Nonlinear calculation

Non-linear analysis

When the setting per material is done, user reinforcement via 2D meshes is inputted or not and non-linear combination is defined then non-linear analysis can be run. As has been mentioned before this type of calculation is available for Post processing environment "v17" only.

The mesh size is always a significant factor for Finite Element calculation method and mainly for nonlinear analysis. After several kind of testing we recommend to set mesh size = h/2 for steel fibre reinforced concrete and mesh size = h for combined reinforcement (steel fibre reinforced concrete + standard reinforcement) .

There is used standard Newton-Raphson method for solving of this physical nonlinear problem with recommendation of 10 increments of loads and 500 iterations in each load increment

When load is too high and no equilibrium is found in certain increment of load with reaching of maximum number of iterations, the user is informed about this with warning .

Besides, the nonlinear calculation uses very efficient damage material model called Mazars model [3] Mazars. This material model is very well applicable for material diagram with peaks and descending stress-strain diagrams.