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Seismic Drag Strut Force Factor

Seismic drag strut forces based on applied loads are increased 20% as per 9.8.6. Note that this is not contingent on the value of IEFaSa(0.2), as per 9.8.7.3. The legend under the Drag Strut Forces table has been revised to reflect this.

Capacity vs Applied Load

This factor is not applied if shearwall capacity is used to create drag strut forces, rather than applied loads. However if 1.2 x applied load is greater than shearline capacity, that value is used and a note below the Drag Strut Forces table indicates this.

Elevation View

The legend in Elevation view shows the 1.2 factor and 9.8.6 reference.

See Also

CSA O86 Design Standard

Deflection of Shearwalls

Over-capacity Coefficient

Hold-downs in High Seismic Zones

Unblocked Shearwall Limitations

Importance Factor

OSB Type 2 Sheathing

Update to NBC 2010 from NBC 2005