As with the Story Forces tab, the Base Shears & Torsions tab provides the option to either include or exclude the component of shear and torsion that is tributary to the bottom half of the lowest level. Whatever the reason, the values are reported on this tab if they are of interest. For some designers, the summation of the wind forces is useful in the checking process to get a confidence level that the calculated pressures are reasonable. Some designers like to see how the wind 'base shear' compares to the seismic base shear. Chapters provide an interpretation of these principles for. Although 'Base Shears' are not technically a part of the ASCE 7-10 design procedure for wind loads, the summation of all story forces is often of interest to designers for a variety of reasons. Known as the Twelve and Twelve, the book dedicates a chapter to each Step and each Tradition. Base Shears & Torsions This tab reports the summation of the wind story forces and torsions for all levels in the building, for all four 'Cases' and for the minimum required wind loads per Section 27.4.7. As of build 6.12.4.24, the program does not collect enough information to consider the 8 psf on the projection of the roof area, so this additional load may need to be considered with supplemental hand calculations on buildings with other than flat or low-slope roofs.
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