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 18.104.22.168 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 22.214.171.124 or 126.96.36.199 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,