ASCE/SEI 7-10 Table 12.2.1
ASCE/SEI 7-10 Table 12.2.1
(OP)
Does anyone know what seismic force resisting system would be knee braced wood columns (for patio covers, decks, trellises and so on) (ASCE/SEI 7-10).I need to get an R. Or shall I just use lowest R=1.25 and I'll be safe ?
Even in ASCE 7-05 wasn't clear about this system. Am I missing something ?
Even in ASCE 7-05 wasn't clear about this system. Am I missing something ?






RE: ASCE/SEI 7-10 Table 12.2.1
I would only use this system if designed for low ductility (conventional construction). In a high seismic, high ductility application, the system would be rife with difficult to address buckling potential.
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RE: ASCE/SEI 7-10 Table 12.2.1
My problem is that these are wood beams and columns. There is no wood moment frame in Table 12.2.1. I just spoke to a plancheck engineer who says "use R = 1, you can't go wrong" but then I get seismic loads that are too big for my wood connections. The wood becomes too beefy, then my structure looks ridiculous, and so do I.
RE: ASCE/SEI 7-10 Table 12.2.1
There is no such thing as a wood moment frame. Wood members cannot transfer moments like wood or steel. Can each member be considered pinned and so it acts like a truss? The knee braces can transfer the lateral load into the column and put bending on the column, but as a point load and not a moment connection.
RE: ASCE/SEI 7-10 Table 12.2.1
RE: ASCE/SEI 7-10 Table 12.2.1
We recently designed a stair for a 1 story building and used R=1.0. Client requested seismic analysis.
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RE: ASCE/SEI 7-10 Table 12.2.1
RE: ASCE/SEI 7-10 Table 12.2.1
Thank you for looking into it.
RE: ASCE/SEI 7-10 Table 12.2.1
RE: ASCE/SEI 7-10 Table 12.2.1
However, it is not listed in table 12.14-1 in the Simplified Design Procedure section on page s 101 and 102.
Mike McCann
MMC Engineering
RE: ASCE/SEI 7-10 Table 12.2.1
Sometimes I think, I work too much.
Mike's comment is interesting. I wonder why that is. But either way, at least I have something to point to and 1.5 is somewhat better than 1.
Thank you.
RE: ASCE/SEI 7-10 Table 12.2.1
However, under section 12.6, all other structures must be designed by one of the methods outlined in Table 12.6-1. which use Table 12.2-1 for the building structural system description.
Mike McCann
MMC Engineering