Wind Load (Open Building)

This sub-page determines wind load of open buildings of any height as per ASCE 7-10 Chapter 30 Part 3. Wind loads are determined for the 
AssumptionsStructure height, h ≤ 500 ft (= 150 meters)
Applicable for open buildings WITHOUT a roof. Open building defined as a building that has each wall at least 80% open
Sign convention of wind pressures: + is acting toward the surface, - is acting away from the surface
﻿
﻿
Open buildings of any height
CalculationInputsBuilding properties
﻿﻿Building Classification
:II​
﻿
﻿﻿Height of structure
:125.0ft​
﻿
﻿﻿B
:150.0ft​
﻿
﻿﻿ L
:100​
﻿
﻿﻿ β
:0.01​
﻿
Suggested range of β = 0.010-0.070
The Damping Ratio, β is the percent of critical damping. 
It is only used in the calculation of the Gust Factor, Gf, when a structure is considered "flexible".  A structure is considered "flexible" when it has a natural frequency, f < 1 hz. Otherwise the structure is considered "rigid".
Suggested range of values is from 0.010 to 0.070.
Note:  if the structure is "flexible", the smaller the value of the damping ratio, the larger the gust effect factor, Gf, becomes.
﻿﻿ Ct =
:0.02​
﻿
Suggested range = 0.020-0.035
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Wind and site properties
﻿﻿Exposure category
:C​
﻿
﻿﻿ V
:170mph​
﻿
﻿﻿Kzt
:1​
﻿
﻿﻿Kd
:0.85​
﻿
﻿﻿Hurricane Region?
:N​
﻿
﻿
OutputGust Effect Factor, G
﻿﻿f
:1.33748060995284Hz​
﻿
If f>=1, it is a rigid structure
﻿﻿G for rigid structure
:0.85​
﻿
﻿﻿ G for rigid structure
:0.854529822164449​
﻿
﻿﻿ G for flexible structure
:N.A.​
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﻿
﻿﻿ G
:0.85​
﻿
﻿
ExplanationDesign wind load pressures, pNet design wind pressures, p for open structures for varying values of the Force Coefficient, Cf = 1.2, 1.6, 1.8 and 2.0.
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0​
0.85​
53.38​
45.38​
54.45​
72.6​
81.68​
90.75​
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15​
0.85​
53.38​
45.38​
54.45​
72.6​
81.68​
90.75​
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20​
0.9​
56.72​
48.21​
57.85​
77.13​
86.78​
96.42​
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25​
0.95​
59.44​
50.53​
60.63​
80.84​
90.95​
101.06​
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30​
0.98​
61.77​
52.5​
63.01​
84.01​
94.51​
105.01​
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35​
1.01​
63.81​
54.24​
65.08​
86.78​
97.63​
108.47​
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40​
1.04​
65.63​
55.78​
66.94​
89.25​
100.41​
111.57​
​
45​
1.07​
67.27​
57.18​
68.62​
91.49​
102.93​
114.37​
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50​
1.09​
68.78​
58.47​
70.16​
93.55​
105.24​
116.93​
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55​
1.12​
70.18​
59.65​
71.58​
95.44​
107.37​
119.3​
​
60​
1.14​
71.48​
60.75​
72.9​
97.21​
109.36​
121.51​
​
70​
1.17​
73.83​
62.76​
75.31​
100.41​
112.96​
125.52​
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80​
1.21​
75.94​
64.55​
77.46​
103.28​
116.18​
129.09​
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90​
1.24​
77.84​
66.17​
79.4​
105.87​
119.1​
132.34​
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100​
1.27​
79.59​
67.65​
81.18​
108.24​
121.77​
135.3​
​
120​
1.32​
82.7​
70.3​
84.36​
112.48​
126.54​
140.6​
For z = h:​
125​
1.33​
83.42​
70.91​
85.09​
113.45​
127.63​
141.81​
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	0	0.85	53.38	45.38	54.45	72.6	81.68	90.75
	15	0.85	53.38	45.38	54.45	72.6	81.68	90.75
	20	0.9	56.72	48.21	57.85	77.13	86.78	96.42
	25	0.95	59.44	50.53	60.63	80.84	90.95	101.06
	30	0.98	61.77	52.5	63.01	84.01	94.51	105.01
	35	1.01	63.81	54.24	65.08	86.78	97.63	108.47
	40	1.04	65.63	55.78	66.94	89.25	100.41	111.57
	45	1.07	67.27	57.18	68.62	91.49	102.93	114.37
	50	1.09	68.78	58.47	70.16	93.55	105.24	116.93
	55	1.12	70.18	59.65	71.58	95.44	107.37	119.3
	60	1.14	71.48	60.75	72.9	97.21	109.36	121.51
	70	1.17	73.83	62.76	75.31	100.41	112.96	125.52
	80	1.21	75.94	64.55	77.46	103.28	116.18	129.09
	90	1.24	77.84	66.17	79.4	105.87	119.1	132.34
	100	1.27	79.59	67.65	81.18	108.24	121.77	135.3
	120	1.32	82.7	70.3	84.36	112.48	126.54	140.6
For z = h:	125	1.33	83.42	70.91	85.09	113.45	127.63	141.81