Dear All!

I am modelling an RC Frame in DIANA FEA and comapring the results with the experimental data. I am using Material Model for Concrete for Compression as "Parabolic", For Tension as "JSCE Tension Stiffening", Crack Bandwith Specification as "Rots", Reduction Model as "Vecchio and Collins 1993", Shear Behaivor "Damage Based".

For Reinforcement using "Embedded Bar" and "Von Mises Plasticity".

The Graph i am getting is as attached. W.r.t The displacement, i am getting the trend with lower stength values than the experiment, but getting unnecessary jumps in strength values particularly after 20 mm displacement.

Kindly guide how to resolve the issue and calibrate the model numerically

Regards

Zeeshan Ahmad