CROSS-SECTION OF A WIDE-SPAN SUSPENSION BRIDGE IN RELATION TO STABILITY PROBLEMS. IN: STRUCTURAL STABILITY RESEARCH COUNCIL. 1990 ANNUAL TECHNICAL SESSION, STABILITY OF BRIDGES, ST. LOUIS, MISSOURI, APRIL 10-11, 1990

This paper shows that for a suspension bridge of span length of around 3000 m or longer, the overall stability of the deck in the horizontal plane becomes a governing factor, so that light decks, as will be suitable for road traffic, are critical under wind or earthquake excitations. In fact in a lateral movement, the main factor toward stability is the pendulum action exerted by the cables and the deck: the higher the weight is, the higher is the restoring force toward the equilibrium position. Although the problem might be identified as a classical stability problem, in practice it appears as a topic of lateral movement under wind excitation. In the presence of an axial compression, the frequency of the natural modes of deflection decreases, and the wind response amplifies. This happens well before the critical value of the compression. The design of the longitudinal restraints of the deck for long span bridges becomes therefore critical. In particular the solution, based on hydrolic dashpots, may be questionable in the presence of seismic action.

  • Corporate Authors:

    Lehigh University

    Fritz Engineering Laboratory
    Bethlehem, PA  United States  18015
  • Authors:
    • CASTELLANI, A
  • Publication Date: 1990

Media Info

  • Features: Figures; Tables;
  • Pagination: 11 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00612580
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 31 1991 12:00AM