Forces Based On...

Here you choose between using the capacity of the shear wall or the design shear force when determining the forces used for hold-downs and drag strut design.

Note that the forces used to calculate hold-down deflections are always based on applied force rather than shear wall capacity, regardless of this setting.

CSA O86 11.4.4.1 says that hold-downs shall be designed to resist applied force, however certain seismic irregularities from NBC Table 4.1.8.6 call for the use of shear wall capacity rather than applied force in the overturning force calculation and for drag strut design.

Note that even if shear wall capacity is chosen as the method for shear line forces, in the calculation of the J_hd factor, the hold down forces Pij’ used to calculate the Rij, forces are calculated using the applied force , not the shear wall capacity.