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There are inputs on each level to allow you to specify parameters that apply to all hold-downs on a single building level for the purpose of calculating the hold-down displacement component of shear wall deflection.
Length Subject to Shrinkage
This input indicates the total vertical extent of perpendicular-to-grain wood members spanned by the hold-down device. Typically the depth of the floor joists plus two top plates on the lower level and one bottom plate on the upper level. For ground level, it depends on the sill plate configuration. It is used in hold-down wood shrinkage calculations.
Anchor bolt length
This indicates the required length of the hold-down anchor bolt, if one exists for a particular hold-down. It is used to calculate additional elongation of the
It is typically the length subject to shrinkage plus flooring material thickness. However, in some situations it could be quite different, for example when wood I-joists are used. The I-joist web is included in the anchor bolt length but not in the length subject to shrinkage.
Context sensitive help
Each of these fields have context-sensitive help explaining their use, accessed via the question mark box at the top of the dialog box.
Refer to Hold-down Structure Input for more information.