In the AISC Seismic Design Manual design examples for SCBF I am not understanding the f peak and f avg on the welds. At the chevron gusset plate, figure 3-13, the weld has shear,axial and bending. In determing the average, the axial and bending are conbined. The bending has a + or - sign associated with it, but because the axial is very small and the quantity fa +/- fb is squared, the signs are lost and the average is equal to the peak. Later when they are checking the gusset to beam or column connection in figure 3-16, they state that because there is no bending, the peak is the average. This seems to be incorrect at the chevron connection in figure 3-13. Can anyone enlighten me on this seemingly discrepancy?
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