Flexural Capacities and Stress Block Parameters for High-Strength Concrete Column
Abstract
Flexural behaviour of reinforced high-strength concrete columns is studied in this paper. Tests of 12 high-strength reinforced
concrete columns under eccentric loading were conducted, with test parameters included the concrete strength, longitudinal
reinforcement ratio, load eccentricities and lateral reinforcement characteristics i.e: spacing and volumetric ratio. Concrete
strength used were around of 50 and 70 MPa. From this study, the main result shows that curvature ductility increase with
increasing volumetric ratio or reduction of tie spacing for lateral reinforcement. Comparison between stress block parameter
models developed by many researchers with the test results was evaluated. It is found that the model adopted in the
Indonesian National Standard (SNI 03-2847-2002) and ACI need to be modified before they can be utilized in the flexural
design of structures made of high-strength concrete.