• Registered: 29-12-2009
  • Posts: 9

Topic: about reinforced concrete shear wall

Dear Borek,

I attempt to analyze a reinforced concrete shear wall. I've read your suggestion in this link:
http://www.oofem.org/forum/viewtopic.php?id=285

bp wrote:

Concerning the model for concrete:
The choice of models for concrete capturing the nonlinear behavior in compression and tension is limited.
I would suggest to use either Mazars model (still isotropic damage, but tensile and compressive damage are taken into account) or much more general microplane model.
For the steel, you can use "j2mat" material model, implementing j2 plasticity with hardening. (Now I figured out that it is not documented!).

I am wondering whether it is necessary for user to simulate a concrete wall and then add some steel elements? Is there any way for me to use just one material model(e.g Concrete2)?

Thank you for your help.

ZX

2 Reply by bp

  • bp
  • Administrator
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  • From: Prague, Czech Rep.
  • Registered: 02-03-2007
  • Posts: 1,047

Re: about reinforced concrete shear wall

Dear ZX,

the "Conctere2" model is suitable only for plates and shells. The fact, that it can capture the behavior of reinforced concrete, may look as an advantage - all is included. On the other hand, if you want to change plasticity model for reinforcement, add bond slipping, etc, you have to change the material model itself as this is hard-coded in the model.
That's why we prefer to build the model from individual, well defined, components (concrete, steel reinforcement, bond-slip links, etc), as you can easily add any feature, exchange individual models, etc. As a result, the is no alternative for "Concrete2" model for walls. Perhaps you can use orthotropic linear material for linear range, but if you want to capture nonlinear part, you have to model all components explicitly.

Borek.

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