A STUDY OF I-SECTION PRESTRESSED CONCRETE GIRDERS SUBJECT TO TORSION, SHEAR AND BENDING

AVAILABLE DATA AND THEORIES CONCERNING THE DIAGONAL TENSION CRACKING OF PRESTRESSED CONCRETE MEMBERS SUBJECT TO COMBINED TORSION, SHEAR AND BENDING ARE REVIEWED, AS ARE THOSE CONCERNING THE ULITMATE STRENGTH OF PRESTRESSED CONCRETE MEMBERS SUBJECT TO COMBINED TORSION AND BEDDING. A TWO PART STUDY OF THE BEHAVIOR OF PRESTRESSED CONCRETE I-SECTION GIRDERS IS REPORTED; PART A IS CONCERNED WITH DIAGONAL TENSION CRACKING IN GIRDERS SUBJECT TO COMBINED TORSION, SHEAR, AND MOMENT; PART B IS CONCERNED WITH THE ULTIMATE STRENGTH OF GIRDERS SUBJECT TO COMBINED TORSION AND MOMENT. THE STUDY INVOLVED THE TESTING OF TWENTY FULL-SCALE I- SECTION GIRDERS. THE PRIMARY VARIABLES IN PART A WERE THE RATIO OF TORSION TO SHEAR AND THE SHEAR SPAN; AND IN PART B WERE THE STIRRUP SPACING AND THE AMOUNT OF ADDITIONAL UNPRESTRESSED LONGITUDINAL REINFORCEMENT. PROCEDURES ARE DEVELOPED FOR THE CONSTRUCTION OF TORSION-SHEAR INTERACTION DIAGRAMS FOR DIAGONAL TENSION CRACKING, WHICH REFLECT ACTUAL GIRDER BEHAVIOR WITH REASONABLE ACCURACY. THE PROVISION OF ADDITIONAL LONGITUDINAL REINFORCEMENT WAS FOUND NOT TO INCREASE THE ULTIMATE STRENGTH OF GIRDERS OF THIS TYPE SUBJECT TO COMBINED TORSION AND FLEXURE, DUE TO PREMATURE SPLITTING OF THE OUTSTANDING PARTS OF THE COMPRESSION FLANGE. AT SERVICE LOADS THE TORSIONAL AND FLEXURAL STIFFNESSES OF THE GIRDERS WERE NOT REDUCED BY COMBINED LOADING AND COULD BE CALCULATED WITH REASONABLE ACCURACY USING THE ELASTIC THEORY. /AUTHOR/

  • Supplemental Notes:
    • 100 Pp, 35 FIG, 11 TAB, 25 REF
  • Corporate Authors:

    University of Washington, Seattle

    Seattle, WA  United States  98195
  • Authors:
    • Wyss, A N
    • Mattock, A H
  • Publication Date: 1971-6

Subject/Index Terms

Filing Info

  • Accession Number: 00209514
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 3 1971 12:00AM