Uniaxial Compression Behavior of High-Strength Concrete Confined by Low-Volumetric Ratio Lateral Ties

- Journal title : Journal of the Korea Concrete Institute
- Volume 17, Issue 5, 2005, pp.843-852
- Publisher : Korea Concrete Institute
- DOI : 10.4334/JKCI.2005.17.5.843

Title & Authors

Uniaxial Compression Behavior of High-Strength Concrete Confined by Low-Volumetric Ratio Lateral Ties

Hong Ki-Nam; Han Sang-Hoon;

Hong Ki-Nam; Han Sang-Hoon;

Abstract

Presently, test results and stress-strain models for poorly confined high-strength columns, more specifically for columns with a tie volumetric ratio smaller than , are scarce. This paper presents test results loaded in axial direction for square reinforced concrete columns confined by various volumetric ratio lateral ties including low-volumetric ratio. Test variables include concrete compressive strength, tie yield strength, tie arrangement type, and tie volumetric ratio. Local strains measured using strain gages bonded to an acryl rod. For square RC columns confined by lateral ties, the confinement effect was efficiently improved by changing tie arrangement type from Type-A to Type-B. A method to compute the stress in lateral ties at the concrete peak strength and a new stress-strain model for the confined concrete are proposed. Over a wide range of confinement parameters, the model shows good agreement with stress-strain relationships established experimentally.

Keywords

high-strength concrete;column;low-volumetric ratio;localized region length;stress-strain curve;

Language

English

Cited by

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