Wind Load CFD Vs Asce7-10
Wind Load CFD Vs Asce7-10
Wind Load CFD Vs Asce7-10
airflow-gif-3.gif1000x800 206 KB
Wind Load Calculation is an overview of the force that blowing wind exerts on a tall object. A
number of factors that influence the actual wind load on a real building, include the surrounding
terrain, nearby structures, trees, and typical weather patterns for the area. Comparing wind load
calculations are most complicated . Calculations try to account for as many of these external
factors as possible, to the point where the wind load section in American Society for Civil
Engineer’s ASCE 7 standard, spans five chapters and over 100 pages.
Input Data−−−−−−−−−−−
F=P⋅A⋅CdP=0.00256⋅V2(1)
F = wind load (in N or lbf)
P = wind pressure (in Pa or psf)
A = projected area (in m2 or ft2)
Cd = drag coefficient (unitless)
V = wind speed
F=P⋅A⋅Cd⋅Kz⋅GKz=(z33)27G=0.65+0.60(h33)17(2)
Kz = exposure coefficient
G = gust response factor
z = height of the midpoint of the object above the ground
h = height of the top of the object above the ground
F=qz⋅G⋅Cf⋅Aqz=0.00256⋅Kz⋅Kzt⋅Kd⋅V2(3)
qz = velocity pressure
G = gust effect factor (as defined in ASCE 7 §26.9)
Cf = force coefficient (as defined in ASCE 7 §29.5)
Kz = velocity pressure coefficient (as defined in ASCE 7 §29.3.1)
Kzt = topographic factor (as defined in ASCE 7 §26.8.2)
Kd = wind directionality factor (as defined in ASCE 7 §26.5)
Purpose−−−−−−−−
The purpose of this project is to validate the results given in the pictures below and to use the
formulas given in the sources. The calculation methods shown can offer a very accurate
simulation of the ultimate wind load on a structure, but they do not offer a complete picture.
They cannot indicate where wind load might be concentrated on a complex structure, nor
simulate the resulting stresses and deflection of the structure. For a more complete
understanding of how a structure will react to high wind loads, an engineer can
use Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) programs to
simulate the interaction of the wind and structure as a whole.
Wind-loads-results.jpg768x447 25 KB
Fig.3 Three wind load calculation methods for three different structures
CFD-towers.jpg1041x300 80.8 KB
Key Words−−−−−−−−−−−
Computational fluid dynamics, CFD, Mathematical models, Wind Load, ASCE 7, Building Load,
American Society of Civil Engineers (ASCE)
Literature & Sources−−−−−−−−−−−−−−−−−−−−−
https://glewengineering.com/wind-load-cfd-modeling/ 3
https://glewengineering.com/comparing-wind-load-calculation-methods/ 2
https://glewengineering.com/wind-load-calculations-modeling/ 2