ANALYSIS AND CONTROL OF ANCHORAGE - ZONE CRACKING IN PRESTRESSED CONCRETE

THE REPORT PRESENTS THE RESULTS OF AN ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF ANCHORAGE ZONE CRACKING IN PRESTRESSED CONCRETE MEMBERS. SEVERAL ANALYTICAL METHODS ARE REVIEWED AND EVALUATED AND ONE METHOD IS SELECTED FOR COMPARISON WITH TEST RESULTS FROM EXPERIMENTS CONDUCTED IN FOUR SEPARATE LABORATORIES. BOTH PRE-TENSIONED AND POST- TENSIONED MEMBERS WERE TESTED. THE PRIMARY VARIABLES INCLUDED IN THE TEST PROGRAMS WERE: (1) SHAPE OF CROSS SECTION, (2) ECCENTRICITY OF THE PRESTRESSING FORCE, (3) TYPE OF PRESTRESSING, (4) RATIO OF LOADED AREA TO CROSS SECTIONAL AREA, (5) DISTRIBUTION OF THE PRESTRESSING FORCE, (6) CONCRETE QUALITY, (7) TIME-DEPENDENT EFFECTS, AND (8) AMOUNT, LOCATION AND PROPERTIES OF THE TRANSVERSE REINFORCEMENT. A TOTAL OF 177 TESTS WERE ANALYZED. TWO ZONES IN WHICH LONGITUDINAL CRACKING WAS LIKELY TO OCCUR WERE IDENTIFIED. THESE WERE (1) THE BURSTING STRESS ZONE, WHICH LIES ALONG THE AXIS OF THE PRESTRESSING FORCE, AND (2) THE SPALLING STRESS ZONE WHICH IS SOME DISTANCE AWAY FROM THE PRESTRESSING FORCE. THE MEASURED LOADS AT THE INITIATION OF CRACKING IN THE BURSTING AND SPALLING ZONES WERE COMPARED WITH THE CALCULATED VALUES, AND A DESIGN PROCEDURE BASED ON THE ANALYSIS WAS PROPOSED FOR THE CALCULATION OF THE TRANSVERSE STRESSES AND THE SELECTION OF THE TRANSVERSE REINFORCEMENT. TWO NUMERICAL EXAMPLES OF THE DESIGN PROCEDURE ARE INCLUDED IN THE REPORT. /BPR/

  • Supplemental Notes:
    • Hpr-pr-1(3), IHR-10
  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Urbana, IL  USA  61801

    Illinois Department of Transportation

    Division of Highways, 2300 South Dirksen Parkway
    Springfield, IL  USA  62764
  • Authors:
    • Welsh, W A
    • Sozen, M A
  • Publication Date: 1966-6

Subject/Index Terms

Filing Info

  • Accession Number: 00212018
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Oct 13 1994 12:00AM