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Hold-downs Data Group
There is similar input for hold-downs at two places in the program – the Wall Input form and Opening Input form. In each place, a hold-down data group contains the following input fields:
Hold-down drop-list
For both left and right ends, used to select the hold-down to be used from the list in the database.
Single- or double-bracket
A checkbox indicates that the hold-down is double bracket, that is, the displacement and maximum anchor bolt length entered in the hold-down database applies to only one-half of the assembly, and is doubled for the hold-down assembly used.
Apply to Openings
When this is checked, the inputs apply to all openings on the wall as well as the wall end studs, saving you the effort of updating all the openings manually.
The input of these data applies to all selected walls.
Framing Input
The following has been added to the Framing data group of the wall input view:
Grade
The grade value is now active for all materials. Previously it was active only for MSR and MEL, for which grade data is needed for the specific gravity, which affects for shearwall capacity.
Thickness and Width
In wall input view, the stud thickness (b dimension) and width ( d dimension) is input, either by selecting from a list of nominal sections from the database or by typing your own actual value in. The input control behaves in a similar manner to the Width and Depth input in Sizer.
Note that the thickness (b) and width (d) terminology for studs is consistent with product literature, and should not be confused with the width (b) and depth (d) terminology for all members in Sizer.
It is assumed to apply to all studs in the wall, including those at openings and wall ends (which can be built-up from more than one stud.)
Number of End Studs
Typically wall ends are at least doubled and at times more plies are added to provide tensile or compressive strength or connection strength for the hold-downs. The input of the number of end studs at both left and right end has been added to allow the program to select the hold-down capacity and displacement for the Assembly displacement method (see ). The program does not as yet design the built-up studs themselves.
This input has also been added to the Hold-downs data group (see ) in the Opening Input view for the wall studs at the hold-down locations at each side of an opening.
Structure Input
New inputs have been added to the Structure Input form that allow for input of parameters that apply to all hold-downs on a single building level.
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. 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. 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.