THE EFFECT OF THE METHOD OF TRANSFER ON THE END-ZONE STRESSES AND TRANSMISSION LENGTH IN PRE-TENSIONED CONCRETE MEMBERS

THE PAPER DESCRIBES AND INTERPRETS TESTS CARRIED OUT ON THIRTY-TWO SHORT PRE-TENSIONED UNIFORMLY PRESTRESSED CONCRETE I-BEAMS, USING 0.2 IN DIAMETER INDENTED WIRES. THE OBJECT WAS TO INVESTIGATE THE INFLUENCE OF SUDDEN TRANSFER ON THE TRANSMISSION LENGTH AND ON VERTICAL TENSILE STRESSES WHICH EXIST ON THE END FACE OF THE BEAM AT THE TIME OF TRANSFER OF PRESTRESS TO THE CONCRETE. THESE STRESSES ARE KNOWN TO BE RESPONSIBLE FOR THE HORIZONTAL CRACKING IN THE END ZONES OF THE PRETENSIONED PRESTRESSED BEAMS, NOTICED IN FIELD OBSERVATIONS AND IN MANUFACTURING PLANTS. SUDDEN TRANSFER IS FOUND TO INCREASE THE TRANSMISSION LENGTH OF THE WIRES USED IN THE PRESENT TESTS BY ABOUT TWENTY PER CENT, AND THE VERTICAL TENSILE STRESSES BY ABOUT FORTY PER CENT AS COMPARED WITH THE CORRESPONDING VALUES OBTAINED UNDER CONDITIONS OF GRADUAL TRANSFER. OTHER IMPORTANT FACTORS THAT COULD INFLUENCE THE TRANSMISSION LENGTHS OF VARIOUS TENDONS ARE ALSO DISCUSSED. /TRRL(A)/

  • Availability:
  • Supplemental Notes:
    • VOL 44 NO 3 PP 110-6, 128
  • Authors:
    • Krishnamurthy, D
  • Publication Date: 1970-3

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  • Accession Number: 00208790
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Jun 28 1972 12:00AM