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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 = F...

Dear fmk,
I mean the /*stress shift part*/ introduced by Prof. Filippou. I checked the Report by Spacone and Dissertiation by Yassin. the stress shift equation seems simpler than the equation in the source code.

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?

hello,
I have read the source code of steel02 of Opensees. I found that the stress shift equation in the source code seems not to be the same as the papers by Spacone and also Yasshin. Thank you very much!
Best regards!

hello fmk, some naive questions: 1) I know the Bresler gives an interaction equation for the RC beam section. has opensees covered this model? the bidirectional section command? 2) I notice the Bresler' model is associated with lumped plasticity beam very often. Can the model also apply to distribut...

Thank you for your help！

Hello fmk,

can the the stiffness be secant stiffness? and the commit state() and revert to last commit() what are their function? Thank you ahead!
Best wishes,
Alexli

I have the paper:)

Dear fmk, in some documentations on the DLL, two files are referred to: LIB file and DLL file. The LIB file contain the exported function 's name and address; and the DLL file which contain the functions and data. My question and confusion is that: 1)the LIB file is necesary? 2)and the documentation...

in some documentations on the DLL, two files are referred to: LIB file and DLL file. The LIB file contain the exported function 's name and address; and the DLL file which contain the functions and data. My question and confusion is that: 1)the LIB file is necesary? 2)and the documentation also said...

Hello frank,
I am a greenhand. I want to add a new material into opensees using C++. In the [b]opensees dynamic API[/b], dynamic libary is referred. Does that mean just using the DLL one can introduce the new material into Opensees? Thank you very much!

Best wishes!

Thank you very much

Hi all, these days ,I read some papers about the beam-column element mode. I find there were many types of beam elment mode. i.e.: lumped hinge model, fiber section model ,and single componnet model ,multicomponent model,and so on. I am a little confused about this field. who can give me a clear rev...

Thank you very much!
Could you explain a little of the reason? I have a limited knowlege about the FEM, sorry!

Hi all,
In the general-purpose program, such as abaqus adina, there are some concrete models in the material libray. if we use them in the beam element,I also can get the result. So, what is the difference between the result and that we get using the fiber model and plastic hinge model?