AERODYNAMIC STABILITY ANALYSIS OF CABLE-STAYED BRIDGES

Aerodynamic stability in the design of cable-stayed bridges is an important phase of analysis. Cable-stayed and suspension bridges under wind loading display dynamic behaviors that depend on the aeroelastic forces and coupling among vibration modes. Specifically, new long-span cable-stayed designs can result in behaviors highly dependent on the coupling between distinct modal forms of vibration. This paper describes a finite-element modal formulation to deal wih cable-stayed bridges under laminar wind flow. This numerical model describes aeroelastic forces as functions of the experimentally obtained flutter derivatives, and coupling among various vibration modes can be taken into account easily. The derived equations of motions are computed for a numerical example and the results compared with those obtained from an analytical procedure in which instability is rationally considered to occur in one particular mode.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00714668
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 27 1995 12:00AM