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The program now allows you to specify the faces of a member that are exposed to fire. Previously, for you could only select from 0, 3 or 4 sides exposed, and the program would assume 3 sides was 2 side faces and top or bottom.
The Fire Design data group has checkboxes surrounding a section of the member allowing you to specify which of the 4 faces are exposed.
For timber or glulam designed using CSA O86 Annex B, any or all of the sides can be selected.
For CLT floor and roof panels, you can select the bottom, only. For wall panels you can select left or right, but not both.
Fire design is deactivated by deselecting all checkboxes, which is the default condition.
Previously, when an invalid material like built-up lumber members or SCL was selected, the program would allow input of number of exposed sides then revert to 0 when the design button was pressed. Now it disables the input of exposed sides when one of these materials is selected.
The program reduces the design section by calculating a char depth for each exposed face.
The choice of left or right beam surfaces does not affect design, or column surfaces perpendicular to applied loading.
For column surfaces parallel to the applied force and CLT wall panels, the choice of left or right surface can have design consequences due to axial load eccentricity.
Input fire protection is assumed to apply to each exposed face.
The choice of exposed faces is shown in the materials specification of the Design Check output as follows, as the case may be:
Exposed to fire on [ one [b,d]-face, opposing [b,d]-faces, both [b,d]-faces and one [b,d]-face, all four faces ]
The program was applying several modification factors for non-fire design to fire design, even though they should not be applicable to fire design according to NDS Table 16.2.2. The factors for repetitive member Cr, wet service CM, incising Ci and temperature Ct were showing a dash in the Factors table in Design Check output, but the factors were being calculated applied to fire design bending and shear criteria. They no longer are.
For column supporting members, the wet service factor CM for bearing design for sawn lumber used by Sizer was 0.67 for Fc perp from NDS Table 4D, when it should have been 0.91 for Fc parallel. This has been corrected.
Starting with version 11.1, a point of interest was added to a wall stud or column in Column Mode, the program crashed when member design was invoked. It did not happen for beams. This has been corrected.
For design sections having analysis values, e.g. Mf , that are greater than design resistance values e.g. Mr, by an amount that is less than ½ of 1% of the value, the Analysis vs. Design table in the Design Check showed a 1.00 design ratio (when in decimal format) and showed a passing section note instead of failure warning.
Now, the program considers a design to be failed if the ratio is greater than 1.0005, and outputs the ratio with an extra digit of precision, e.g. 1.003. For example, a member with Mf = 20295 lb-ft and Mr with 20205 would show a ratio of 1.00 and pass, but now it shows 1.004 and fails.
When percentage is chosen as the design ratio output in the Preference settings, a greater tolerance in determining design failure is possible. In this case, the program currently considers a design to be failed if the percentage is greater than 100.05% (1.0005). Now the program considers design to be failed with a ratio greater than 1.00005, and outputs the percentage with a digit of precision, e.g. 100.03%. For example, a member with Mf = 20215 lb-ft and Mr = 20205 will show a ratio of 1.00 and pass when decimal is chosen, but when percentage is chosen, it shows 100.04% and fails.
When a new span is added to create a multi-span beam, the Laterally supported at support checkbox for interior supports is now unchecked by default. Previously it was checked, but in most common situations lateral supports are not provided to interior supports.
The fire design procedure for beams and columns from IBC 2012 722.6.3 has been removed from Sizer, as it is no longer in the IBC as of 2015. The option in beam and column views to select from this procedure and NBC Chapter 16 has been removed, and the NDS procedure is used exclusively.
In Beam mode, Design Summary for unknown design, for all sections except the first one listed, the program was showing a shear design ratio for a load combination other than the critical one used to select the section.
This was a display issue only and did not affect the determination of the section to be shown. If that section was then selected for a design check, the design ratio in the Design Check output was correct.
For glulam beams, in Beam mode, the Repetitive member check box is now disabled, as per to NDS Table 5.3.1 and 16.2.2 for fire design. Previously if you checked the box, it would automatically uncheck if a design was run. The factor is now output as a dash rather than a 1.0 in the Factors table of the Design Check output.