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
Structure 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
Height of structure
Structure Width, B
Structure Length, L
Damping Ratio, β
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.
Period Coefficient, Ct =
Suggested range = 0.020-0.035
Wind and site properties
Wind Speed, V
Topographic Factor, Kzt
Directionality Factor, Kd
Gust Effect Factor, G
If f>=1, it is a rigid structure
Simplified Gust Factor, G for rigid structure
Calculated Gust Factor, G for rigid structure
Calculated Gust Factor, G for flexible structure
Chosen Gust Factor, G
⬆️ Design wind load pressures, p
Net design wind pressures, p for open structures for varying values of the Force Coefficient, Cf = 1.2, 1.6, 1.8 and 2.0.