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Attachment 2: Wind Loading Calculation
IBC Wind Load Calculations
Project: CVG Railings - North Carolina High Wind Region
Project #: 05-20608
11/5/2020
Code: North Carolina Building Code
Source Document: ASCE 7-10, Chapter 29
Other Structures (Section 6.5.13)
Coefficients
Coefficient value source
Risk Category
ii Table 1.5-1
V (mph): 139 Figures 26.5-1A-C. All of US except Special Wind Regions
Exposure: c para 26.7
direction factor, Kd: 0.85 Table 26.6-1
topography fact , Kzt 1 para 26.8
gust factor, G 0.85 Section 26.9
Larger dimension of sign, M (ft) 5 Table 6-11
Smaller dimension of sign, N (ft) 3 Table 6-11
Net force coefficients, Cf 1.8 Figure 29.4-1 through 29.5-3
Average height above ground, (ft) 100
velocity pres. Expose coeff, Kz Table 29.3-1
Building height (ft):
0-15
0.85
20
0.9
25
0.94
30
0.98
40
1.04
50
1.09
60
1.13
70
1.17
80
1.21
90
1.24
100
1.26 Kh (K @ mean roof ht
velocity pres. Expose coeff, Kh 1.26 Choose highest value of Kz
Velocity pressure, qz 52.97 qz=.00256*Kz*Kzt*Kd*V^2
Projected area normal to wind, Af (sq ft) 15 =M*N
Total Force on Supports, F (kips) 1.22 F=qz*G*Cf*Af
Equivalent pressure, P (psf) 81.0 P=F/(M*N)