Moment-curvature analysis for hollow prestressed-concrete piles

[Muhamad Fauzi Darmawan]

I have tried to follow the steps on this following link from csi wiki page, but the prestressed still don't work. The interaction diagram & moment curvature curve of with and without tendon force, just same

https://wiki.csiamerica.com/display...nalysis+for+hollow+prestressed-concrete+piles

Is the any solution? Thanks