Behavior of Hoop-Confined High-Strength Concrete Under Axial and Shear Loads


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Title: Behavior of Hoop-Confined High-Strength Concrete Under Axial and Shear Loads

Author(s): Hisham AbdelL-Fattah and Shuaib H. Ahmad

Publication: Structural Journal

Volume: 86

Issue: 6

Appears on pages(s): 652-659

Keywords: axial loads; compression; confined concrete; shear stress; high-strength concrete; hoops; stress-strain relationships; Structural Research

Date: 11/1/1989

Thirty-two 3 x 9 in. (76 x 152.4 mm) cylindrical specimens made with high-strength concrete f'c > 6000 psi) were tested under uniaxial compression and combined compression-shear to determine strength and deformation behavior. Eleven specimens were laterally reinforced with thin circular hoops of steel; the rest were plain concrete specimens that were used as controls. Complete stress-strain curves for plain and hoop-confined high-strength concrete under axial compressive stress and combined axial compressive and shear stresses were obtained. The effect of shear stress was to reduce slightly the strength enhancement due to confinement and also to reduce the strain at the maximum strength. The shear stress also reduced the postpeak ductility enhancement due to confinement.