LONG-SPAN PRECAST PRESTRESSED CONCRETE BRIDGES BUILT IN CANTILEVER

THE EVOLUTION OF CANTILEVER SEGMENTAL CONSTRUCTION, ITS FIRST APPLICATIONS AND SUCCESSIVE IMPROVEMENTS ARE SURVEYED. DETAILS ARE GIVEN OF THE CONSTRUCTION METHOD. PRESTRESSING IS APPLIED AFTER EACH SYMMETRICAL PAIR OF SEGMENTS IS PLACED IN POSITION. AS THE SEMISPANS FROM ADJACENT PIERS COME TOGETHER, THE CENTER OF THE SPAN IS CLOSED BY INSERTING A DROP-IN GIRDER SEGMENT, AND CINTINUITY IS PROVIDED BY EPOXY CEMENT, MORTAR AND STRESSED TENDONS. CONTINOUS SPANS MINIMIZE THE DEFLECTIONS AND ANGULAR BREAK THAT WOULD BE CAUSED IN A HINGED DECK BY CREEP RELAXATION, SHRINKAGE, LIVE LOAD, AND DEVIATIONS IN MATERIAL PROPERTIES. CAREFUL APPLICATION OF PRESTRESSING STEEL IS NECESSARY IN CONTINUOUS BRIDGES, HOWEVER, TO TAKE CARE OF MOMENT REVERSALS AND TO ACHIEVE OPTIMUM STRESS DISTRIBUTION. IN LONG DECKS, EXPANSION JOINTS ARE PROVIDED PREFERABLY AT POINTS OF CONTRAFLEXURE TO MINIMIZE DEFLECTION. SEVERAL BRIDGE PROJECTS UTILIZING DIFFERENT PRECASTING AND ERECTION TECHNIQUES ARE DESCRIBED, AND TYPICAL COSTS ARE TABULATED. /RRL/

  • Supplemental Notes:
    • No 23, pp 705-740, 6 FIG, 4 TAB, 21 PHOT
  • Corporate Authors:

    Intl Symp Concr Bridge Des Proc /Can

    ,    
  • Authors:
    • Muller, J
  • Publication Date: 1969

Subject/Index Terms

Filing Info

  • Accession Number: 00215059
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Nov 18 1970 12:00AM