Numerical analysis of CFRP-confined concrete-filled stainless steel tubular stub columns under axial compression

The carbon fiber-reinforced polymer (CFRP)-confined concrete-filled stainless steel tubular (CFRP-CFSST) column has the superiority in outstanding mechanical properties, corrosion resistance, and low maintenance cost needed throughout its life cycle, and therefore it has a wide application prospect. In order to study the axial compression behavior of CFRP-CFSST stub column, a numerical simulation study based on the previous test was conducted. A finite element model of CFRP-CFSST was developed and the accuracy of the model was verified by the test results of typical failure modes and load-compression curves of specimens. the stress-strain responses and the interaction between different materials, which were difficult to obtain directly during tests, were disclosed through the finite model. The parametric analyses were also conducted for the sake of the effects of stainless steel, CFRP, concrete, diameter-to-thickness ratio, and cross-section area on the mechanical behavior of CFRP-CFSST. Compared the existing ultimate bearing capacity prediction formula, and a reduction factor phi = 0.9 was adopted to the previous formula proposed by Ref. [1] .