Flexural behavior of novel marine concrete filled CFRP-aluminum alloy tube member

Abstract

This study proposes a novel marine concrete filled CFRP-aluminum alloy tube (CFRP-CFAT) member for marine engineering. Six specimens including one marine concrete filled aluminum alloy tube (CFAT) and five CFRP-CFAT specimens were tested under uniaxial bending to investigate the flexural behavior of CFRP-CFAT. The effects of CFRP pasting positions, CFRP layers and shear span ratio were investigated. The failure patterns, mid span deflection curves, distribution of the deflection curves, strain, ultimate moment, ductility, flexural stiffness were analyzed. The experiment results illustrate that the failure pattern of CFAT specimen can be improved by CFRP. With the increase in mid-span deflection, the neutral axis shifts towards the compression zone. CFRP enhances the flexural capacity of CFAT specimens, the enhancement of inner CFRP was slightly better. The shear-span ratio does not have a significant impact on the flexural capacity. Compared to CFAT specimens, the use of CFRP leads to a decrease in ductility due to its brittle fracture. Calculation methods for CFRP-CFAT stiffness and bending moment capacity considering the influence of CFRP were proposed.