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For structures meeting the requirements of Part 9 of the NBC, many users design using Part 4 but with snow loads specified using Part 9, In this case, the importance factor is 1.0 for serviceability (deflection), but Sizer assumed Part 4 and applies a 0.9 importance factor from O86 Table 4.2.3.2. the program now allows you to specify Part 9 snow loads as follows:
Input
A choice has been added to the Importance category and factor list in Load Input view, called
Normal, Part 9 snow
The factors shown are the same as for the Normal importance category, except that when snow loads are selected SLS – 1.0 replaces SLS = 0.9.
Load Combinations
When load combinations are generated with Normal, Part 9 snow selected, an importance factor of 1.0 is applied for each load type for ultimate limit states, and the serviceability factor is 0.75 for wind and 1.0 for all other types, including snow.
Output
Design Results Output
In the CRITICAL LOAD COMBINATIONS section of the design results output for deflection criteria, the program shows (1.0) before the S symbol instead of (0.9).
Analysis Results Output
A snow factor of 1.0 rather than 0.9 is shown at the head of the serviceability limit states list of load combinations.
Load Table
A note under the loads table indicates that snow loads are from NBC Part 9 and no SLS factor is applied.