Effect of the location and width of CFRP bands on eccentrically compressed CFRP band-confined SSRC columns

Abstract

The effectiveness of FRP in retrofitting/strengthening existing steel reinforced concrete (SRC) structures has been widely recognized. However, investigation on the performance of CFRP band-confined square SRC (CFRPBC-SSRC) columns are still limited. This paper compares the performance of SSRC columns without and with different CFRP bands to examine the effect of the location and width of CFRP bands on the performance of CFRPBC-SSRC. The test results exhibited that SSRC columns obtained a considerable enhancement in the ductility and load-bearing capacity (LBC) by strengthening with CFRP bands. At the same amount of CFRP employed, SSRC columns confined discontinuously with CFRP bands placed in between lateral ties under concentric and eccentric compression obtained higher LBC and ductility than their counterparts confined discontinuously with CFRP bands without taking into account the location of lateral ties. The axial-flexural interaction diagrams of CFRPBC-SRC columns were established based on two codes of FIB-Bulletin-14 and ACI-440.2R-17.

Keywords

• square columns
• discontinuous confinement
• frp confined concrete
• eccentric compression
• strength diagram