Roland this being the case, thank you BTW, the loading on these braces exceeds the allowable load of 240 lbs for open web trusses based on manufacture data. I'm assuming, than, that I will need to add a brace on the branch line (1-1/2"), even though code does not call for it, to pick up the additional weight at the end of the straight run. Is this assumption, in your opinion, correct?
Thanks, BK -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roland Huggins Sent: Wednesday, February 04, 2009 4:52 PM To: [email protected] Subject: Re: Sway Bracing braces and their associated zone of influence are assigned to a straight run of pipe. Naturally this is not stated in the standard but if you can follow a little ciphering by Jethro, you'll arrive at the right answer. If you aren't a graduate of an Ivy league school, like Jethro (or Dubya), looking at A.9.3.5.3.1 should help. Roland On Feb 4, 2009, at 11:58 AM, Bob Knight wrote: > I have a hexagonical building that has branch lines gridded around the > hexagon. When considering my zone-of-influence for the sway bracing > do I need to consider the complete force of the branch line, which is > a hexagonical circle as it were, or do I just consider the branch line > up to the first change of direction in the hexagon? > > I don't see how the horizontal force from across the building is going > to impact the main when the force would be passing through 3 changes > of direction with each change of direction having a swing joint. > > So, I guess that my question is, when I sway brace the main do I > consider the load of the branch line up to the fist change of > direction, or do I consider the entire load around the building? > There is no secondary grid main, since the primary main acts as both. > > > Bob Knight, CET > (208) 318-3057 > [email protected] > www.firebyknight.com No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.0.233 / Virus Database: 270.10.18/1935 - Release Date: 02/04/09 16:35:00 _______________________________________________ Sprinklerforum mailing list http://lists.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)
