AERODYNAMIC STABILITY OF TWO CABLE-STAYED BRIDGES

The trend in long-span bridge development has been toward increased spans and flexibility and decreased dead weight and damping through use of higher strength materials, refinements in design procedures, and modern fabrication techniques. In some cases, this makes the structure, especially cable-stayed and suspension bridges, sensitive to wind-induced oscillations. Three types of vibrations, namely flexural, torsional (or coupling of the two), and flutter, should be investigated in the design. There is presently no purely analytical or theoretical procedure for the investigation of any of these types of oscillations. Aerodynamic stability information must be obtained from field observations or wind tunnel testing of models. Cable-stayed bridge concepts are receiving popularity in this country. Current cable-stayed designs are subject to the same fundamental wind excitation as the classical suspension bridge; however, the inherent increase in stiffness of the cable-stay box-girder does place it in a different realm of response. With this in mind, several wind tunnel aerodynamic studies have been conducted and recently completed. This paper discusses the results of two such studies. Information is presented regarding vortex shedding response amplitude and acceleration, critical flutter velocity, flutter derivatives, and static force coefficients. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 112-120
  • Monograph Title: Bridge Engineering. Volume 2
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00183787
  • Record Type: Publication
  • ISBN: 0309026970
  • Files: TRIS, TRB
  • Created Date: Dec 12 1978 12:00AM