Wind Loads in ASCE 7-16

[azcats]

Just looking for a little sanity check here.

I had designed a Risk Category II structure in the CA desert up the hill north of San Bernardino. Was 110 mph under ASCE 7-10. Re-did it for the new code as it will be permitted next year. Wind speed reduced to 96 mph and the elevation factor is applicable.

My wind loads have reduced over 30%. (96^2)/(110^2) is 0.76 without even applying the elevation factor. Seem reasonable? Am I missing something?

I'm pretty sure this is to be expected, but that was a more significant decrease than I was imagining.

 

[P1ENG]

azcats,

You will notice a large MWF lateral force reduction with the new standard. It can't all be good news though... You will notice that C&C roof uplift forces will usually increase; even with the lower wind speeds.

Juston Fluckey, SE, PE, AWS CWI
Engineering Consultant