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In reporting some design values for multi-ply members with a custom section, the program is applying the plies twice, so that values such as section areas, section modulus, S, etc were mistakenly multiplied by a factor equalling the number of plies.
This caused the errors listed below in the design forces, design resistances, or other outputs. Note that these errors were only in the reporting of the design values and design ratios; the program would not issue a warning message based on the erroneous output showing a design failure, nor would it neglect to include a passing member in the list of suggested sections for this reason.
Note too that this occurs only in the case that you type in your own section, such as 2.5 x 5 rather than using a standard section like 2 x 6, and are using a multi-ply material such as Lumber n-ply, which is a somewhat unusual combination of circumstances.
The following problems have been corrected:
Weak Axis Moment Resistance
The value Mry from CSA O86 5.5.4.1 shown in the Analysis column of the Force vs. Resistance table was erroneously multiplied by the number of plies so that the resistance shown was greater than the one that should be used for design by that factor. The design ratio shown used the erroneous value so that a passing design ratio could be shown for a section that actually failed.
Note that due to bug 2859, below, the value that was actually used for design was the correct Mry divided by the number of plies.
Self-weight
The magnitude of the self-weight shown in the load list was greater than the actual load list by the number of plies. This only occurred in the load list shown in the Design Check report, not in the Analysis or Design Summary reports.
Stiffness EI
In the CALCULATIONS section, the weak-axis Deflection Eiy is multiplied by the number of plies squared..
d/b Ratio for Lateral Support
In the calculation of the d/b ratio, the b value is multiplied by the number of plies, so that the d/b ratio shown is less than the actual one. This effects whether the program shows lateral support information in the materials section of the output, and the Design note displayed to show the lateral support required to comply with CSA O86 5.5.4.2.1.