Using CFRP to strengthen concrete-filled steel tubular columns: Stub column tests

Publisher Summary The chapter describes the axial compression test results of concrete-filled steel tubular (CFST) columns with circular and rectangular cross-sections. The test results showed that the carbon-fiber-reinforced polymer (CFRP) jackets can enhance the load bearing capacity of circular columns effectively. However, the enhancement is not significant for rectangular columns as compared to their circular counterparts. A simple model is proposed to calculate the ultimate strength of CFRP-wrapped circular CFST stub columns. The predicted results are in good agreement with the experimental results obtained in the study, as well as those available in literature. Similar to fiber-reinforced polymer (FRP)-confined concrete, sectional shape has a significant influence on the confining effect of FRP jackets. CFRP jackets can enhance the load bearing capacity of the circular CFST columns effectively, but the enhancement is not significant for the rectangular CFST columns.