Flexural Behavior of Confined High-Strength Concrete Columns

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Title: Flexural Behavior of Confined High-Strength Concrete Columns

Author(s): Teng-Hooi Tan and Ngoc-Ba Nguyen

Publication: Structural Journal

Volume: 102

Issue: 2

Appears on pages(s): 198-205

Keywords: high-strength concrete; stress; test

Date: 3/1/2005

Abstract:
An experimental investigation of 30 plain and reinforced concrete column specimens with 200 mm square sections is presented. The specimens were tested under different loading schemes: concentric compression, eccentric compression with a fixed neutral axis position, and eccentric compression with a constant eccentricity. The main variables are concrete strength, ranging from 46 to 101 MPa, and confinement reinforcement with a volumetric ratio ranging from 0.7 to 2.4%. A new equivalent rectangular stress block needing only one parameter is proposed. A large volume of published test data with a wide range of concrete strengths was used to examine this rectangular stress block and that of the ACI code. The result shows that this new equivalent rectangular stress block is suitable for both normal- and high-strength concrete.