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Shearwalls automatically distributes loads applied to a building face on a building level to the shear lines perpendicular to that face to create shear line forces.
The program uses the flexible diaphragm method and the rigid diaphragm method to apportion the diaphragm force to the shear lines. If you choose Worst case rigid vs flexible design setting, the program designs each shear wall to resist both sets of forces, otherwise the program designs separate sets of shear walls for each of these methods. The rigid diaphragm method is based on torsional analysis, and there are some cases that torsional moments are applied to flexible diaphragms.
Torsional Analysis
When using torsional analysis, the design standards specify the percentage of direct forces from each direction and additional torsional moments to be added, these are summarized in Load Type and Diaphragm Flexibility Cases.
Load Factors
The applied loads are not factored, other than by the Importance Factor I used in generating loads. Upon creating shear line forces, Shearwalls applies the appropriate load combination factors. Later on, during design, other design factors may be added and possibly change the shear line force values displayed on the screen. Refer to Factors Applied to Shear Line Forces for more details.
Further Force Creation and Distribution
Once the shear line forces are created, the program distributes the point shear force along the shear line to create
These forces are further processed to create hold-down forces, drag strut forces, , and force transfer strap/blocking forces at the appropriate locations.
Output
Forces created using either method can be chosen for display in the Plan view or Elevation view, and the performance of the shear wall design with respect to forces from either or both methods can be displayed in the Design Results.