Abstract
Abstract This paper presents the results of a theoretical-experimental study on the aerodynamic behavior of a 150m high, slenderness 30, concrete chimney. For the wind tunnel tests two scaled models were built: one rigid for the measurement of the external pressures, and other aeroelastic, in which the main dynamic characteristics of the real structure were reproduced. The dynamic response under atmospheric turbulence (along-wind direction) is described in the paper and is compatible with the methodology of the Brazilian wind code NBR-6123. A brief analysis of the transversal response due to vortex shedding is presented according to the Canadian Wind Code NBCC. It is observed that, due to the low frequency of the structure, the dynamic approach leads to results significantly larger than those obtained from applying the conventional static approach of gust wind speed. The presence of the neighborhood have increased the loads on the structures.
Highlights
For the proper design of slender chimneys of reinforced concrete is of fundamental importance the correct knowledge of the behavior of the structure under the action of the wind
This occurs in two stages: the first is related to the consideration of the static wind effects on the structure, taking into account the aerodynamic peculiarities of this type of building; the second stage refers to the consideration of the dynamic effects, being the dynamic characteristics of the structure fundamental in determining its response to the wind action
The third and last analysis to be presented considers the chimney with surroundings, with the aerodynamic coefficients obtained in wind tunnel tests
Summary
For the proper design of slender chimneys of reinforced concrete is of fundamental importance the correct knowledge of the behavior of the structure under the action of the wind. The second model (Ruscheweyh, [6]), developed at the University of Aachen, Germany, considers that equivalent forces due to vortex shedding occur at a given correlation length. Both models were used as basis for several normative procedures. They are empirical models and full of inconsistencies, the research in relation to the circular section practically stopped in the last years, being more studied the phenomenon of vortex detachment in structures of square and rectangular section, for presenting a more predictable aerodynamic behavior. Extensive wind tunnel tests were performed, as well as a theoretical analysis with methodologies available in the specialized literature
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