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The building face between each set of adjacent shear lines is modeled as a simply supported beam. The shear lines at each end are seen as pinned supports. The loads striking the building are distributed via statics to each of these "beams". Cantilevered loads representing, for example, overhanging eaves or open-front buildings, go entirely into the adjacent support.
Using this method, if there are no cantilevers, the centroid of the shear line forces is the same as the centroid of the applied force. When there are non-symmetric cantilevers, the centroid of the shear line forces is displaced from that of the applied loads.
Torsional Moments
When design codes require that a torsional moment be added to the building to model unbalanced load effects, Shearwalls adds this moment to the forces determined via the flexible diaphragm procedure as described in Torsional Analysis for Flexible Diaphragms
User-applied Shear Line Force
Shear line forces that you apply yourself in Load Input View, for example to model the affect of adjoining structures, are added to the forces derived from flexible diaphragm loads analysis.
Collectors
The flexible method assumes that for irregularly shaped buildings, there is a drag strut or other force collection system bridging any gaps in the shear walls along a given shear line. Shear walls calculates drag strut forces; it is your responsibility to design these force collectors and any connections to or within them.