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Hello, I drew some analytic stress-strain curves using Chang and Mander 1994 model. It is quite obvious the confined concrete should have always a higher stress. However, when I plot my results the confined concrete has less stress than the unconfined concrete in the initial slope of the curve! :sho...

Thanks vesna,

Yes. So there is the same typo in the OpenSees Command Manual in the explanation of the Concrete 07 uniaxial material.
Although the version I looked in is the one from may 2009.

Hello all, While I was studying about the uniaxial material "Concrete 07" I found the Chang and Mander NCEER report in 1994. Looking at the expressions they recommend for a complete stress-strain curve for unconfined concrete I found the following: epsilon'c = f'c ^ (1/4) / 4000 (psi) epsi...