FAVORABLE AND UNFAVORABLE EFFECTS OF NON-TENSIONED STEEL IN PRESTRESSED CONCRETE BEAMS

PRESENTED IN THIS REPORT IS A STUDY OF THE EFFECT OF NON- TENSIONED STEEL ON THE BEHAVIOR OF PRESTRESSED CONCRETE BEAMS. A REVIEW OF THE FACTORS THAT INFLUENCE THIS BEHAVIOR UNDER VARIOUS SERVICE CONDITIONS IS MADE, AND THE EFFECT OF NON-TENSIONED STEEL ON THESE FACTORS IS DEMONSTRATED. ANALYTICAL METHODS ARE OUTLINED TO PREDICT SHORT-TIME AND LONG-TIME CAMBER, LOSS OF PRESTRESS FORCE, AND THE REDUCTION OF CONCRETE FORCE IN PRESTRESSED CONCRETE BEAMS CONTAINING NON-TENSIONED STEEL. THE EFFECT OF NON-TENSIONED STEEL ON FIRST CRACKING AND SUBSEQUENT CRACKING IS SHOWN, AND METHODS ARE PRESENTED TO PREDICT DEFLECTIONS OF UNCRACKED AND CRACKED PRESTRESSED CONCRETE BEAMS CONTAINING NON-TENSIONED STEEL. REGARDING THE ULTIMATE STRENGTH OF PRESTRESSED CONCRETE BEAMS CONTAINING NON-TENSIONED STEEL, THE CURRENT PRACTICE AS OUTLINED IN VARIOUS DESIGN SPECIFICATIONS IS REVIEWED. THE METHODS PRESENTED HAVE BEEN APPLIED TO COMPUTE SHORT-TIME AND LONG-TIME CAMBER DEFLECTIONS OF UNCRACKED AND CRACKED SECTIONS, AND ULTIMATE MOMENT OF THE TEST BEAMS. THE AGREEMENT WITH THE OBSERVED RESULTS IS GOOD. A CHAPTER IS DEVOTED TO COMMENTS ON THE PRACTICAL IMPLEMENTATION OF THIS RESEARCH. THE ANALYTICAL METHODS OUTLINED IN THE REPORT ARE APPROXIMATED FOR THE USUAL CONDITIONS OF PRACTICE AND ARE RECOMMENDED FOR DESIGN USE. THE LAST CHAPTER DISCUSSES RECOMMENDATIONS FOR FURTHER RESEARCH IN ORDER TO EXPLORE SOME OF THE ALLIED SUBJECTS TO THIS INVESTIGATION AND ALSO TO PROVIDE A MORE THOROUGH UNDERSTANDING OF THE STATUS OF PARTIALLY PRESTRESSED CONCRETE TECHNOLOGY. /AUTHOR/

  • Supplemental Notes:
    • Hpr-1/4/, HR-123
  • Corporate Authors:

    University of Iowa, Iowa City

    Iowa City, IA  United States  52242
  • Authors:
    • Branson, D E
    • Shaikh, A F
  • Publication Date: 1967-7

Subject/Index Terms

Filing Info

  • Accession Number: 00212021
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Dec 21 1994 12:00AM