Steel01 Isotropic parameters

homashanehsaz · Post by **homashanehsaz** » Fri Feb 20, 2015 7:21 am

Hi.
My problem is about Steel01 four isotropic parameters. I want to know how these four parameters are used to make stress-strain diagram. How do they effect pressure and tension? I took a look at the some examples and arguments in OpenSees wiki figures but I could not find the exact equation for these parameters and stress strain relationship. Actually I saw that by increasing some parameters pressure goes up or down but I want to know this more by detail and equations.