TRANSVERSE STEEL CONTENT IN SPIRAL CONCRETE COLUMNS SUBJECT TO ECCENTRIC LOADING

Investigators modify the American Concrete Institute (ACI) Code equation for the ratio of spiral reinforcement to include the level of eccentricity of applied loads. The available ductility of spirally confined reinforced concrete column sections, with a range of longitudinal and transverse steel ratios, strengths of steel and concrete, and also different ratios of eccentricity level-to-section diameter are examined. The method of analysis is based on a theoretical study using a unified stress-strain model for concrete subjected to uniaxial compressive loading and confined by transverse reinforcement. The steel stress-strain model includes strain hardening. Investigators conclude that the current ACI Code requirements for transverse reinforcement are low at high eccentricity levels and high for axially loaded columns. The proposed modification to the ACI equation involves adding a term, a function of the eccentricity-to-column diameter ratio multiplied by the original ACI expression for spiral steel.

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  • English

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Filing Info

  • Accession Number: 00726976
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 26 1996 12:00AM