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CONSTRUCTION AND LONG-TERM BEHAVIOR OF 1/8-TH SCALE PRESTRESSED CONCRETE BRIDGE COMPONENTS

THE CONSTRUCTION AND OBSERVED LONG-TERM BEHAVIOR OF TWO SIMPLY SUPPORTED AND TWO THREE-SPAN CONTINUOUS COMPOSITE PRESTRESSED CONCRETE BEAMS ARE DESCRIBED. THE PRECAST, PRETENSIONED GIRDERS, 6 IN. DEEP BY 9 FT LONG, WERE 1/8-TH SCALE MODELS OF GIRDERS FROM A STRUCTURE BEING STUDIED IN THE FIELD. THE TWO THREE-SPAN STRUCTURES, REPRESENTING INTERIOR LINES OF BEAMS FROM THE PROTOTYPE STRUCTURE, WERE EACH MADE WITH THREE SIMPLY SUPPORTED GIRDERS WHICH WERE MADE CONTINUOUS FOR LIVE LOAD EFFECTS BY MEANS OF REINFORCEMENT IN THE CAST-IN-PLACE DECK AND BY CONCRETE IN THE PIER DIAPHRAGM. THE EFFECTS OF CONTINUITY IN REDUCING THE LONG-TERM DEFORMATIONS OCCURING AFTER THE DECK CONCRETE WAS CAST WERE STRIKINGLY SHOWN, AND IT WAS FOUND THAT A SIMPLE ELASTIC ANALYSIS COULD SATISFACTORILY PREDICT THE RELATIVE MAGNITUDES AND DIRECTIONS OF THE DEFORMATIONS OCCURRING AFTER THE DECK CONCRETE HAD HARDENED. CREEP AND SHRINKAGE DATA FOR THE CONCRETES USED IN THE STRUCTURES IS REPORTED. IT WAS FOUND THAT THE SMALL SIZE OF THE SPECIMENS LED TO LARGE CREEP AND SHRINKAGE STRAIN VALUES, AS WAS EXPECTED. HOWEVER, IT WAS ALSO FOUND THAT THE STRAIN PREDICTION METHODS BASED ON VOLUME-SURFACE RATIO EFFECTS COULD NOT BE INDISCRIMINATELY EXTENDED TO VERY THIN SPECIMENS AND MEMBERS.

  • Supplemental Notes:
    • Contract IHR-93 Rept No UILU-ENG-72-2013
  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Urbana, IL  United States  61801
  • Authors:
    • Anderson, T C
    • Houdeshell, D M
    • Gamble, W L
  • Publication Date: 1972-10

Media Info

  • Pagination: 106 p.
  • Serial:
    • Issue Number: N284

Subject/Index Terms

Filing Info

  • Accession Number: 00216003
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Files: TRIS, USDOT
  • Created Date: Apr 27 1974 12:00AM