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Since the capacity ratios are not calculated by considering only one effect (axial force or moment), there may be differences in the capacity ratios. For example, in the interaction curve shown in the figure below, let the capacity line shown in blue color is Axial Force weighted, and the line shown in red is weighted with the moment effect. In the case shown by the blue line, the design ratio will be OK E / OD E. The ratio for the case shown by the red line arrows M / OD M will be. In this case OK E / OD E > OK M / OD Mis found as. The design ratio of the blue line is smaller than the design ratio of the red line, although the axial force in the loading state of the blue line is greater than that of the red line. In this case, a design ratio made by considering only the axial force effect and axial capacity would not give the correct behavior.
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