The influence of the structural vibrations’ logarithmic decrement on its stability in the event of vortex excitation

Abstract

Abstract The article considers the influence of the structural vibrations’ logarithmic decrement on its stability in the event of vortex excitation. The relevance of the topic is due to the widespread problem of vortex excitation in the construction and operation of large-span bridge structures. The introduction presents the characteristic features of vortex excitation as a phenomenon of aerodynamic instability. In the second section, the research method is given, the research object is described, and the considered variants of the logarithmic decrement of the beam span’s investigated construction vibrations are given. The third section presents the experimental studies’ results at the Unique Scientific Installation, Big Research Gradient Wind Tunnel, NRU MGSU in graphical form. The conclusions about increasing the structural stability with increasing values of the vibrations’ logarithmic decrement are drawn.