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4.4.1 and 5.4.2-Stability of Bending Members
You are responsible for ensuring that the depth to breadth ratios are satisfied whenever a fully restrained condition is assumed or specified in WoodWorks SIZER. Refer to NDS 3.3 for more details.
4.4.2 - Wood Trusses
This provision has not been implemented.
5.4.4 - Tapered bending members
Tapered members have not been implemented in Sizer. It is possible to create a taper to 1/3 the span length via a tapered notch. Only the provisions of 6.4.5 and 3.4.3 regarding notches are applied in this circumstance. Deflections and bending values are not calculated using the net area of the tapered section.
4.4.3, 5.4.5, 8.4.1 - Notches and Taper Cuts
This limitations on notch and taper cut sizes and locations have been implemented in the program for sawn lumber,glulam, and SCL and beams and joists.. Warnings appear upon design if you had entered an invalid notch for a known member size, and the program takes the notch or taper cut size into account when searching for a design for unknown member size.
Compression Edge Notches and Taper Cuts
The following applies to notches on the surface of the member stressed in compression at the support, which is ordinarily the top surface of the member.
For sawn lumber and SCL, the rule that notches and taper cuts cannot extend in the middle third of the span, the span used is the design span, i.e. it is measured from the center of minimum required bearing length from the inner edge of the support.
For glulam, the distance from the end of the member to the end of the notch or taper cut is compared to 1/3 the span length, as per Figure 5F. AWC has informed us that this Figure is in error, and the distance should be measured as it is for sawn lumber and SCL. This will be corrected in the next update of Sizer.
The additional requirements for glulam for notch or taper cut length measured from the end of the member have been implemented. These restrictions are 3 times the residual depth dn for notches and 3 times the member depth d for taper cuts.
The taper cut depth in in determining the allowable amount of remaining material is measured at the inner edge of the support for sawn lumber and SCL, and at the member end for glulam.
Tension Edge Notches
Tension edge notches, ordinarily at the bottom of the member, cannot extend beyond the support. The depth limitations tension edge notches have been implemented. .
Note that bottom notches are allowed on sloped members; these are in effect taper cuts but the "Tapered" input is inactive and unchecked for bottom notches.
Interior-to-span Notches
Notches at locations other than at the supports are permitted by NDS Figure 4A for sawn lumber; however these have not been implemented in Sizer.