Dear Sillyman,

The answer to both your questions are:

1. No. But why you need CAESAR II for that? If you have the data which probably the hydraulics group in your company will generate for you, you just add the PXA values ( to elaborate it, sum the PXA at the right hand bend, left hand bend and at the upstream and downstream side of the valve, in case there is a valve b/w the bends) at each instant of time for which you have the data and this is the unbalanced force that instant.Remember that when you are using the area at upstream/downstream of the valve correct area is used depending on how much of the valve is closed.

2. Here also, you need the above data.

For time history analysis, your input will be different as you are basically " following" the waveform but in response spectrum analysis , time is not important the maximum value and the peak DLF are the key factors. However I think you are aware of this.

Regards