Abstract
Seismic performance evaluation is carried out for reinforced concrete bridge columns using both normal (SD400) and high (SD700) yield strength of reinforcement. A total of 12 column specimens are tested under lateral load reversals. Primary design parameters are types of cross-section, yield strength of both longitudinal and lateral reinforcements, longitudinal reinforcement ratio, and vertical spacing of lateral reinforcement. Lateral force-displacement hysteretic response reveals that experimental lateral forces are well above code-specified lateral forces in overall displacement range. Specimens using SD700 show higher lateral force carrying capacity than those with SD400. On the other hand, specimens using SD400 exhibit more ductile behaviour than those with SD700. Deformation capacity is also investigated in terms of displacement ductility and cumulative energy dissipation. Whereas experimental ductility values are in general greater than code-specified values, margin of safety is slightly reduced as yield strength and longitudinal reinforcement ratio increase. It is thus believed that use of SD700 in reinforced concrete columns seems to be promising.
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