jabacus - Specified Wind Load - Static Procedure - CL 4.1.7.3

Specified Wind Load

CL 4.1.7.3 (NBC 2020)

v1.0.1

Climatic Data

Location

Province:

Reference Velocity Pressure

Factors

Importance factor

I_w:

Limit state:

Building dimensions

Building height, H:

Building width parallel to wind direction,

Midheight of dominant opening (for C_ei)

Midheight, h_i:

m (leave empty if no dominant opening.)

Input Parameters

Exposure Factor

Terrain:

Exterior gust factor,

C_g:

(to be 2.0 for the building as a whole and main structural members)

Interior gust factor,

C_gi:

Topographic factor,

C_t:

Internal pressure Category, C_pi:

Specific design elevation above grade,

Number of design steps,

Factors

User input values:
q: 1kPa
Importance Factor, ULS: I_w = 1.0
(Note: No load factors are applied to the results below.)
C_t = 1

External Wind Pressures

p = I_w*q*C_e*C_t*C_g*C_p

Windward Face

H/D = 1
Ce = Ce(Z)
Cp = 0.8

On Leeward Face

C_e(H/2) = C_e = (h/10)^0.2 (but not less than 0.9) = 0.9
Cp = -0.5
p = I_w*q*C_e(H)*C_t*C_g*C_p = -0.9 kPa

Z (m)	C_e(Z)	p (windward) (kPa)	p (leeward) (kPa)	p (combined) (kPa)
roof:1	0.9	1.44	-0.9	2.34
0.75	0.9	1.44	-0.9	2.34
0.5	0.9	1.44	-0.9	2.34
0.25	0.9	1.44	-0.9	2.34
grade: 0	0.9	1.44	-0.9	2.34
specified: 0	0.9	1.44	-0.9	2.34

On Roof

C_e(H) = C_e = (h/10)^0.2 (but not less than 0.9) = 0.9
Cp = -1
p = I_w*q*C_e(H)*C_t*C_g*C_p = -1.8 kPa

On Side Walls

C_e(H) = C_e = (h/10)^0.2 (but not less than 0.9) = 0.9
Cp = -0.7
p = I_w*q*C_e(H)*C_t*C_g*C_p = -1.26 kPa

Internal Wind Pressure

C_gi = 2.0

C_pi = 0.3 to -0.45

Reference height (max H/2 or 6m)= 6 m
C_ei = (h_i/10)^0.2 (but not less than 0.9) = 0.9

p_i = I_w*q*C_ei*C_t*C_gi*C_pi
p_i = 0.54kPa to -0.81kPa

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.