Hello,

I am running the time history analysis in CAESAR II for steam hammer analysis of Main steam piping of coal fired boiler. For defining the force sets in time history, there are various options provided in the CAESAR II technical manual. this was working well for the piping having straight legs. however, for the piping leg having skewed (running in 2 directions), the results are not coming properly. I am getting two different results, if the directions are defined at one force set having both the directions and two separate force sets having one direction per force set.

for example, pipe is running in -X,Z axis at an angle of 45Deg. (Y axis being vertical)
Force set Case 1:
(-0.707,0,0.707) acting at node 10 with force F1
Force set Case 2:
(-0.707,0,0) acting at node 10 with F1
(0,0,0.707) acting at node 10 with F1.

kindly clarify, which one is the suitable definition and why?

thank you in advance...