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Wind Load Design Procedure
Shearwalls provides a choice of methods for the generation of main wind force resisting system (MWFRS) loads on walls and roofs:
ASCE 7-16 Envelope (Low-rise) method
This method uses the combined external pressure coefficient and gust effect factor GCp from ASCE 7-16 Figure 28.3-1. If you choose this method and your building does not meet the limitations in ASCE 7 30.3 and 26.2, you will be warned upon load generation. Refer to ASCE 7 Envelope (Low-rise) Procedure for more details.
ASCE 7-16 Directional (All heights) method
This method implements load cases 1 and 2 from ASCE 7-16 Figure 27.3-8 and uses external pressure coefficients Cp from Figure 27.3-1. The gust effect factor G is taken from Section 26.11. Refer to ASCE 7 Directional (All heights) Procedure for more details.
For both these procedures, ASCE 7 Table 26.13-1 is used for internal pressure co-efficients, and Figure 30.3-1 for component and cladding loads on walls.
Design Options
Include deflection analysis
This checkbox is used to control whether the program calculates shear wall deflection and imposes story drift limitations. If it is not checked, the design will run more quickly, but the load and force distribution options are more limited. The ability to distribute loads to shear lines for rigid diaphragm analysis, and to distribute forces within shear lines, using rigidities derived from deflection analysis (stiffness), is not available.
Identical Materials and Construction on Shear Line
Worst-case rigid vs.flexible diaphragms (Envelope design)
Select this if you wish to have the program determine the strongest of the walls designed for forces distributed with the rigid diaphragm method as opposed to the flexible diaphragm method. This would be selected to conservatively address the semi-rigid condition by taking the worst of rigid and flexible design in an envelope approach.