Output SPCFORCE

I want to output SPCFORCE of my constraint

 

Step 1 

I have set

 

 

Step 2 

I output boundary total force and I don't want to separate direction.

So I set Mag of here

 

 

Step 3

I choose nodes in my constraint 

 

 

Step 4

Then I output all of them data like this then do the summed of the all nodes data so I can get the area total force of my constraint

 

 

 

I just want to ask. Do I use the SPCFORCE right?

 

 

 

 

And other questions are about:

 

1. If my constraint area is 700mm^2 but I just want to see the constraint area force about 350mm^2

 

So if I just output the choosen area 350mm^2 it also output this area's SPC force. Then when I summed them it is my area 350mm^2's SPC force.

 

Is this idea right?

 

2. I have found that SPCFORCE can't support small displacement?

 

But at this time when I output it will have value.

 

3. If I use Option→Set  then choose the SPC which I set

How should I read the set's SPC force in hyperview.