# Wind Loads

Theory of wind load

In structural analysis, wind load denotes the force imposed by wind on a structure. Wind load is influenced by factors like height above the ground and velocity. These forces can profoundly impact the stability and structural integrity of structures and buildings. SimSolid plays a crucial role in modeling wind loads on structures by considering key factors such as wind speed, air density, directionality, frictional drag, and shape factor. By incorporating these parameters, SimSolid facilitates the evaluation of pressure exerted on surfaces exposed to the wind, contributing to accurate calculations of structural deflection.

A pivotal influence on wind load considerations is the wind profile. SimSolid supports two distinct profiles: Uniform and Logarithmic. These profiles serve as mathematical models, elucidating the uniform distribution or logarithmic progression of wind speed concerning the height above the ground (H) within the atmospheric boundary layer.

- u
- Shear velocity (Default = ~0.5)
- $\kappa $
- Von Karman constant (Default = ~0.41)
- H
- Height above ground where velocity was measured

- ${P}_{wind}$
- Wind pressure
- ${\rho}_{air}$
- Air density
- V
- Speed of the wind
- C
- Shape factor

For the surfaces which are parallel to the wind direction includes frictional drag ( ${C}_{f}$ ) is calculated by, the following equation.