SUSTAINED BIAXIAL LOAD ON SLENDER CONCRETE COLUMNS

A METHOD OF ANALYSIS WAS DERIVED TO PREDICT THE BEHAVIOR OF COLUMNS UNDER VARIOUS LOADING CONDITIONS. A MATHEMATICAL MODEL WAS FORMED BY DIVIDING THE COLUMN INTO A NUMBER OF SMALLER ELEMENTS. SHRINKAGE, CREEP, AND STRESS EFFECTS WERE CONSIDERED FOR EACH ELEMENT. A MODIFIED SUPERPOSITION METHOD FOR DETERMINING CREEP UNDER VARYING STRESSES WAS DEVELOPED. TO VERIFY THE METHOD OF ANALYSIS, 64 TESTS WERE PERFORMED ON SLENDER PINNED END COLUMNS. THE COLUMNS HAD A 5-IN. SQUARE CROSS SECTION AND A HEIGHT TO THICKNESS RATIO OF 31. THE EFFECTS OF MAGNITUDE AND ORIENTATION OF THE END ECCENTRICITIES, AND VARIOUS LEVELS OF SUSTAINED LOAD WERE INVESTIGATED. TYPES OF TESTS INCLUDED: SHORT TERM LOAD TO FAILURE, SUSTAINED LOADING TO FAILURE; AND SUSTAINED LOAD FOLLOWED BY SHORT TERM LOADING TO FAILURE. SUSTAINED LOADING WAS CARRIED OUT IN A CONTROLLED ENVIRONMENT. THE DURATIONS OF SUSTAINED LOADING AVERAGED OVER 7 MONTHS WITH A RANGE OF 21 HR TO 2 YR. CLOSE AGREEMENT BETWEEN SIMILAR TESTS AND A GOOD CORRELATION BETWEEN RELATED TESTS WERE OBTAINED. PREDICTED BEHAVIORS COMPARED QUITE WELL WITH THE TEST RESULTS. /ASCE/

• Supplemental Notes:
  • Vol 97, No ST 5, PROC PAPER 8103, PP 1423-1443, 12 FIG,
• Authors:
  • Drysdale, R G
  • Huggins, M W
• Publication Date: 1971-5

Media Info

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

Subject/Index Terms

• TRT Terms: Analysis; Biaxial stress; Columns; Concrete; Creep; Eccentricity; Failure; Loads; Mathematical models; Shrinkage; Stresses; Superposition (Geology)
• Uncontrolled Terms: Loading; Sustained loading
• Old TRIS Terms: Biaxial loads; Superposition
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209446
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 22 1971 12:00AM