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The shear overturning component of the tensile hold-down force is calculated by the balancing the moments about the compression force location at the other end of the wall. One moment is due to the shear line design shear at the top of the wall and the other due to the tensile force in the hold-down. For compression forces, the moment is taken about the hold-down and balances shear and compressive reaction to the chord force.
The hold-down force is constant for all locations along a shear line in the case that shear is distributed according to wall capacity and the walls are all constructed from similar materials; otherwise forces can be different along the shear line.
Separate shear overturning components and separate combined hold-down and compression forces are generated for wind loads and seismic loads,in each direction, and for the rigid and flexible methods, so that eight different hold-down design cases are calculated. They are shown separately in four output tables; you must manually compare to get the worst case.
Applied Shear vs Shear Capacity
A Design Setting permits you to specify which shear value to use, the induced shear v or the shear wall's capacity. This is described more fully in Applied Shear vs Shear Capacity.