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  1. 2 Czasopismo Techniczne

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  1. 2 2016

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  1. 2 Lipecki T.

  2. 1 Bęc J.

  3. 1 Jamińska P.

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The relationship between wind pressure on the surface of rectangular prisms and atmospheric boundary layer parameters

100%
Lipecki T.
Czasopismo Techniczne
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PL
This paper considers the dependence of pressure fields on surfaces of rectangular prisms obtained from wind tunnel experiments on boundary layer characteristics. Six different variants of boundary layer flows were simulated in the wind tunnel. The qualitative coefficients of correlation Rs between the wind pressure coefficient Cp or its standard deviation σp and parameters describing boundary layer flows (wind speed profile, turbulence intensity profile, power spectral density) were estimated in order to determine how wind parameters influence surface pressure. Five rectangular prisms were placed in the wind tunnel. The following ratios of prism dimensions were adopted: D/B/H = 1:2:20 (R5); 1:2:10 (R3); 1:2:5 (R1); 1:4:20 (R4); 1:4:10 (R2).
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A comparative study of along-wind and crosswind responses of steel chimneys according to Polish and Eurocode standards

51%
Lipecki T., Bęc J., Jamińska P.
Czasopismo Techniczne
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PL
An analysis of the response of steel chimneys to wind action is presented in this paper. The approaches presented in the Polish standards and in Eurocode 1 referring to steel chimneys and wind action are shown here. Comparisons of along-wind and crosswind action according to these procedures are made. Responses to the wind action, i.e. displacements of the top of each chimney, are compared. Real chimneys were analyzed. In almost every case, significant vibrations due to vortex excitation was observed. Structural data was obtained from the literature. All chimneys and wind actions were modelled in FEM system – Autodesk Mechanical Simulation 2013. Very significant differences of the crosswind response were observed when analyzing two approaches proposed by Eurocode. Lateral displacements were larger than longitudinal displacements in many analyzed cases.
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