EFFECT OF YIELD STRENGTH RATIO OF LONGITUDINAL REINFORCING BARS ON DEFOMABILITY OF REINFORCED CONCRETE MEMBERS

Abstract

The objective of this research is to investigate the post-yield performance of a plastic hinge in a reinforced concrete using longitudinal reinforcing bars with high yield strength ratio. Three 1/2 scale reinforced concrete cantilever beam specimens were subjected to statically cyclic load with increasing amplitude to failure. Variables in the test were (1) yield strength ratio of longitudinal reinforcing bars and (2) with or without reinforcing bar couplers at the critical section. Test results showed that (1) longitudinal reinforcing bars with 90% yield strength ratio ruptured at critical section at the deflection angle of 1/20, due to the concentration of strain within its small hinge region and that (2) concentration of strain at critical section was not accelerated due to the couplers.