Learning Forum

[Husam Farghal]

Hi Everyone,

I am modeling a wall that lies on a slab. I am applying a lateral load on the wall to achieve its failure pattern. I have already been able to achieve perfect convergence using the microplane model. The response of concrete shows it is compression and tension behavior with it is softening part, and steel shows elastoplastic behavior. The problem I am facing is how I can validate my results, I still have not tested the component. 

Also, my results keep changing when I try to play with the forcing or displacement option. When I used different boundary conditions it yielded different results and failure patterns and all of them are achieving full convergence. For Example, when I apply a fixed option at the end of the slab. that would give a specified failure pattern that gives the right strain ( around 0.004) and right stress in compression but the failure pattern does not look as supposed to be. the second boundary condition is restraining the slab from different faces from it is normal. it will give a more reasonable failure pattern but the starin is off( around 0.012) and the peak of compression behavior happens in the middle. I hope anyone could help me with this issue and give me an answer in term of behavior of the concrete and why does it behaves differently with different boundary conditions and which it should be validated? 

 

Thank you for help.

 

[dlooman]

The only way to validate a model is on geometries that are simple enough to permit an analytical solution.   See for example, Technology Showcase Example 49.  If the material model gives reasonable results for those tests, the interpretation of results on a more complex model is up to the user.