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This feature allows for the input of support type and bearing length for columns and particularly wall studs, and allows for the design of the supporting member, which for a wall is the wall bottom plate.
Input
Supported member type
There are there choices for columns – Beam, Non-wood, and Sill plate. There are two possibilities for walls – None and Bottom plate.
The default for columns is Non-wood and for wall studs it is Bottom plate.
Non wood
This is chosen to indicate that the supporting member is made of concrete, steel or some other material not designed by WoodWorks.
Sill Plate
This choice is for a 2-inch thick wooden member which is assumed to lie on the flat, usually affixed to a concrete or block foundation. The program implements a special set of sill plate database materials, using essentially joist database files. The bearing length information is taken from the “d” dimension of the sill plate materials.
Beam
The supported member is assumed to be a beam, so that the material, species, grade, and bearing length information come from our beam database files.
Bottom plate
The supported member is assumed to be a bottom plate of the wall, so that the information comes from the wall database files. It may be different than the wall stud material.
Material, Species, and Grade
These fields operate as described for beams in 1.b)v, except that these fields can be disabled when the user checks the Same Materials as Wall Stud, described below.
Same Materials as Wall Stud
If this item is checked, then the wall bottom plate uses the same Material, Species and Grade as the main member.
These fields are greyed out in this case. The Material shown is the same as the one for the stud, and the Species and Grade, which can be unknown for the main member, read Same as wall stud.
Bearing length
This is a drop list that does not allow the user to enter their own values. For columns, the choices are Column width and Column depth. For walls, there is only one possibility - Stud width.
Bearing Width
There is no bearing width input. For columns, it is assumed to be the other of Column width and Column depth than that which is selected for bearing length. For walls, it is assumed to be the wall stud depth.
Bearing at Support End
The checkbox “Bearing at Support End” indicates that the supporting beam, sill plate, or wall bottom plate ends at the column or wall, so that the bearing length factor CB is not applied.
Refer to the corresponding item for beams for more details ( 1.b)vii ).
Drawing
The column drawing has been rearranged to accommodate the support bearing as follows
Support Symbols
There is not attempt to draw special symbols for columns as we do for beams.
Support Description
A description of column support is added to the column width or depth drawing according to the selection for bearing length. The description is similar to the descriptions for beams described in 1.e)iii.
Member Description
A description of the main member has been added at top centre similar to the one added for beams.
Lateral Support changes
The lateral support description for full and continuous has been moved to the top of the drawing from the bottom, and the Lateral support title is moved down slightly.
Output
Material Specification
A line has been added describing the support.
Analysis vs Allowable Stress
A line for Support Bearing has been added, giving the allowable and actual fcp/Fcp values for the support.
Additional Data Factor Table
A line has been added giving the factors that are applicable to the support, similar to other design criteria
Additional Data Support Line
A line has been added giving
Warning
If the member fails due to insufficient support capacity, the design criterion “support bearing” is added to the failure message note.