Richard, thank you very much for the resolution, but based on what was commented previously in this thread, the factor for vertical load is mentioned, based on this, the load combinations should also consider the effect of the vertical load?
The combinations should be like this?

P + T + W + 0.7U1 + 0.46U2 + 0.21U3
P + T + W-0.7U1 + 0.46U2 + 0.21U3
P + T + W + 0.7U3 + 0.46U2 + 0.21U1
P + T + W-0.7U3 + 0.46U2 + 0.21U1

I ask you because in a project we need to compare the SAP loads of a cable-stayed bridge that supports our pipeline with the Caesar II loads, and in the Civil load combinations do they consider the 3 directions in the same state of load? or is it not advisable to carry out the seismic analysis in this way?

We also load the earthquake spectrum that we have for this project in the dynamic module of Caesar II but the loads differ twice and three times with respect to the static one.

I appreciate your comments on the subject.