As I understand force and motion in this application NFPA allows omission of EQ bracing when using short rods because differential movement between the building and the mass of the system is so limited that they can be considered to move in union. I would be concerned about the attachment of the knee brace to the wall in that tension and shear forces against the fasteners may be far greater than those imparted to purely vertical supports. Of course this is something that logic suggests to me and that becomes a muddy road when discussing physics. Now is when we need the engineers.
On Fri, Jul 30, 2010 at 5:49 AM, Parsley Consulting <[email protected]> wrote: > John, > > It would seem to meet the letter of the standard in section 9.3.5.3.9. Do > you see something there that gives you some concern about omitting lateral > bracing? > > 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 > > IMPORTANT NOTICE: This correspondence is not a Formal > Interpretation issued pursuant to NFPA Regulations. Any opinion > expressed is the personal opinion of the author and does not necessarily > represent the official position of the NFPA or its Technical Committees. > In addition, this correspondence is neither intended, nor should it be > > relied upon, to provide professional consultation or services. > > > > > > John Reilly wrote: >> >> Please offer an opinion on bracing 6" sched. 10 main to a concrete wall. >> The method of attachment is a knee brace with a short rod and ring so that >> lateral bracing is not required. >> >> For the record, this is not my design. >> >> J. Reilly >> [email protected] >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum >> >> For Technical Assistance, send an email to: [email protected] >> >> To Unsubscribe, send an email to:[email protected] >> (Put the word unsubscribe in the subject field) >> ------------------------------------------------------------------------ >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com Version: 8.5.441 / Virus Database: >> 271.1.1/3037 - Release Date: 07/29/10 18:34:00 >> >> > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > -- Ron Greenman Instructor Fire Protection Engineering Bates Technical College Tacoma, WA Member: AFT WA 4184/AFL-CIO, SFPE, ASCET, NFPA, AFSA, NFSA AFAA, NIBS, WSAFM, WFC _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
