Step to hold bolt preload

[ParabolicTet]

I inherited an input deck that has this step after the first step of applying bolt pre-load. Unfortunately I am not sure I understand its purpose. fyi , node 90001 is a pre-tension node.


*STEP,INC=1
Step 2: Substitute bolt load with resultant length change
*STATIC
.1,1
*BOUNDARY, FIXED
900001, 1,
*CLOAD,OP=NEW
*END STEP

 

[Yoman228]

I belived that you have applied Cload to node 900001 in step 1.

what this step, it hold the node 900001 in a fix position and take away the loading on the driving node 900001.

The analysis assumed that the blot will not move after the per-stress.

 

[ParabolicTet]

I see, but isnt that over-constraining the model? How will the model deform globally if that node is fixed? Isn't it like adding a restraint at that node?