and the braces are in the same vertical plane.