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Abstract. This paper concerns analysis of turbulent wind action on a single-span footbridge. Firstly, the issue of the velocity wind field in the boundary layer was mentioned. Then the simplified quasi-steady model of the wind action on a slender object was presented. Procedure of simulation of turbulent wind action was also shown. The specific case without aerodynamic feedback was considered on the exemplary footbridge. Analysis of such action in numerical program was shown as well as the evaluation of its results.

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This papers concerns measurements of wind pressure distributions on the roofs and side walls of tent hall models. Four tent halls of different shapes and constructions were investigated in the boundary layer wind tunnel at Cracow University of Technology, Poland. On the basis of these measurements, different schemes of wind pressure coefficient distributions for these structures were determined, including mean and extreme values of the coefficients. The obtained results, their analyses and comparisons are of great importance from a structural design point of view for such types of structures.

The paper presents results of wind tunnel experiments of wind action on two free-standing lighting protection masts: cantilevered and tripod. Own similarity criteria concerning phenomenon of global stability loss were used in these tests. It was determined whether masts fulfill the requirements of overturning and shift global stability in range of base wind velocities adequate for Poland and different categories of terrain roughness according to the Eurocode [13]. Two possible forms of the loss of the global stability of lighting protection masts in strong wind were considered: overturning a mast and shifting of mast as a whole structures. The measurements were conducted for eight directions of wind attack, five positions of masts on the roof, two settings of the mast for tripod mast and one for cantilevered mast, two categories of terrain roughness. Conducted tests allowed to determine whether it is safe to locate tripod mast in all wind zones in Poland. Cantilevered mast can be located safely in I and II wind zone in Poland.