Circular RC Column — P-M Interaction Diagram (AASHTO LRFD)

Section Geometry

Diameter D (in)

Cover to hoop (in)

f'c (ksi)

fy (ksi)

No. of long. bars

Long. bar size

Hoop bar size

Case	Pu (kip)	Mu (k·ft)	ϕMn (k·ft)	Mu/ϕMn

Compression positive. ϕMn and ratio computed after update.

Member Cross-Section

Concrete Long. rebar Hoop

Green filled = factored (ϕP_n, ϕM_n) | Dashed blue = nominal (P_n, M_n) | ◆ = control points | ● = demand cases