ABSTRACT
The wind pressures acting on a tall building are very complex. Wind turbulence in the planetary boundary layer is typically expressed by the longitudinal turbulence intensity, which is the ratio of the standard deviation of velocity fluctuations in the mean wind direction to the mean velocity. The resonant component of response is also responsible for wind-induced building acceleration. Cladding is affected primarily by the exterior local wind pressure acting on a small area of the building envelope, such as the area of a single glazing unit or curtain wall panel. The sustained effect of the background load fluctuations on the building is to cause it to move in its natural modes of vibration. In principle, the wind forces on a building depend not only on its shape and the characteristics of the ambient wind flow, but also the building’s acceleration, velocity, and deflection.
