Strength of circular concrete columns under concentric compression

摘要

An experimental study, in which six columns were loaded concentrically to investigate the behavior of reinforced normal strength and high strength circular columns under concentric compression, is described. The concrete strengths of the columns were 30 MPa and 60 MPa. The primary variables considered were the concrete strength and the amount of transverse reinforcement. Test results indicate that smaller hoop spacing provides higher column capacity and greater strength enhancement in a confined concrete core of columns. For the same lateral confinement, high strength concrete columns develop lower strength enhancement than normal strength concrete columns. Both the strength enhancement ratio (f'_(cc)/f'_(co)) and the column capacity ratio (P_(test)/P_o) were observed to show linear increase variations with ρ_sf_(yt)/f'_c in circular columns.