ULTIMATE FLEXURAL BOND IN BEAMS PRE-TENSIONED WITH HIGH- STRENGTH STRAND

THE BOND CHARACTERISTICS OF 1/2-IN. 270 K PRESTRESSING STRAND WERE INVESTIGATED TO DETERMINE THE EFFECT OF EMBEDMENT LENGTH ON THE AXIAL STRESS NECESSARY TO PRODUCE GENERAL BOND SLIP. THE PRINCIPAL VARIABLE WAS THE EMBEDMENT LENGTH OF THE STRAND. THE RESULTS OF THIRTEEN TESTS CONDUCTED ON TWELVE BEAMS PRE-TENSIONED WITH 1/2-IN. 270 K STRAND ARE PRESENTED AND COMPARED WITH THE TEST RESULTS OBTAINED IN TESTS CONDUCTED ON BEAMS PRE-TENSIONED WITH 1/2- IN. CONVENTIONAL STRAND. THE OBSERVED CRITICAL LENGTH FOR THE 1/2-IN. 270 K STRAND WAS FOUND TO BE 80 INCHES, AS COMPARED WITH 135 INCHES FOR THE CONVENTIONAL STRAND. IN GENERAL, IT WAS FOUND THAT HIGHER STRESSES WERE REQUIRED TO CAUSE GENERAL BOND SLIP WITH THE 270 K STRAND, THAN WITH THE CONVENTIONAL STRAND. AN ANALYTICAL CONCEPT HAS BEEN DEVELOPED, BUT A COMPARISON WITH THE EXPERIMENTAL RESULTS IS NOT INCLUDED, MAINLY DUE TO THE LACK OF SUFFICIENT INFORMATION ON THE DEVELOPMENT OF FRICTION, MECHANICAL ACTION, AND THE COEFFICIENT OF CREEP IN CONCRETE.

• Corporate Authors:

  Lehigh University

  Bethlehem, PA  United States  18015
• Authors:
  • Badaliance, R
  • Van, HORN DA
• Publication Date: 1966-2

Subject/Index Terms

• TRT Terms: Alternatives analysis; Anchoring; Axial loads; Beams; Bond strength (Materials); Bonding; Concrete; Design; Flexural strength; High strength steel; Laboratory tests; Length; Pretensioning; Testing
• Uncontrolled Terms: Axial stress; Concrete beams; Design criteria
• Old TRIS Terms: Embedments (Concrete); Flexural bond
• Subject Areas: Bridges and other structures; Design; Highways;

Filing Info

• Accession Number: 00207784
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS
• Created Date: May 1 1994 12:00AM