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Getting abrupt change in stresses while performing non linear Analysis

Getting abrupt change in stresses while performing non linear Analysis

Getting abrupt change in stresses while performing non linear Analysis

(OP)
Hello,
I am modeling FRP strands in Prestressed Concrete in ABAQUS. FRP has been defined as orthotropic material whereas concrete as isotropic. The linear analysis results were decent and I was able to relate the results with experiment. however, when i defined the CDP model for concrete (FRP strands were linear only as they are not expected to go in non-linear range during analysis), i am getting stress paterns shown in attached image.
What could be the reason for this?

Any help will be appreciated

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