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Knee Braces and AISC 341-05

Knee Braces and AISC 341-05

Knee Braces and AISC 341-05

(OP)
I am trying to figure out if knee braces are allowed in accordance with AISC 341-05. Now, I know if I select an R=3 system, I can basically use any system for bracing the structure I would like. However, I seem to remember reading somewhere that knee braces were allowed to be used under the criteria of an OMF. Does anyone know where in AISC 341-05 this is allowed?

RE: Knee Braces and AISC 341-05

(OP)
Never fails....... I found it under the commentary for ordinary moment frames section C11.1 on page 6.1-170.

RE: Knee Braces and AISC 341-05

Yes, knee braces are allowed under an OMF system. The only mention I am aware of is in the commentary of ASCE 341. See C11.1.

Depending on your SDC, I don't agree with your statement of being able to use any system for an R = 3.

RE: Knee Braces and AISC 341-05

(OP)
Well, if you are SDC D E or F you are not allowed to use R=3.... and if you are over the height requirements for SDC A and B you are not allowed to use R=3 either.

RE: Knee Braces and AISC 341-05

(OP)
That should read: If you are over the height requirements for SDC B and C your are not allowed to use R=3.

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