Topic: Prestressing a Load application slab for testing
I am trying to model behavior of low rise wall specimens, and I am incorporating a clamping load using an external cable element to model the clamping that was required to attach the loading actuator to the specimen.
I have noticed, that when applying this prestressing load, the results after prestressing vary significantly dependent on how many steps over which I apply the load. Applied in one step, the cracking due to prestressing matched the observed behavior well, but if I apply the prestressing load over 100-200 steps, the prestressing load that results in cracking significantly increases.
Is there something in the external cable model that is step dependent as I am seeing? Nothing else is changed between the models, and I have confirmed that the same total cable load is achieved by the end of the model.