Combination of Roof and Floor Live Loads
Combination of Roof and Floor Live Loads
(OP)
Hi all,
Say I have a floor beam that is supporting two different roofs as well the floor. When I come to load combinations, is Q (live load) simply the two roof live loads combined with the floor live load or is that not right?
Thanks in advance.
Say I have a floor beam that is supporting two different roofs as well the floor. When I come to load combinations, is Q (live load) simply the two roof live loads combined with the floor live load or is that not right?
Thanks in advance.






RE: Combination of Roof and Floor Live Loads
"It is imperative Cunth doesn't get his hands on those codes."
RE: Combination of Roof and Floor Live Loads
Check your load combinations: 2,3 and 4 (ASD).
Also if your roof and floor tributary areas are quite large check for live load reductions for both roof and floor loads.
A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com
RE: Combination of Roof and Floor Live Loads
BA
RE: Combination of Roof and Floor Live Loads
I am using AS/NZ 1170. Which is the Australian/NZ code. This is for limit state design.
Load combinations for ULS (ultimate limit state) are:
1.2G + 1.5Q
1.2G + Su + zero x Q
G + 0.7Q
G+ 0.5Su
RE: Combination of Roof and Floor Live Loads
RE: Combination of Roof and Floor Live Loads
Mike McCann, PE, SE (WA)
RE: Combination of Roof and Floor Live Loads
He is asking about the Australian code, which does not permit live load reduction for a roof.
RE: Combination of Roof and Floor Live Loads
Mike McCann, PE, SE (WA)