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There are three possible sources of vertical hold-down displacement that affect shear wall deflection and three possible means of hold-down failure:
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.
Total Assembly Displacement/Capacity
The current standard practice is to publish displacement and capacity values for to entire hold-down – bracket or strap, anchor bolt, and fasteners into studs. 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.