Abstract
The paper presents results of wind tunnel experiments of wind action on two free-standing lighting-protection masts with additional supporting ballast placed on building roofs. Aerodynamic laboratory studies were accomplished in a boundary layer wind tunnel. The main objective of the research was to determine extremal values of aerodynamic coefficients. A cantilevered mast and a tripod mast were tested in different roof conditions and different arrangements with surroundings roof objects. A big influence of aerodynamical interference phenomena between masts and adjacent objects was revealed. Moreover, detailed analysis of the experimental results as well as practical approach to design of such kind of structures with respect to wind action was made.
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