Effect of bond on the axial loaded behavior of tubed concrete stub columns

Abstract:

Two groups of specimens including 8 stub columns were tested to study the effect of bond stress between steel tube and core concrete on the axial loaded behavior of tubed high-strength stub columns(HSC).Each group included two columns without bond stress and two columns with bond stress.Elastic-plastic analysis on the steel tube during the loading procedure was carried out.The results from test and analysis indicate that the longitudinal stress of the steel tube is evidently decreased in respect that the bond effect is eliminated,while the bond stress has little effect on the axial load strength and ductility of tubed HSC.Therefore it is not necessary to eliminate the bond effect between the steel tube and the core concrete in structural engineering.