FLEXURAL STRESS OF CURVED BRIDGE GIRDERS. IN: STRUCTURAL STABILITY RESEARCH COUNCIL. 1990 ANNUAL TECHNICAL SESSION, STABILITY OF BRIDGES, ST. LOUIS, MISSOURI, APRIL 10-11, 1990

This paper presents an analytical study to examine the allowable flexural stresses permitted by the Guide Specifications based on the MSC/NASTRAN QUAD4 finite shell element. According to the current AASHTO Guide Specifications, the allowable flexural stress for curved I-girders is simply given as the allowable stress for a straight girder with equal diaphragm spacing multiplied by curvature reduction factor, p (sub beta) p (sub w). It further limits that the ratio of actual warping stress to bending stress shall be less than or equal to 0.5, the ratio of unbraced compression flange length to flange width shall be less than or equal to 25, and the ratio of the unbraced length to the radius of curvature shall be less than or equal to 0.1. Modeling the isolated curved I-girder between two adjacent diaphragms within the above limitations, almost all cases studied resulted in the inelastic flange buckling range. Therefore, the use of the flexural stress formula in the inelastic range is fully justified and the examination attempted in this study is focused on the curvature reduction factor.

  • Corporate Authors:

    Lehigh University

    Fritz Engineering Laboratory
    Bethlehem, PA  United States  18015
  • Authors:
    • Kang, Y J
    • Yoo, C H
  • Publication Date: 1990

Media Info

  • Features: Figures; References;
  • Pagination: 7 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00612583
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 31 1991 12:00AM