Hello everyone,

Is it possible, during a calculation, to introduce an initial force into a spring before starting the ASE calculations, in order to take into account the history of a previous load case (LC)?

Thank you in advance for your help!

Check out `syst PLC xxx`

in ase

I have two springs, each with its own Worklaw: one for dealing with permanent loads and the other for short-term loads.

I want to account for the displacement of the spring under the effect of permanent loads and consider it when calculating the short-term loads.

I tried with the PLC, but nothing happens!

OMRI_modifié.dat (91.4 KB)

Hello Omri,

the pre-deformation of the spring elements can be considered with the SYST PROB NOLN PLC nnn command where nnn is the primary load casem stress-strain condition will be taken into account.

The chapter you have quoted is how not to consider the pre-deformation. That can be achieved via the FACV item in the SYST command.

One more hint. When you want to account for the displacement of the spring under the effect of permanent loads and then consider it when calculating the short-term loads the spring must be activated from the very beginning till the very last construction stage. As soon as you deactivate an element, its stress-strain state cannot be recalled later on.

Thank you very much for the explanation.

For example, if I have a spring that has reached its load capacity under permanent loads, logically, under short-term loads, it shouldn’t work anymore since it has already reached its force capacity, but the displacement continues to increase.

To verify this, I created a set of load cases (LC), and logically, with this code for calculating the effects of each LCi, it should take into account all the effects of the previously applied LCs, but it gives me the same result, without considering the effects of the previous LCs.

Sorry, but I do not understand the problem then. Can you please simplify the model to one beam element with one set of springs and delete the loops as well as the unnecessary tasks from it. That might enable me to understand what is going on in the model.

I simplified the model. I introduced an LC1 and two load cases, LC2 and LC3, which are copies of LC1.

I calculate LC2 by taking into account ‘SYST PROB nonl PLC 1’, while LC3 is a classic nonlinear calculation.

OK, for the spring displacement under LC2, there is a difference in displacement compared to LC3.

But my problem is that the springs have a force limit capacity, and I want LC2 to also consider that the spring is working at 100% under LC1, so it doesn’t take any additional load

Spring Work Law _OMRI.dat (29.1 KB)