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Different hold-downs are designated in Shearwalls for the following different means of publishing displacement and capacity values. There are three possible sources of vertical hold-down displacement that affects shear wall deflection:
Similarly, the capacity of the hold-down takes into account the possible failure in tension of the bracket or strap, the anchor bolt in tension, and the connection of the horizontal fasteners to the wood studs.
The published data may include all or just some of these sources. For displacement, sources that are not included are calculated separately by Shearwalls. For capacity, sources that are not included are neglected by Shearwalls, with an appropriate warning message.
The hold-down displacement/capacity data source(s) used in Shearwalls are
Assembly Displacement/Capacity
Displacement values refer to entire hold-down – bracket or strap, anchor bolt, and horizontal fasteners. Capacity takes into account tensile capacity of brackets and straps, and wood-connection capacity of horizontal fasteners. Anchor bolt displacement applies to a maximum length, elongation of portion greater than that length is analysed separately.
These properties are set via options for each hold-down in the Hold-down Database Editor.