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Specified Wind Load

Figure 4.1.7.6.-A (NBC2020)
v1.0.1
File:
Project:
Designer:
Date:

Climatic Data

Source
Region
Location
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Velocity Pressure
Return Period:
Reference Velocity Pressure
q:
kPa

Factors

Importance factor
Iw:
Exposure Factor
Terrain:
Exterior reference height, h:
m (meters above grade for Ce)
Interior reference height, hi:
m (meters above grade for Cei)
Topographic Factor
Ct:
Internal pressure
Category, Cpi:
info
Building Openings: [CL: 4.1.7.1]
Category 1: Uniformly distributed small openings amounting to less than 0.1% of the total surface area of the building.

Category 2: Non-uniformly distributed openings of which none is significant or significant openings that are wind-resistant and closed during storms.

Category 3: Large openings likely to remain open during storms.

For cladding on parapets use Category 3.

Building Geometry

Roof Pitch:
/12
End-zone widths
Eave height, H:
m
Least horizontal dim., L:
m
info
End-zone width z is the length along the gable and is the lesser of 10% of the least horizontal dimension or 40% of the eave height, H, but not less than 4% of the least horizontal dimension or 1m
End-zone width y is along the side wall and should be the greater of 6m or 2z
If either length is blank end-zone widths will not be computed
wind load figure
Thinking...

Factors

Location: 100 Mile House, British Columbia
q50: 0.39kPa
Importance Factor, ULS: Iw = 1.0 / SLS: Iw = 0.75
Roof slope = 0 degrees
Ce = (h/10)0.2 = 0.9

External Wind Pressure

p = Iw*q*Ce*Cg*Cp
Load Case A: Winds generally perpendicular to ridge
Load Case B: Winds generally parallel to ridge
Side
1
1E
2
2E
3
3E
4
4E
5
5E
6
6E
Load Case A
CpCg
0.75
1.15
-1.3
-2
-0.7
-1
-0.55
-0.8
n/a
n/a
n/a
n/a
ULS
p
(kPa)
0.26
0.4
-0.46
-0.7
-0.25
-0.35
-0.19
-0.28
n/a
n/a
n/a
n/a
SLS
p
(kPa)
0.2
0.3
-0.34
-0.53
-0.18
-0.26
-0.14
-0.21
n/a
n/a
n/a
n/a
Load Case B
CpCg
-0.85
-0.9
-1.3
-2.0
-0.7
-1.0
-0.85
-0.9
0.75
1.15
-0.55
-0.8
ULS
p
(kPa)
-0.3
-0.32
-0.46
-0.7
-0.25
-0.35
-0.3
-0.32
0.26
0.4
-0.19
-0.28
SLS
p
(kPa)
-0.22
-0.24
-0.34
-0.53
-0.18
-0.26
-0.22
-0.24
0.2
0.3
-0.14
-0.21

Internal Wind Pressure

Cgi = 2
Cpi = -0.15 to 0
pi = Iw*q*Ce*Cgi*Cpi
ULS: pi = -0.11kPa to 0kPa
SLS: pi = -0.08kPa to 0kPa

This information must be read or used in conjunction with Part 4 of the NBC 2020. In the event of discrepancies, Part 4 of the NBC 2020 shall govern.

© 2009–2025 Modulo Software Inc.
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