STATIC AND FATIGUE STRENGTHS OF BEAMS CONTAINING PRESTRESSED CONCRETE TENSION ELEMENTS

THE STATIC AND FATIGUE BEHAVIOR OF COMPOSITE BEAMS CONTAINING 2 IN SQUARE PRECAST TENSION ELEMENT, CONCENTRICALLY PRESTRESSED WITH A SINGLE 7/16 IN DIAMETER 7-WIRE STAND IS PRESENTED. THE ELEMENT WAS POSITIONED IN THE BEAM OF 6 IN WIDE, 9 IN DEEP AND 120 IN LONG, SUCH THAT ITS CONTROID WAS 2 IN FROM THE TENSION FACE. TWO STATIC TESTS WERE CONDUCTED TO OBTAIN THE ELASTIC AND INELASTIC LOAD-DEFLECTION BEHAVIOR OF THE COMPOSITE MEMBER AND TO DETERMINE THE LOAD P SUB CR CORRESPONDING TO INITIAL CRACKING IN THE TENSION ELEMENT, AND P SUB U, THE ULTIMATE LOAD. REPEATED LOAD TESTS WERE CONDUCTED ON SEVENTEEN BEAMS. THE PRINCIPAL OBJECTIVE WAS TO DETERMINE THE BEHAVIOR OF THE TENSION ELEMENT UNDER CONDITIONS THAT SIMULATED THOSE AT A CONTINUITY CONNECTION IN A HIGHWAY BRIDGE; AND IN PARTICULAR TO ASCERTAIN THE FATIGUE STRENGTH OF THE TENSION ELEMENT. THE SCOPE OF THIS INVESTIGATION WAS LIMITED TO THE APPLICATION OF REPEATED LOADS OVER A RANGE OF 0.5 P SUB CR TO 2 P SUB CR. TEST RESULTS CLEARLY INDICATE THAT THE MAGNITUDE OF THE PEAK LOAD DETERMINES THE MODE OF FAILURE. RESULTS REVEALED THAT USE OF THE TENSION ELEMENT FOR CONTINUITY CONNECTION CREATES A SECTION THAT IS SUPERIOR TO ONE USING CONVENTIONAL REINFORCEMENT, SINCE IT INCREASES THE CRACKING LOAD OF THE SECTION BY 52% AND THUS PROVIDES BETTER PROTECTION OF THE REINFORCEMENT AGAINST CORROSION. /AUTHOR/

  • Supplemental Notes:
    • Final ReporT, 80 PP, 36 FIG, 8 TAB, PHOTS, 26 REF, 4 APP
  • Corporate Authors:

    North Carolina State University, Raleigh

    Raleigh, NC  United States  27695
  • Authors:
    • Mirza, J F
    • Zia, P
    • Bhargava, J R
  • Publication Date: 1970-1

Subject/Index Terms

Filing Info

  • Accession Number: 00209557
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 1 1971 12:00AM