I'm trying to model a single tied rigid rocking block using self-centering mechanism. Analysis is done in two stages; first, the block's weight then, a lateral load continuing from the previous case. In the first stage, vertical displacements of bottom nodes are approximately zero which was expected due to the rigidity of column and gap elements but in the second stage, vertical displacements are high values.
I think I'm making a mistake modeling the self-centering steel tendon including defining post-tensioning force. I was wondering if I could get a sample model to see how it's modeled or any advice.
You have to model your PT cable with PPGap material in conjunction with initstrain material.
before performing any gravity or pushover analysis, first perform a load control analysis (without assigning any load), so that the post tensioning force would be developed.
check the cable force at this stage to see if the problem is related to post tensioning or restraints.
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