SUSTAINED AND CYCLIC LOADING OF CONCRETE COLUMNS

AN EXPERIMENTAL AND ANALYTICAL STUDY WAS UNDERTAKEN TO DETERMINE THE INFLUENCE OF SUSTAINED AND CYCLIC LOADING ON THE LOAD CAPACITY AND STIFFNESS AND DEFORMATIONAL CHARACTERISTICS OF ECCENTRICALLY LOADED, REINFORCED CONCRETE COLUMNS. THE EXPERIMENTAL LOADING HISTORY CONSISTED OF A SHORT TIME LOADING TO A SERVICE LOAD VALUE, A SUSTAINED SERVICE LOAD OF APPROXIMATELY 4 MONTHS, A PERIOD OF CYCLIC LOADING AT VARIOUS LOAD RANGES ABOVE SERVICE LOAD, AND THEN LOADING TO FAILURE. THE SHORT TIME LOAD CAPACITY OF A COLUMN, AND THE LOAD CAPACITY FOLLOWING THE SUSTAINED LOAD PERIOD WERE OBTAINED FROM A THEORETICAL ANALYSIS. CHANGES IN MEMBER-STIFFNESS AT SERVICE LOAD LEVEL WERE RECORDED DURING THE SUSTAINED AND THE CYCLIC LOADING PERIOD. IT IS CONCLUDED THAT A SUSTAINED SERVICE LOAD DOES NOT SIGNIFICANTLY INFLUENCE THE LOAD CAPACITY FOR THE COLUMNS TESTED. CYCLIC LOADING ABOVE A LOAD OF ABOUT 90%--95% OF THE LOAD CAPACITY JUST PRIOR TO CYCLING MAY INDUCE INCREMENTAL COLLAPSE. CYCLIC LOADING BELOW THIS VALUE DOES NOT APPEAR TO INFLUENCE THE LOAD CAPACITY SIGNIFICANTLY. /ASCE/

• Supplemental Notes:
  • Vol 97, No ST 4, PROC PAPER 8033, PP 1113-1128, 11 FIG,
• Authors:
  • Hellesland, J
  • Green, R
• Publication Date: 1971-4

Media Info

• Serial:
  • Journal of the Structural Division
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Bearing capacity; Concrete; Deformation; Experiments; Loads; Repeated loads; Stiffness
• Uncontrolled Terms: Sustained loading
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209408
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 22 1971 12:00AM