ASCE7-10 Parapet Wind Load

[dcarr82775]

Wanted to see if people get the same value I do for parapet wind loading using ASCE7-10.

Assume: velocity pressure, qz=29 psf.
trib area = 20 ft^2

For Windward Parapet with flat roof:
Positive Pressure : Figure 30.4-1 GCp=+.095
Negative Pressure : Figure 30.4-2A GCp=-1.6 (Zone 2)

Therefore, pressure = 74 psf ultimate, or 44psf service.

Thanks

 

[DST148]

I don't have ASCE 7-10. Things may have changed significantly, but some general comments:
a)The previous versions refer to different figures based on the height of the building - h < 60 feet and h > 60 feet
b) Effective width in calculating effective area for C & C need not be taken less than 1/3 of the span. Text Book - Loads and Load Paths in Buildings by Dr. Narendra Taly calculates effective area for vertically spanning walls based on spacing of the vertical reinforcement.
c) The previous versions distinguish pressures on walls based on locations i.e. corner (zone 5) or interior(zone 4).

 

[puy]

Also remember that for C&C:

Chapter 26 - WIND LOADS: GENERAL REQUIREMENTS​

For cladding fasteners, the effective wind area​

shall not be greater than the area that is tributary to an​

individual fastener.​

FT