prestressed pile interaction diagram
 

prestressed pile interaction diagram
i need to prepare an interaction diagram for 14" square prestressed concrete pile with 6, 1/2"dia 7 wire low relaxation grade 270 strands. anyone has information of where to find interaction diagram?
any help appreciated. thanks
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see chapter 5.22, members subjected to combined axial load and flexure, chapter 5.23, examples of calculating m-n diagrams, page 235-242 of "prestressed concrete structures" by michael p. collins and denis mitchell.