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Getting abrupt change in stresses while performing non linear Analysis

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Prashant Motwani

Prashant Motwani

Structural
Joined
Mar 14, 2017
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Location
IN
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
 
 http://files.engineering.com/getfile.aspx?folder=5aa30238-a2e2-4e11-b10b-f297141d8a70&file=Capture.PNG
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