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The program calculated a combined axial and bending ratio for CSA O86 5.5.10 even when the secondary moment ratio Pf/Pe was greater than one.
A Pf/Pe ratio approaching one causes the design ratio to approach infinity, indicating extreme failure for high Pf/Pe, but a Pf/Pe greater than one caused the design ratio to improve, or be negative rather than indicate a failure. A Pf/Pe greater than one instead now indicates a failure on its own account. The program in this case outputs the design ratio of Pf/Pe rather than the full interaction equation in 5.5.10.
In almost all cases, the program will fail due to tension alone when this occurs due to high Pf.