serviceability using the canadian code

huangyhg

serviceability using the canadian code
usually i calculate the deflection of a beam using live load only or dead and live load and compare it with a limit that is a function of the length of the beam over some number (typically l/360 and l/240.) or if i'm checking the deflection of a column, i only consider wind load when comparing it to the drift limit.
however, looking at an old design brief, i observed several load combinations used for serviceability and i am not sure where these combinations are coming from:
1.0d + 1.0l + 0.5s
1.0d + 1.0s + 0.5l
(the above combs are taking into consideration both snow and live)
and several other load combinations that i will post tomorrow when i am at work
and for wind:
1.0d + 1.0w
(the above is taking into consideration dead load when checking lateral drift)
this could be very trivial, but i best verify and understand this instead of doing something wrong for a very long time.
thanks