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Re: Plan bracings for beams in SDC 'D'

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Per ASCE 7-05 Table 15.4-1 if your piperack is less than 65 feet tall than you could use an R value of 3.25 (see footnote b).  Although not specifically spelled out in the code, the typical resolution is to use a double story X bracing or add vertical "zipper-columns" and ignore the horizontal brace support criteria.

Thomas Hunt, S.E.

"Vasu, Ravi" <Ravi.Vasu(--nospam--at)>
02/10/2010 09:24 AM
Please respond to seaint
Plan bracings for beams in SDC 'D'

I have a piperack with longitudinal bracings(inverted V) in OCBF(R = 2.5).  Per AISC 341 section 14.3, the bracing point at the
center of the beam needs plan bracings to satisfy Specification eqn. A-6-7 & A-6-8 (Appendix 6).  
I have few bents (chevron) braced in the other direction also.
My question is, do we need to give the plan bracings for beams at all the chevron bracings connection ?  
Is there any exception/general practice for Piperack to satisfy this clause?
Thanks for your time & reply.
Ravi Vasu

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