The problem is as follows:
1. A reinforced concrete girder had been loaded up to 70% of ultimate load, then unloading to zero load. Hence, residual strains were developed in steel reinforcement and concrete. In addition, there is an existed crack.
2. after that, a CFRP laminates is added as new elements for retrofitting, and the girder is loaded up to failure.
3. How we can model this problem by FEM method (i.e., loading to 70%ultimate, unloading with residual (cracks, strains and deflection), adding new elements of CFRP, then reloading up to failure?
one day when i was in a conference somewhere, i heard about problem like this and one Canadian researcher suggests the death and life technique which is already existed in DIANA software.
Thank you Dr. Amjad for this important information. I will recheck that in DIANA software.
One of the ways to proceed is to consider the stiffness variations recorded during each of the test procedures. This will form the bases for the data for FEM modelling.
You have to use Birth and Death Technique in Ansys
First, choose elements which you wanna kill. Then write (ekill, all) in ansys command.
Check your live elements, (Entities - Elements - Live Elem's)
To use Birth order, choose elements which you wanna birth them. Then write in ansys command (ealive, all).
ANSYS program has the capability to model this case. The program can subject Sequential loading stages (loading, unloading, and then reloading) and can add elements in any stage.
Again , What about residual stresses and strains D rMohannad?
DR Mohannadm' What about residual stresses and strains, how can ANSYS treat that???
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