STRENGTH OF CONCRETE FILLED STEEL COLUMNS

THE ULTIMATE STRENGTH OF AXIALLY AND ECCENTRICALLY LOADED STEEL TUBULAR COLUMNS COVERING A WIDE RANGE OF SLENDERNESS RATIOS WAS INVESTIGATED. HOLLOW STEEL TUBES WERE TESTED AND COMPARED WITH CONCRETE FILLED STEEL TUBES. IT WAS FOUND THAT THE BUCKLING LOAD OF THE AXIALLY LOADED LONG COLUMNS CAN BE ACCURATELY PREDICTED BY SUMMING THE TANGENT MODULUS LOADS FOR THE STEEL TUBE AND THE CONCRETE CORE ACTING AS INDEPENDENT COLUMNS. THE EFFECT OF SLENDERNESS RATIO ON THE LATERAL PRESSURE EXERTED BY THE TUBE ON THE CONCRETE WAS EXAMINED. LATERAL PRESSURE IS EXERTED WHEN THE CONCRETE COMMENCES TO INCREASE IN VOLUME AT HIGH STRAINS AND RESULTS IN AN INCREASE IN STRENGTH OF THE CONCRETE. BUCKLING WILL OCCUR BEFORE THE LONGITUDINAL STRAIN BECOMES SUFFICIENTLY HIGH TO CAUSE THE CONCRETE TO INCREASE IN VOLUME. FOR ECCENTRICALLY LOADED COLUMNS CONSTRUCTED FROM STEEL TUBES INFILLED WITH CONCRETE, IT WAS FOUND THAT A STRAIGHT LINE INTERACTION FORMULA USING THE ULTIMATE AXIAL LOAD AND THE ULTIMATE FLEXURAL CAPACITY OF THE SECTIONS PREDICTED FAILING LOADS. /ASCE/

• Supplemental Notes:
  • Vol 95, No ST 12, PROC PAPER 6936, PP 2565-2587, 7 FIG, 5
• Authors:
  • Knowles, R B
  • Park, R
• Publication Date: 1969-12

Media Info

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

Subject/Index Terms

• TRT Terms: Axial loads; Buckling; Columns; Composite structures; Concrete; Earthwork; Eccentricity; Flexural strength; Loads; Steel; Structural engineering; Thinness; Ultimate strength
• Uncontrolled Terms: Eccentric loading; Lateral pressure; Slenderness ratio
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209131
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 24 1970 12:00AM