open structure wind design

huangyhg

open structure wind design
what are load cases a & b in figure 6-18a-d in asce 7-05?  
check out our whitepaper library.
they are simply two different load cases that must be included in your load combinations for w.  
a is typically the wind condition where the windward slope has positive pressure and b is the case where all surfaces experience negative, suction, pressures.