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Sizer designs for bearing of both the supported beam, joist or panel and the supporting members at all supports. 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:
Hanger
Hanger Indicates a steel hanger of unknown type is used for the member. If this is chosen, supporting member design is not be part of the bearing design routine, and the Material, Species and Grade inputs are unknown. It does, however, have a list of bearing sizes representing common hanger lengths.
Other 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 are not part of the bearing design routine, and the Material, Species and Grade inputs are disabled and blanked out. This option does not have a list of bearing lengths associated with it, and designs for minimum or rounded minimum instead.
Simpson Hanger
It is possible to choose a hanger from the set of joist or beam hangers in the Simpson Strong-tie catalogue that correspond to the type and size of the main member being designed and a supporting member that the hanger is attached to, which you also specify,
You can also select this option but leave the specific hanger unknown, and the program will find the most cost-effective option.
This option is available for supported beams and joists.
Refer to Simpson Hangers for more information.
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 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.
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 beams, joists, and CLT panels.
Beam
The supported member is assumed to be a beam, so that the material, species, grade, and bearing length information comes from our beam database files. The bearing length info is taken from the “b” dimension of the beam.
The Kzcp value used for the supporting member is one that assumes a member deeper than it is wide, so Kzcp is one.
This option is available for supported beams, josts, and CLT panels.
Column
The supported member is assumed to be a column, so that the material, species, grade, and bearing length information comes from our column database files. The bearing design choices are taken from all of those from the “b” or “d” dimension of the column could be oriented either way.
This option is available only for supported beams.
Wall
The supported member is assumed to be a stud wall, so that the material, species, grade, and bearing length information comes from our wall database files. The bearing length information is taken from the “d” dimension of the wall plate.
The Kzcp value used for the supporting member is one that assumes a 2" thick member, typically 1.15.
This option is available for supported joists, beams and floor and roof panels
Wall Panel
The supported member is assumed to be a CLT wall panel, so that the material, species, grade, and bearing length information comes from our wall panel database files. The bearing length information is taken from the “d” dimension of the wall panel.
This option is available for supported joists, beams and floor and roof panels
Inputs
Bearing Length
It is possible to specify that the bearing length is unknown, in which case Sizer will determine the bearing length. In doing so, you can choose to specify that the length be
Bearing Width
It is possible to enter a bearing width that is less than the width of the supported beam to model the situation where bearing is mediated by a plate or some other mechanical device, or if the supporting member is narrower than the supported member, as in a 10" beam supported by an 8" column.
Point Load Bearing Length and Width
Here you enter a bearing length and width for a member that may exist above the support transferring a point load to a beam that is used in the equation in 6.5.6.3 for the effect of bearing on loads near the support. The default value is the same as the support bearing length, you can also choose greater than twice the bearing length (for which the resistance remains the same), and 1/2 the bearing length, or enter your own value.
Clause 6.5.6.3 is only invoked if point loads exist within a distance d of the support.
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.
Minimum Bearing Length Setting
This Design Setting allows you to specify smallest bearing the program is able to design for, for interior and end supports separately. If the program calculates a minimum bearing less than this value, it overrides it with the value entered.