END SUPPORT EFFECTS ON ULTIMATE FLEXURAL BOND IN PRE- TENSIONED BEAMS

THIS INVESTIGATION IS A PILOT STUDY OF THE BOND CHARACTERISTICS OF PRESTRESSED MEMBERS PRE-TENSIONED WITH MULTIPLE LAYERS OF STRAND. THE PRIMARY OBJECTIVE WAS TO DEVELOP INFORMATION IN REGARD TO THE ADDITIONAL FLEXURAL BOND ATTAINED IN STRANDS FOUND NEAR THE LOWER EXTREMITY OF PRE-TENSIONED MEMBERS AS A RESULT OF THE PINCHING EFFECT OF THE END REACTIONS. THE RESULTS OF TESTS CONDUCTED ON THREE BEAMS PRE-TENSIONED WITH TWO LAYERS OF 1/2-IN., 270K STRAND ARE PRESENTED AND COMPARED WITH SIMILAR FLEXURAL BOND TESTS BY BADALIANCE AND VANHORN ON BEAMS WITH A SINGLE-LAYER STRAND PATTERN. THE TEST RESULTS CLEARLY INDICATE THAT ADDITIONAL FLEXURAL BOND IS DEVELOPED AS A RESULT OF THE PINCHING EFFECT OF THE END REACTION ON THE PRESTRESSING STEEL NEAR THE SOFFIT OF THE MEMBER. THE STUDY ALSO DEMONSTRATED THAT BOND SLIP OCCURRED AT LOADS WHICH WERE CONSIDERABLY BELOW BOTH THE ACTUAL AND THE COMPUTED ULTIMATE FLEXURAL CAPACITIES OF THE MEMBERS. /AUTHOR/

• Supplemental Notes:
  • Hpr-1/3/, 364
• Corporate Authors:

  Lehigh University

  Bethlehem, PA  United States  18015

  Pennsylvania Department of Highways

  400 North Street
  Harrisburg, PA  United States  17120-0095
• Authors:
  • Cowen, S H
  • VanHorn, D A
• Publication Date: 1967-1

Subject/Index Terms

• TRT Terms: Beams; Flexural strength; Prestressing; Pretensioning; Steel structures; Structural analysis; Structural supports; Testing
• Old TRIS Terms: End supports; Flexural bond; Prestressed beams; Supports
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00207828
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS
• Created Date: May 18 1994 12:00AM