New Simplified Wind Analysis

[DTS419]

Does anyone know how to develop a roof uplift using the new simplified procedure (method 1) of ASCE7-05?

 

[COEngineeer]

It is listed on figure 6-2. Add up E to H.

Never, but never question engineer's judgement

 

[DTS419]

The part that doesn't make snese is 6.4.2.1.1 "...while assuming zones E, F, G, and H are all equal to 0 psf." Why would you assume them equal to 0 psf?

 

[COEngineeer]

After you plug in 6.4.2.1 and the results of ABCD are less than 10 psf, just use 10 psf and say EFGH =0. I never really affect me because i am never at this situation. Hopefully I understand it correctly.

Never, but never question engineer's judgement

 

[DTS419]

so if ABCD are less than 10 psf, you design the walls for 10 psf and assume 0 for the roof uplift, EFGH?

 

[COEngineeer]

Thats how I understand it. But there is still component and cladding pressure (to figure out the nailing of the roof plywood to rafters if this is a timber building)

Never, but never question engineer's judgement

 

[DTS419]

So what's the different between desiging the roof for regular uplift, and designing it as components & cladding?