More Windy Componets & Cladding
More Windy Componets & Cladding
(OP)
Wind loading on a large garage door (horizontal slider).
Given the following parameters:
V = 90 mph
I = 1.0
Kd = .85
Kz = .98
Kzt = 1.44
ASCE 7-02 Section 6.5.10:
qz = (.00256)*Kz*Kzt*Kd*V^2*I
= (.00256)(.98)(1.44)(.85)(90^2)(1.0)
= 24.87 psf
Now for the C & C design wind pressure for a low rise building (< 60') see
ASCE 7-02 Section 6.5.12.4:
p = qh[GCp-GCpi] where
GCpi = .55
GCp = 0.90
= -1.00
then p = 24.87*[0.90 -.55] = 8.71 psf
or
p = 24.87*[-1.0 – (-0.55)] = -11.19 psf
This just doesn't see right to me for the wind load on a large garage door. The magnitude of the difference between positive and negative pressure seems about right, but I'm thinking the values should be about double what I get; what do you fellow designers think? Where am I going wrong?
Given the following parameters:
V = 90 mph
I = 1.0
Kd = .85
Kz = .98
Kzt = 1.44
ASCE 7-02 Section 6.5.10:
qz = (.00256)*Kz*Kzt*Kd*V^2*I
= (.00256)(.98)(1.44)(.85)(90^2)(1.0)
= 24.87 psf
Now for the C & C design wind pressure for a low rise building (< 60') see
ASCE 7-02 Section 6.5.12.4:
p = qh[GCp-GCpi] where
GCpi = .55
GCp = 0.90
= -1.00
then p = 24.87*[0.90 -.55] = 8.71 psf
or
p = 24.87*[-1.0 – (-0.55)] = -11.19 psf
This just doesn't see right to me for the wind load on a large garage door. The magnitude of the difference between positive and negative pressure seems about right, but I'm thinking the values should be about double what I get; what do you fellow designers think? Where am I going wrong?






RE: More Windy Componets & Cladding
DaveAtkins
RE: More Windy Componets & Cladding
p = 24.87*[0.90 -(-.55] = 36.06 psf
or
p = 24.87*[-1.0 – (0.55)] = -38.54 psf
I fill better, although that's a pretty hefty wind load. It is about 18 psf more than in Table 1609.6.2.1(2) for Walls in Zone 4. Any thoughts on that?
Thanks Dave!
RE: More Windy Componets & Cladding
RE: More Windy Componets & Cladding