be a conflict between IBC 2006 Section 2205.2.2, which states that
seismic detailing of structural steel is required in SDC D, E and F, and
ASCE 7-05.
Since we're doing mostly industrial, petrochemical and refinery work, we
frequently make reference to Chapter 15 of ASCE 7. In Table 15.4-1 of
ASCE 7, it allows the use of R = 1.5 for ordinary concentrically-braced
steel frames in SDC "D" when you don't want to use the Seismic
Provisions of AISC 341-05. This fellow has taken to doing this in all
cases so that they don't have to worry about all the detailing
provisions - in essence, they can just do a "normal" frame for
equipments supports, platforms, etc. You end up with potentially heavier
foundations - eh, it's just concrete - and maybe a bit more steel, but
you don't have to worry about all the detailing for ductile behavior,
goes that theory.
I, however, believe that Section 2205.2.2 of IBC 2006 takes precedence,
and overrules ASCE 7 on this score. Of course, you can still use R = 1.5
if you want to, but you're still going to have to do the detailing.
My friend claims I'm "reading it wrong," and seems to feel that the IBC
2006 applies ONLY to Chapter 12, and that Chapter 15 is another kettle
of fish, so to speak. I respond that Chapter 15 specifically says that
it's provisions are to be used IN ADDITION to those of Chapter 12, to
handle non-building structures.
And so back and forth it goes, with no resolution in sight. I think this
guy is very "ASCE 7" oriented, whereas I'm more inclined to look at the
hierarchy of the documents - IBC 2006 incorporates ASCE 7-05, not the
other way around.
Comments?
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