ASCE 7-05 wind load case 1

[burtonSTR]

Figure 6-9 (page 52) shown 4 wind load case, but it seems most design only used case 1 in load combination. When we need to use all 4 case?

Thank you

 

[JAE]

All 4 cases are required all the time.

But you can use your judgement as to which actually has the most effect on the element you are designing.

 

[Lion06]

Yes, you have to use them all, all the time. This is part of the reason for the absurd number of load combinations that are generated. The last time I did a combination generation in RAM, it was over 300. 300!!!

 

[slickdeals]

300? Were you using Wind and Seismic and Snow and Flood?

I typically end up with around 70-80 with Wind loads.

 

[Lion06]

No flood, just wind, seismic, dead, live, and snow.

 

[WillisV]

If you are doing direct analysis on a building that requires the notional loads to be used in combination with the lateral loads (i.e. has a stability amplifier > 1.5) you can end up with a lot more - playing around with Ram's combo generator results in...get this...1252 combos!!!!

 

[burtonSTR]

Thank you.

The codes become more and more complex.

"1252 combos"!!!

 

[zeemas]

1252 Combos............%-)