Abstract

SAUTIE, NELSON; ROMERO MONTEIRO, LEONARDO; CAMANO SCHETTINI, EDITH BEATRIZ  and  PARNAS, VIVIAN ELENA. Determination of the drag and lift coefficients in an equal-leg steel angle section using numerical simulation. Ing. Desarro. [online]. 2020, vol.38, n.1, pp.66-84.  Epub May 30, 2021. ISSN 0122-3461.  https://doi.org/10.14482/inde.38.1.511.8.

Telecommunication towers and other structures composed of steel sections are particularly susceptible to the action of wind loads that need to be quantified for a correct design of these sections. In the obtaining of wind loads, the determination of the drag (CD) and lift (CL) coefficients of the elements that compose the lattice, is vitally important because, from these coefficients, the separation and the permeability of the lattice is estimated the acting wind load. This paper studies the influence of the blockage ratio on the CD and CL coefficients in an equal-leg angle section, widely used in this kind of structure. To obtain these coefficients, computational fluid dynamics (CFD) was used through OpenFOAM software. As part of the experiment, three blockage ratios were simulated: 5, 10 and 20%, using as a comparison pattern the CD and CL values provided by the NBR 6123 1988, NC 285 2003, NBCC 2005 and ASCE 7-10 2010 standards [1]-[4] . The best results were obtained for a 5% blockage.

Keywords : blockage ratio; CFD; drag coefficient; lift coefficient; OpenFOAM.

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