Cyclic Behavior of a Reinforced Concrete Column with Unstressed Seven-Wire Steel Strands as Longitudinal Reinforcement

摘要

The use of unstressed Grade 1860 (MPa) seven-wire steel strands as longitudinal reinforcement in columns has the advantage of reducing the cost of steel as compared with conventional Grade 420 (MPa) deformed steel bars. A preliminary experimental study was conducted to investigate the performance of a column with unstressed seven-wire strands as longitudinal reinforcement. Large-scale column specimens were designed and tested using double-curvature lateral cyclic loading under a constant axial load. Test results showed that the column with strands as longitudinal reinforcement (RH1) showed less and wider cracks and less energy dissipation than the column with deformed bars as longitudinal reinforcement (ORH1). Despite this. RH 1 showed a slightly higher dri ft capacity than ORH1 even when the strands used in RH1 had a much lower ultimate strain than the deformed bars used in ORH 1.