I am looking for some clarification regarding the seismic load calculation for a pipe support anchorage design. The scenario is a pipe submerged in a water-filled concrete basin which is located in a high seismic region and experiences sloshing. In such a scenario, I understand that the pipe and its supports should be acted upon by the following 3 seismic loads:<o:p></o:p>

- The 1
^{st} seismic load acting on the pipe and its supports is the seismic response of the pipe itself. This load is calculated per Chapter 13 of ASCE 7-16, Table 13.6-1 of which provides R and Ω_{0} factors for different piping systems. <o:p></o:p>
- The 2
^{nd} seismic load acting on the pipe is the impulsive load of water sloshing. The impulsive load is calculated based on Chapter 15 of ASCE 7-16, Table 15.4-2 of which provides R and Ω_{0} factors for different tanks.<o:p></o:p>
- The 3
^{rd} seismic load acting on the pipe is the convective load of water sloshing. The convective load is calculated based on Chapter 15 of ASCE 7-16 with an R=1.5 (which is implicitly included in Eqn. 15.7-6). I have not found an Ω_{0} factor in ASCE 7-16 for the convective loads (if there is one and I have missed it, I would appreciate it if you could point me to it for my information).<o:p></o:p>

<o:p> </o:p>

Specifically for the design of the pipe support anchorage: the seismic load from the seismic response of the pipe itself (Seismic Load #1 listed above) needs to be multiplied by the Ω_{0} factor provided by Table 13.6-1; do the impulsive and convective loads on the pipe need to be multiplied by an Ω_{0} factor too? If yes, which Ω_{0} factor would be appropriate in that case?<o:p></o:p>

Thanks,<o:p></o:p>

Kostis Oikonomou

#ASCE7-16#Seismic#LoadCombinations------------------------------

Konstantinos Oikonomou Ph.D., P.E., M.ASCE

Senior Engineer I

Mesa AZ

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