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thx . I used Matlab, and it helped. The section should have been rotated 90 degrees.

I need to model double back to back UNP sections with back-to-back distance of 25.4 mm. I used fiberSec to do so .To test the accuracy of the section which was built, I modeled a frame with 1 bay 1 story. But there's difference between fundamenal period in elastic model and this model. Also when I c...