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How to consider cracking in concrete using FEM?

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I have a bridge model in FEA software, 3 spans, both of the piers are RC, Steel box girder, upper part RC. I wanted to see cracking effect in the RC piers and slab but I couldn't. Results are a bit suspicious. I tried it with Nastran but I heard that Nastran cant consider cracking effect. Is there any FEA software which also considers that? Or any other methods? Thanks a lot for and idea or criticism.
Ozturk (Civil Engr.)
Tokyo - Japan