Experimental and analytical studies of the bond between ribbed CFRP bar and aluminum alloy additional ribs anchorage

Abstract

Though the presence of the novel aluminum alloy additional ribs (ARs) anchorage led to a noticeable bond enhancement for FRP bars embedded in concrete, the interfacial bond between FRP bars and ARs anchorage remained unexplored. In this study, a total of 36 central pullout tests for the bar-ARs anchorage bonded joints were performed. The effects of the anchorage design parameters including the radial deformation, initial thickness, and the extruded length, on the bond performance of the pull-out specimens were identified. Based on the experimental results, the analytical solution for predicting the full-range bond behaviour of the bar-ARs anchorage interface was proposed. The analytical solution was capable of revealing the bond transfer mechanism between FRP bar and ARs anchorage, and its validity was verified with experimental results in terms of both the ultimate pull-out capacity and pull-out load-slip responses.