Dear All,

I am currently doing stress analysis for Underground Piping in Process Piping Plant.

Pipe line condition:
Size :16"
T Design : 37 C degree
Buried depth to top of pipe : 1500 mm
Soil type : CLAY

Queries:
1. When I analyze my underground pipes, do I have to consider seismic/ earthquake load?

I thought that when earthquake occurs then my whole pipe will move along the soil/ ground and there will be no displacement of the pipe changes the another pipe. I mean when soil/ground accelerated by seismic, then my whole pipe will experience the same acceleration to the ground.

2. Regarding to Virtual Anchor Point, stated that is a point that "no movement" where frictional resistance Ff = thermal force Ft.
I have about 572m straight pipe, and I did not find a point where the displacement is zero in my CAESAR II report.
Did I wrong modeling my underground pipe? where the possibilities my mistake?

I am new in this. Thank You for your kindly reply.

Regards,
MMP