Load Fluctuations in Turbulent Flow

Measurements of lift and drag force fluctuations on elementary building shapes in turbulent flow are reported. It is shown that fluctuations in the drag force can be related to the turbulent velocity fluctuations with the use of a simple momentum model. Tests were conducted in a uniform stream, with a relative intensity of turbulence of approximately 10% and a scale of turbulence of the same order as the major dimensions of the models used. The investigation of load fluctuations in turbulent flow was carried out as part of a study directed towards the assessment of wind loads and wind effects on tall buildings.