Mark,
I understand your point, however I still must disagree.
The applicable standard for those seismic requirements is ASCE7, and the
current edition of that document is the '05. That edition could not
possibly
reference the '07 edition of NFPA-13 as it had not been published yet.
I will grant the point that if your building is in seismic design categories
D, E or F that sway bracing of the system per the criteria in NFPA-13, 2002
is no longer the only requirement, however compliance with it is now just
one part of a more expanded set of requirements.
Those additional requirements entail accounting for the force and
displacement
sections of ASCE7, as well as limiting the allowable stress on the pipe
itself to
70% of the minimum specified yield strength.
That is my understanding of the criteria to be followed.
PARSLEY CONSULTING
Ken Wagoner, SET
760.745.6181 voice
760.745.0537 fax
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> e-mail
www.ParsleyConsulting.com <http://www.ParsleyConsulting.com> website
Eckard, Mark - Mark E wrote:
I was referring to the 2002 Edition of NFPA which is still adopted by a
majority of the US.
Mark E. Eckard S.E.T.
Engineering Manager
Lowe's Companies
1605 Curtis Bridge Road
REEC Dock
Wilkesboro, N.C. 28697
Phone: (336) 658-4359
Fax: (336) 658-3257
Cell: (336) 467-0194
Email: [EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Wednesday, May 28, 2008 1:14 PM
To: [email protected]
Subject: Re: Seismic Calcs
Mark,
Can you give me some background on where you've come to this conclusion
on seismic design category D and higher not being
within the scope of NFPA-13? My latest ASCE7 manual seems to suggest
otherwise.
PARSLEY CONSULTING
Ken Wagoner, SET
760.745.6181 voice
760.745.0537 fax
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> e-mail
www.ParsleyConsulting.com <http://www.ParsleyConsulting.com> website
Eckard, Mark - Mark E wrote:
Another issue with seismic bracing design and calculation is the fact
that NFPA 13 only applies to seismic design category A, B, & C.
Categories "A" and "B" usually do not require bracing unless it is a
local jurisdictional requirement to brace everything. Seismic design
category D and higher are out of the scope of NFPA-13 and require
design
by a Professional Engineer. So in summary NFPA is good for Seismic
design category "C".
I have come to realize that quite a large number of designers don't
realize this.
Mark E. Eckard S.E.T.
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