STRENGTH AND BEHAVIOR OF PRESTRESSED CONCRETE MEMBERS WITH UNBONDED TENDONS

EXPERIMENTAL TEST RESULTS ARE PRESENTED FOR 15 PRESTRESSED CONCRETE MEMBERS WITH UNBONDED TENDONS, UTILIZING TWO SHAPES OF CROSS SECTIONS. RIBBED CROSS SECTIONAL SHAPE WAS USED FOR BEAMS TESTED AS INDETERMINATE TWO-SPAN CONTINUOUS MEMBERS AND AS DETERMINATE DOUBLE CANTILEVER MEMBERS SIMULATING THE NEGATIVE MOMENT REGION OF MULTIPLE SPAN MEMBERS. AN I-SHAPED SECTION WAS USED FOR EIGHT SIMPLY SUPPORTED BEAMS, FOUR OF WHICH WERE SIMPLE BEAMS WITH AN OVERHANG ON ONE END. WEB REINFORCEMENT WAS USED FOR ONLY FOUR OF THE 15 BEAMS TESTED. BONDED REINFORCEMENT WAS INCLUDED IN ALL CASES TO DISTRIBUTE CRACKING IN THE CONCRETE AND TO CONTRIBUTE TO THE ULTIMATE MOMENT CAPACITY AT CRITICAL SECTIONS. DEVELOPMENT OF CRACKING, ULTIMATE LOAD CAPACITY, AND THE LOAD-DEFLECTION RESPONSE WERE OF INTEREST. SOME MEMBERS FAILED IN FLEXURE, WHILE OTHERS FAILED IN SHEAR. THE TEST RESULTS ARE COMPARED WITH VALUES COMPUTED FOLLOWING THE 1963 ACI BUILDING CODE REQUIREMENTS. BOTH FLEXURAL AND SHEAR STRENGTHS AT ULTIMATE ARE UNDERESTIMATED BY THE ACI CODE. THE TRENDS FROM COMPARISONS OF MEASURED TO PREDICTED VALUES ARE DISCUSSED IN THE PAPER FOR BEAMS HAVING THE TWO TYPES OF CROSS SECTIONS, AND OVERALL TRENDS ARE PRESENTED. THE CONTRIBUTION OF THE BONDED DEFORMED BARS TO STRENGTH AND BEHAVIOR OF MEMBERS WITH UNBONDED TENDONS IS DISCUSSED. /AUTHOR/

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  • Supplemental Notes:
    • Vol 12, No 5, PP 15-29, 11 FIG, 6 TAB, 4 REF
  • Authors:
    • Burns, N H
    • Pierce, D M
  • Publication Date: 1967-10

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  • Accession Number: 00208400
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 22 1994 12:00AM