ASCE 7-05 Open Buildings - Case A vs. B?

[CFNick]

This is probably a dumb question, but what is the difference between Case A and Case B for Open Building MWFRS calculations. 7-05 Figure 6-18 indicates the load cases but I cannot find an explanation. Any help is appreciated.

Thanks,
Nick

 

[slickdeals]

One of the cases maximizes uplift while the other maximizes downforce.

 

[RHTPE]

Wondered that myself, as there is no explanation in ASCE 7's code or commentary. I agree with slickdeals that Cases A & B represent the extremes between uplift and down force.


Ralph
Structures Consulting
Northeast USA

 

[iv63]

Cases A & B represent max. variation in loading due to gusts at different times.
IV