Hold-down Displacement

The last term in the deflection equation relates to the displacement of the shear wall anchorage devices and the movement of the wood material at the hold-down location. The following subtopics give the various components which are added to give vertical hold-down displacement d_a.

Note that since the hold-down deflection is based on serviceability limit state forces, it is possible for the hold-down deflection to be zero even when there is an ultimate limit state force, thus the need for a hold-down device. This is because the combined dead and overturning force is negative for deflection but positive for hold-down design. This happens only rarely.