This sub-page determines wind load for the Main Wind-Force Resisting System (MWFRS) for buildings of any height as per ASCE 7-10 Chapter 27. Wind loads are determined for the windward wall, leeward wall, side walls and roof.

Assumptions

1. Mean roof heights, h ≤ 500 ft (= 150 meters)
1. Enclosed or partially enclosed building. Calculator is not applicable for open buildings.
2. Gable roof is symmetrical. For flat roofs (θ = 0 degrees) use either Gable (G) or Monoslope (M) for "Roof Type".
3. Sign convention of wind pressures: + is acting toward the surface, - is acting away from the surface
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Building properties

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Building Classification
:II
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Enclosed Building? (Y/N)
:Y
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Roof Type
:Gable
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Ridge Height, hr
:40ft
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Eave Height, he
:25ft
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Building Width, B
:30ft
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Building Length, L
:40ft
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Damping Ratio, β
:0.05
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Suggested range of β = 0.010-0.070

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Period Coeficient, Ct
:0.035
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Wind and site properties

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Wind direction to building ridge
:Normal
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Wind Speed, V
:130mph
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Exposure Category
:B
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Topographic Factor, Kzt
:1
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Directional Factor, Kd
:0.85
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Hurricane Region?
:N
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Building geometry

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Roof Angle, θ
:45.0deg
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Mean Roof Height, h
:32.5ft
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Ratio h/L
:1.08333333333333
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Wind pressure coefficients

External pressure coefficient Cp, walls
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 0.8​ -0.5​ -0.7​
External pressure coefficient Cp, roof
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 Windward Roof Cp =​ 0​ ​ Windward Roof Cp =​ 0​ ​ Leeward Roof Cp =​ -0.6​ ​ ​ ​ ​
Internal pressure coefficient. GCpi
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 0.18​ -0.18​
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Velocity pressure, qh

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Velocity pressure coefficient, Kh
:0.716797796648865
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Velocity pressure, qh (lb/ft^2)
:26.359808893084
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Gust Effect Factor, G

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Frequency, f
:2.09903381443288Hz
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If f>=1, it is a rigid structure
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Simplified Gust Factor, G for rigid structure
:0.85
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Calculated Gust Factor, G for rigid structure
:0.86
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Calculated Gust Factor, G for flexible structure
:N.A.
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Chosen Gust Factor, G
:0.85
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⬆️ Design wind load pressures, p

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Results table below
:Normal to Ridge Wind Load Tabulation for MWFRS - Buildings of Any Height
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 0​ 0.57​ 21.13​ 0.8​ 9.63​ 19.12​ ​ 15​ 0.57​ 21.13​ 0.8​ 9.63​ 19.12​ ​ 20​ 0.62​ 22.95​ 0.8​ 10.86​ 20.35​ ​ 25​ 0.67​ 24.46​ 0.8​ 11.89​ 21.37​ ​ 30​ 0.7​ 25.76​ 0.8​ 12.77​ 22.26​ ​ 35​ 0.73​ 26.92​ 0.8​ 13.56​ 23.05​ For z = hr:​ 40​ 0.76​ 27.97​ 0.8​ 14.28​ 23.77​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 25​ 0.67​ 24.46​ 0.8​ 11.89​ 21.37​ 32.5​ 0.72​ 26.36​ 0.8​ 13.18​ 22.67​ -0.5​ -15.95​ -6.46​ -0.7​ -20.43​ -10.94​ Roof (windward) cond. 1​ 0​ -4.74​ 4.74​ ​ ​ ​ ​ ​ ​ ​ Roof (windward) cond. 2​ -​ -​ -​ 0​ -4.74​ 4.74​ ​ -​ -​ -​ ​ ​ ​ Roof (leeward)​ -​ -​ -​ -0.6​ -18.19​ -8.7​ ​ -​ -​ -​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

How do I apply these results to my building?

The MWFRS of buildings of all heights, shall be designed for the wind load cases described below. The diagrams below are from Figure 27.3-8 of ASCE 7-22, these wind load cases are the same in ASCE 7-10. Note, the diagrams are plan view and roof pressures are not shown for clarity.

Notation

1. Pwx, Pwy = windward face pressure acting in the X, Y principal axis, respectively
2. PLx, PLy = leeward face pressure acting in the X, Y principal axis, respectively
3. ex, ey = eccentricity for X, Y principal axis of the structure, respectively
4. Mz = torsional moment per unit height acting about a vertical axis of the building
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