TESTS OF REPAIRED REINFORCED CONCRETE COLUMNS

AN EXPERIMENTAL STUDY WAS UNDERTAKEN TO DETERMINE THE LOAD-CARRYING CAPACITIES AND DEFLECTION PROPERTIES OF REPAIRED CONCRETE COLUMNS LOADED AT CONSTANT EQUAL END ECCENTRICITIES. THE COLUMNS WERE RECTANGULAR IN SECTION, AND WERE SYMMETRICALLY REINFORCED. THE ORIGINAL LOADING HISTORY OF THE COLUMNS WAS COMPLEX. IT CONSISTED OF APPROXIMATELY 4 MONTHS OF SUSTAINED LOAD FOLLOWED BY A PERIOD OF CYCLIC LOAD AND TERMINATED BY SHORT TIME DEFORMATION CONTROLLED LOADING TO MAXIMUM CAPACITY AND BEYOND. THE REPAIRED COLUMNS WERE LOADED ONLY WITH SHORT-TIME LOADING TO MAXIMUM CAPACITY AND BEYOND, AGAIN USING DEFORMATION CONTROL. REPAIR CONSISTED OF STRAIGHTENING THE COLUMNS, CHIPPING OUT CONCRETE IN ORIGINAL FAILURE ZONE, REPLACING OLD TIES AND ADDING NEW TIES IN THIS ZONE, AND THEN PLACING NEW CONCRETE. THE LOAD CAPACITIES OF THE REPAIRED COLUMNS WERE FOUND TO BE 15 TO 20 PERCENT LESS THAN THE ORIGINAL LOAD CAPACITIES. THE REPAIRED COLUMNS WERE CONSIDERABLY "SOFTER" THAN THE ORIGINAL COLUMNS, WITH LATERAL DEFLECTIONS AT SERVICE LOAD LEVEL VARYING FROM 1.4 TO 3.1 TIMES THE ORIGINAL DEFLECTIONS AT THIS LOAD LEVEL. /AUTHOR/

  • Supplemental Notes:
    • 1 APP
  • Authors:
    • Hellesland, J
    • Green, R
  • Publication Date: 1972-12

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Filing Info

  • Accession Number: 00209971
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 27 1974 12:00AM