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Seismic Design for Distribution Systems in Buildings

Question asked by duhanportakal on Feb 14, 2020
Latest reply on Feb 17, 2020 by milt.werner

Hello Everyone,


I would like to ask a question about seismic design for distribution systems in buildings. According to NFPA 13 (2019), 

"shared support structure (such as trapeze assembly etc.) shall be permitted to support both the gravity loads adressed in and the seismic loads addressed in 18.5.9. And also, when a shared support structure is used to support gravity and seismic loads, the structure shall be designed to support these loads for all pipe and distribution systems on the structure using either or with an importance factor, Ip, of 1.5 being applied to all of the distribution systems."

So, the question is: Is additional seismic bracing required for these distribution systems when I used trapeze assembly shown in attached to support gravity and seismic load for these systems?


Thanks in advance,