I am modelling RC beam-column joint. In CDP model, when i gave only compression damage evolution criteria model is working fine but when i entered tension damage criteria too, it is showing convergence problem. Is it due to excessive cracking in tension?
Kindly give some advice..
Dear Udita,
You have not define clearly about the problem. as i understood you want to model RC beam - column joint. Joint behaviour is localized phenomenon under the applied load. You tell me the joint is subjecting to tension load or compression load. The joint response under tension can predict by using the interface element. Did you simulate the joint with interface element. The set convergence criteria for tension may not work well with out interface element. So, you try to introduce interface element b/w beam and column. Assign the interface properties mainly the normal and shear stiffness of the interface element. Hope you understand the importance of joint element (Interface element) role mainly for tension. All the best in your research..
Dear Udita
The statement is not clear enough. Did you model a contact problem? In this case, the conditions for contact may influence the convergence of the solution. If not, then you can try increasing the degree of interpolation polynomials on each element. Obviously you can also consider other convergence criteria. The geometry of the joint must also be re-examined, which may result in over-evaluation of the voltage (false stress concentrators - do not take into account the convergence stresses in such concentrators, eliminate them). The case must be examined in detail.
Good luck !
With particular respect,
Cardei Petru
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