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Wind Tunnel Testing of High-Rise Buildings by David Scott, Roy Denoon, Peter Irwin

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2.0 Nature of Wind Effects

2.1 Planetary Boundary Layer and Wind Turbulence

The wind pressures acting on a tall building are very complex. While they clearly depend on the shape of the building itself, they also depend on the wind shear and turbulence caused by the roughness of the upwind terrain and the building’s aerodynamic interaction with other nearby buildings. The earth’s terrain roughness slows the wind near the ground, thus giving rise to the planetary boundary layer, within which the wind velocity increases with height (i.e., there is wind shear). Within this boundary layer the wind is also highly turbulent. The thickness of the planetary boundary layer can vary considerably, but at high wind speeds in synoptic storms it is typically ...

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