Hello

1.
I'd like to know how the static loads are combined with the dynamic loads.
e.g. STATIC ± DYNAMIC

2.
I input nothing in the black of the anchor movement at spectrum load case,
even if I select Yes include psedostatic components at control parameter
in case of seismic.
How does CAESAR program decide the value of the anchor movement?

In my case, I could know stess became too high.

Thank you~

Answer :
1. Static restraint loeds have signs.
Example Y support at weight - 2500 N
Dynamic loads have +;- signs .
Caesar give only + signs out
Example Y 1300 N
Combination static + dynamic ( -2500+1300 ) = +1200 N
Thats was Caesar do .
I dont know Caesar can do static -dynamic ( -2500-1300) = -2800 N
I think you must do self.

2. If you set no anchor movement = 0 or empty field, then set the Parameter include anchor movement to NO !!
Anchor movement is your input if you have one.
Example: 2 buildings between a pipe
Buildings shake at dynamic different , then you have between the restraints
different movements ( call anchor movements)
Dynamic answers come from sum of modal masses and Pseuto static components until 100 % Masses.
Pseuso static components come from accelerations right side your spectrum ( high frequencys).

For spectrum dynamics, the results can be positive or negative (since somewhere along the way an SRSS was performed). This is why the dynamic results are all positive.

For combining (Static + Dynamic) the absolute value of the static results is added to the dynamic results (which are positive due to the SRSS). This gives the worst case, which can be either positive or negative.

The only time the psuedo-static displacements (anchor movements) come into play is when you're doing an ISM (independent support motion) run. If you leave the value blank, CAESAR II computes a default based on the the last frequency value of the associated spectrum.

This is all in the documentation.

Thats right Richard this is the worst case.
But a Y vertical restraint with Bracket will see different Vertikal loads
example : -Y 2000 N and a lower +Y Force, because ( Y force dynamic - Y Force static) for the Bracket.