Title:
Experimental Studies on Confinement Effect of Steel Hoops in Concrete Columns
Author(s):
Wei-Jian Yi, Peng Li, and Sashi K. Kunnath
Publication:
Structural Journal
Volume:
109
Issue:
1
Appears on pages(s):
3-10
Keywords:
axial load; column(s); confinement; ductility; transverse reinforcement
DOI:
10.14359/51683488
Date:
1/1/2012
Abstract:
Four reinforced concrete (RC) frame column specimens without an effective concrete cover were tested under constant axial compressive and cyclic lateral loading. The seismic behavior of the specimens under different loading paths and axial load levels are examined with the objective of understanding the effect of confining action on the column response. The hoop strains of lateral reinforcement at different column heights under cyclic loading were attained by means of eight strain gauges attached along the hoops. Additionally, the characteristics of strain distribution in the transverse reinforcement were investigated. Results of the testing in conjunction with the cyclic stress-strain relationship of steel and the confining stress and its distribution around the cross section were evaluated. Finally, the effect of the confining force of transverse reinforcement on the ductility demand of columns under cyclic loading is highlighted.