Hey all,
Got a quick question to my fellow Canadian practitioners regarding the 2020 SLS load combinations. I just wanted to make sure that for combinations where snow and wind get reduced to 0.35 and 0.3 as companion loads, you still apply the additional SLS importance factors on top of this. It just seems really odd for me to go from 2010 code which had no SLS combinations, to 2020 code where wind as a companion load is taken as 0.75*0.3 = 0.225, or 22.5% of the applied wind load for serviceability cases.
Again, I'm 99% postive that you do, just the NBCC document doesn't have a generalized equation in their load combination section whereby α*I*L<=R for serviceability that indicates to use the importance factor; the only thing I can find in the commentary is paragraph 7 of Commentary A where it says "serviceability limit >= effect of service loads". Paragraph 5 actually lays out the factors symbolically for ULS.
Got a quick question to my fellow Canadian practitioners regarding the 2020 SLS load combinations. I just wanted to make sure that for combinations where snow and wind get reduced to 0.35 and 0.3 as companion loads, you still apply the additional SLS importance factors on top of this. It just seems really odd for me to go from 2010 code which had no SLS combinations, to 2020 code where wind as a companion load is taken as 0.75*0.3 = 0.225, or 22.5% of the applied wind load for serviceability cases.
Again, I'm 99% postive that you do, just the NBCC document doesn't have a generalized equation in their load combination section whereby α*I*L<=R for serviceability that indicates to use the importance factor; the only thing I can find in the commentary is paragraph 7 of Commentary A where it says "serviceability limit >= effect of service loads". Paragraph 5 actually lays out the factors symbolically for ULS.
