Wind Load (Any Height)

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.
AssumptionsMean roof heights, h ≤ 500 ft (= 150 meters)
Enclosed or partially enclosed building. Calculator is not applicable for open buildings.
Gable roof is symmetrical. For flat roofs (θ = 0 degrees) use either Gable (G) or Monoslope (M) for "Roof Type".
Sign convention of wind pressures: + is acting toward the surface, - is acting away from the surface
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Main Wind-Force Resisting System (MWFRS) for buildings of any height
CalculationInputsBuilding properties
﻿﻿Building Classification
:II​
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﻿﻿Enclosed Building? (Y/N)
:Y​
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﻿﻿Roof Type
:Gable​
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﻿﻿hr
:40ft​
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﻿﻿he
:25ft​
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﻿﻿B
:30ft​
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﻿﻿L
:40ft​
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﻿﻿β
:0.05​
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Suggested range of β = 0.010-0.070
﻿﻿Period Coeficient, Ct
:0.035​
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Suggested range of Ct = 0.020-0.035
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Wind and site properties
﻿﻿Wind direction to building ridge
:Normal​
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﻿﻿V
:130mph​
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﻿﻿Exposure Category
:B​
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﻿﻿Kzt
:1​
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﻿﻿Kd
:0.85​
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﻿﻿Hurricane Region?
:N​
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OutputBuilding geometry
﻿﻿θ
:45.0deg​
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﻿﻿h
:32.5ft​
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﻿﻿Ratio h/L
:1.0833333333333333​
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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​
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Windward Roof Cp ​
0​
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Leeward Roof Cp ​
-0.6​
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Internal pressure coefficient. GCpi
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0.18​
-0.18​
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Velocity pressure, qh
﻿﻿Kh
:0.7167977966488652​
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﻿﻿qh, lb/ft^2
:26.359808893084033​
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Gust Effect Factor, G
﻿﻿f
:2.0990338144328793Hz​
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If f>=1, it is a rigid structure
﻿﻿G for rigid structure
:1​
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﻿﻿G for rigid structure (1)
:0.86​
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﻿﻿G for flexible structure
:N.A.​
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﻿﻿G
:0.85​
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Design wind load pressures, p﻿﻿Results table below
:Normal to Ridge Wind Load Tabulation for MWFRS - Buildings of Any Height​
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Details
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0​
0.57​
21.13​
0.8​
9.63​
19.12​
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15​
0.57​
21.13​
0.8​
9.63​
19.12​
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20​
0.62​
22.95​
0.8​
10.86​
20.35​
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25​
0.67​
24.46​
0.8​
11.89​
21.37​
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30​
0.7​
25.76​
0.8​
12.77​
22.26​
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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​
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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​
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Roof (windward) cond. 2​
-​
-​
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0​
-4.74​
4.74​
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-​
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Roof (leeward)​
-​
-​
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-0.6​
-18.19​
-8.7​
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ExplanationHow 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
Pwx, Pwy = windward face pressure acting in the X, Y principal axis, respectively
PLx, PLy = leeward face pressure acting in the X, Y principal axis, respectively
ex, ey = eccentricity for X, Y principal axis of the structure, respectively
Mz = torsional moment per unit height acting about a vertical axis of the building
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Case 1: full design wind pressure acting on the projected area perpendicular to each principle axis of the structure, considered separately along each principal axis.
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Case 3: Wind pressure as defined in Case 1, but considered to act simultaneously at 75% of the specified value.
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Case 2: Three quarters of the design wind pressure acting on the projected area perpendicular to each principal axis of the structure in conjunction with a torsional moment as shown, considered separately for each principal axis. 
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Case 4: Wind pressure as defined in Case 2 but considered to act simultaneously at 75% of the specified value.
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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
	-	-	-
	0.18
	-0.18