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prestressed concrete pile interaction charts

Thread starter holiver77
Start date Mar 10, 2004

Status: Not open for further replies.

Mar 10, 2004

holiver77

Structural

Why is there a kink in the PCI interaction charts for Pn < 0 (pile is in tension) even though the phi factor for tension (=0.9) remains constant for all cases of axial tension/moment pairs?
I understand the kink on the compression side comes from the phi factor changing linearly from 0.7 to 0.9 at zero axial load.

Any ideas?

The PCI interaction charts I am using are from thr PCI committee report on prestressed concrete piling (March 1993).

Thanks for any help!