PINCHING4 Material

andrea79 · Post by **andrea79** » Tue Jul 10, 2012 11:25 pm

Hello,
I just started using OpenSees for my Ph.D thesis.
For considered the degradation under cyclic loading, I use PINCHING4 Material.
The cyclic degradation is defined by four parameters (for example: $gK1 $gK2 $gK3 $gK4 $gKLim).

My question is:
what is the difference between K1, K2, K3, K4, Klim?
who refers K1, ..., Klim?

thank you!