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After the iterations described in Design Iterations Per Level are done for the Structural Design Iterations, on each wall or shear line the program does the following
Worst-case Selection
The program determines the strongest materials needed for wind vs. seismic design on each wall in the structure. If you have selected worst-case rigid vs. flexible diaphragm in the Design Settings, it does the same thing for these force distribution methods. The program then replaces the wall materials for each design case with the worst-case materials.
At this stage, the program also replaces the wall material in each wall designated as the same wall group for design with those of the strongest wall needed to withstand the forces applied to all the walls in the group.
Final Force Distribution
Then for each design case, forces are re-distributed to the shear lines and within the shear lines based on the capacities or stiffnesses of the walls for final design, and factors are applied to the shear line forces.
Design Check
The designed walls are then checked against the new forces, and the results reported in the Design Check output. This ensures that the output reports show the force distribution, the shear wall deflection, and shear wall design capacity from the set of walls that are showing in the report.
Note that the forces are for each separate design case, but the walls may have been designed using a different load case. The idea is to check the walls designed to withstand any case against each case of loading and structural assumptions.
Wall Design Failure
Although it rarely occurs, it is possible that the walls designed on the Wall Design Iteration iteration cannot withstand the forces created from the new rigidities and other factors. The design results report shows this situation, indicating via a warning message that the problem is a consequence of the design iterations and can be remedied by more manual input.