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The program calculates the over-capacity coefficient Ci for each storey from O86 11.8.2 and shows it in the Overcapacity column of the Storey Drift table. This coefficient is just the ratio of shear resistance to shear force on the storey.
For structures three or more storeys in height and when IEFaSa(0.2 < 0.35), the ratio of overcapacity for level 2 to level 1 is shown at the bottom of the table. A note below indicates that it is within the acceptable range of 0.9 and 1.2 from 11.8.3.2, and a warning is issued if it is outside that range. A failure due to overcapacity also appears in the Design Summary,.
According to 11.8.4.2, the Ci coefficient is to be applied to the design of diaphragms. Shearwalls does not design diaphragms, but the factor is shown for your information.
The program does not check to verify that the Rd and Ro coefficients specified in the NBC for wood light frame SFRS was used to generate the shear force, as required in the definition of Ci. It is possible to change these values in the Site Information Dialog.