Load case vs combination?
Load case vs combination?
(OP)
What is the difference between load cases and combinations? When doing calcs by hand I only use load combinations (1.2DL + 1.6LL, etc.) At my firm when using software we enter both but the load cases are the load combinations multiplied by 1.






RE: Load case vs combination?
So, for example you might have the following load combination for multiple live load cases:
1.2DL + 1.6LL(case 1)
1.2DL + 1.6LL(case 2)
1.2DL + 1.6LL(case 3)
etc.
Professional and Structural Engineer (ME, NH, MA)
American Concrete Industries
www.americanconcrete.com
RE: Load case vs combination?
Load combinations are how the load cases are combined.
RE: Load case vs combination?
What load cases are defined?
What load combinations defined?
If you're inputting load combinations with a 1.0 load factor(1.0*Dead +1.0*Live), it may be for bearing pressures under foundations. Essentially inputting both ASD load combinations and LRFD load combinations.
I believe this doesn't make a huge difference until you get into non linear effects. For small, squat, simple buildings with low lateral forces, it may just be terminology.