SERVICEABILITY CRITERIA FOR PRESTRESSED CONCRETE BRIDGE GIRDERS

Serviceability limit states often govern in the design of prestressed concrete bridge girders, yet the corresponding acceptability criteria are not clearly justified. The paper deals with allowable stresses and ultimate moment. The requirements of the AASHTO standard specifications are demonstrated on pretensioned bridge girders AASHTO Types III through VI. Moments are calculated for the considered limit states and for various spans. It is observed that the ratio of these moments varies with regard to span length. In most cases, the final tension stress (after the final loss of prestress) determines the minimum required number of prestressing strands. On the other hand, the important limit state is compression stress in concrete, as overloading may lead to unacceptable permanent deformations. Revision of the serviceability limit states, consistent in format with the new AASHTO load and resistance factor design specifications, is suggested. The formulation of a compression limit state in concrete that is based on the elastic limit and tension limit states in concrete and the modulus of rupture is proposed.

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 181-187
  • Monograph Title: FOURTH INTERNATIONAL BRIDGE ENGINEERING CONFERENCE, SAN FRANCISCO, CALIFORNIA, AUGUST 28-30, 1995. CONFERENCE PROCEEDINGS, 2 VOLUMES
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00711723
  • Record Type: Publication
  • ISBN: 0309061091
  • Files: TRIS, TRB
  • Created Date: Sep 6 1995 12:00AM