hello to everybody

- I'm a beginner in CAESAR II and I need simulate a model to seismic loads but I do not understand this:


Inputs:
frequency cutoff = 33 Hz.
damping coeff. = 0
Nš of frequencies = 100

I do not see frequencies greater than 1,0 Hz (or 1,1 Hz). Why?

- The other question is: I need to put a force in pipes due to the discharge of pressure relief valves. So what I do is, taking in consideration that the maximum design pressure is 1,95MPa and pipe has a NPS=12in, therefore the applied force in the pipe would be the result of this two conditions which is app. 25 MPa.
It seems to be exaggerated.
What am I doing wrong ?

If anyone can help me just let me know.
Thank in advance.
Drama