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Sizer designs for bearing of both the supported column and wall stud, and the member supporting the wall stud. It is also possible to specify that the support is a hanger or other non-wood support that does not need to be designed, in which case only the main member bearing is checked.
Support Types
The possible support types are
Non-wood
This is chosen to indicate that the supporting member is made of concrete, steel or some other material not designed by WoodWorks. If this is chosen, supporting member design is not part of the bearing design routine, and the Material, Species and Grade inputs are unknown..
This option is available for supported columns, and a similar option, None, applies to walls.
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 Kzcp value used for the supporting member is one that assumes a 2" thick member; typically the value is 1.15.
This option is available for supported columns or CLT wall panels.
Beam
The supporting member is assumed to be a beam, so that the material, species and grade information come from our beam database files.
This option is available for supported columns only.
Bottom plate
The supported member is assumed to be a bottom plate of a wall, so that material, species and grade information comes from the wall database files.
This option is available for supported wall studs only.
Floor Panel
The supported member is assumed to be a floor panel, so that material, species and grade information comes from the CLTdatabase files.
This option is available for supported wall panels only.
Inputs
Bearing Length
It is not possible to enter a value for bearing length; your choices are fixed by the dimensions of the supported member as follows:
Columns
For columns, you can choose either the column width or depth as the bearing length, according to the way the column is oriented on the supporting member. You would choose depth if the "d" dimension of the column ran along a sill plate or beam.
Wall Studs
For wall studs, it is assumed to be the stud thickness bearing on the bottom wall plate.
Wall Panels
For CLT floor panels, you choose between the wall panel depth and the one-foot or one-meter design width.
Bearing Width
There is no bearing width input, the bearing width is assumed to be the other section dimension than the one used as the length; so for columns and wall panels, if b is chosen as the length, d is the width. For wall studs, the depth d is always the bearing width.
Lower Support
For columns supported by beams, you can specify the length of the support such as a column or another beam under the supporting beam. This is to
You can choose that there is no such support at the location under the column, that the support length is the same as the column width, or that there is continuous support for the beam, or enter a numerical value.
Bearing at Support Ends
The checkbox “Bearing where support ends or is highly stressed” indicates that the supporting member ends at the supported member, so that the bearing length factor KB is not applied, or that it is an area of high bending stress, to take into account O86 6.5.7.6 (b), which says that KB is not to be applied in that circumstance. An example of this situation would be the end purlin when a beam supports a series of purlins.
For walls, you would check this for the end stud of a wall.