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The two longest cable-stayed bridges in Poland (230 and 250 in main span lengths) have been subjected to the aerodynamic analyses. This paper presents the main topics in these calculation processes: modal analysis, estimation of internal forces generated by the static load action, analysis of vibrations excited by the atmospheric turbulence and feedbacks, determination of bridge vibrations generated by the vortex excitation, calculation of stresses produced with the dynamic wind action. The dynamic structure response was calculated using the quasi-steady method, which allowed the analysis of just a few representative mode shapes, with the result precision acceptable in the engineering practice. Finally, both bridges have been found safe and resistant to the dynamic wind action, however the Warsaw bridge is more susceptible to the aerodynamic influence, especially its deck.
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