COMPARISONS OF VARIOUS METHODS OF CALCULATING THE TORSIONAL INERTIA OF RIGHT VOIDED SLAB BRIDGES

The transverse distributions of the experimental and theoretical deflections and longitudinal moments from nineteen model and one full-size voided slab bridges are compared. The theoretical results are obtained from a load distribution analysis which dies not include shear deformation effects, and the torsional inertia used to calculate the torsional parameter is calculated by various methods. It is recommended that the torsional parameter should be calculated ignoring the contribuiton of the poisson effect and that the torsional inertia should be calculated by considering the flanges of the section to be a pair of coupled laminae. A simplified approach, which give reasonable correlation with the data for experimental deflection and longitudinal moment, is to assume that the torsional parameter of all voided slab bridges is equal to 0.8. Insufficient experimental data are available to make any definite recommendations regarding transverse effects, although these are discussed.

  • Corporate Authors:

    Cement and Concrete Association

    52 Grosvenor Gardens
    London SW1W 0AQ,   England 
  • Authors:
    • CLARK, L A
  • Publication Date: 1975-6

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 34 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00129354
  • Record Type: Publication
  • Report/Paper Numbers: 42508 Tech. Rpt.
  • Files: TRIS
  • Created Date: Mar 10 1976 12:00AM