Civil Engineering Association

Acrosswind Response of Reinforced Concrete Chimneys

The acrosswind response of isolated reinfe~c~d concrete chimneys of circular
cross-section is studied using wind tunnel tests, full-scale measureme,~ts and
response predictions based on semi-empirical methods. Three chimneys with available
full-scale response observations were selected for this study to compare their
measured and predicted responses. The wind tunnel experiments involved measurements
of unsteady aerodynamic loads on rigid models of circular cross-section and
aeroelastic response of scale models of full-scale chimenys. Tests were conducted
initially on smooth surface models, which were repeated with artificially roughened
surface. Attachment of discrete two dimensional surface roughness helps to simulate
artificially flow field features past a cylinder that represent the characteristics of high
Reynolds number flows. Utilizing this roughness configuration permits response
prediction of chimneys in boundary layer wind tunnels with a good agreement with
the observed full-scale response.

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