Abaqus force displacement curve never collapse

[mohkml]

i have a model for steel bolted connection , the load is acting as a displacement on the edge of the beam
firstly, the p delata curve steel increasing with time without any decline as per experimental test , any solution ?
secondly, intial stiffness not matching with experiment


thank you

 

[Erik Panos Kostson]

It is almost impossible to say exactly why this is, without looking at a model (and test data, assumptions,...).

So one could start by checking everything in the model, that is elements, links/MPC, loads and restraints, connectivity, material and section properties, contact definitions, nonlinear material properties, and many other things that are relevant …….

If that is exacty the same or at least close to the the test and reality, then start with solver checks (convergence, contact status, residuals, plastic regions,......).

And so on.