Dear fmk, the stress shift equation in the steel02 model

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alexli
Posts: 25
Joined: Fri May 02, 2008 8:27 am

Dear fmk, the stress shift equation in the steel02 model

Post by alexli »

Dear fmk,
I notice the stress shift equation in the steel02 model in Opensees SRC seems not to the same as the equation in the report of Spacone. Where is the stress shift equation from? Could you give me some suggestions, please?
I want to become a good engineer
fmk
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Post by fmk »

are you talking about the initial values?
alexli
Posts: 25
Joined: Fri May 02, 2008 8:27 am

Post by alexli »

Dear fmk,
I mean the modified part by Filippou considering the isotropic hardening. the stress shift equation.
That is:
[[**double d1 = (epsmax - epsmin) / (2.0*(a4 * epsy));
double shft = 1.0 + a3 * pow(d1, 0.8);**]]
epss0 = (Fy * shft - Esh * epsy * shft - sigr + E0 * epsr) / (E0 - Esh);
sigs0 = Fy * shft + Esh * (epss0 - epsy * shft);
But in the Dissertation by Yassin, the corresponding equation is not the same as the above.
Best regards!
I want to become a good engineer
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