Development of work-hardening performance in stainless-steel cylindrical columns by application of CFRP jackets

Recent researches indicated advantageous characteristics for the metallic structural components, strengthened by FRP materials. The current paper examines the load carrying capacity and energy absorption of strengthening stainless-steel cylindrical columns using CFRP jackets. In the experimental program, the circumferentially over-wrapped columns showed considerable development in the work-hardening performance in addition to its maximum load carrying capacity. In the succeeding, a numerical simulation using the FE method was implemented for the further parametric studies. The validation of numerical modeling was primarily carried out with the experimental results. Subsequently, the influence of various lay-up configurations of the FRP jackets was investigated on the response of the strengthened columns. Furthermore, the failure mechanism based on damage criteria in FRP jacket and stainless steel column was studied in details. The main theme of the current work is focused on the interactive mechanical behavior of the metallic column and the composite jacket in the post yield of the nonlinear domain of the stainless-steel column. The results showed the promising influence of the CFRP-strengthening procedure on stainless-steel cylindrical columns under axial compression.