Analytical behavior of square CFST short beam-columns under sustained load and chloride corrosion

摘要

This paper presents a Finite Element Analytical (FEA) model for square Concrete-Filled Steel Tubular (CFST) short beam-columns (with slenderness ratio λ = 10.4) under combined long-term loading and chloride corrosion. Full-range analysis of square CFST was conducted based on the FEA model. The influence of combined effects of sustained load and chloride corrosion on the bearing capacity and load-displacement relationship of square CFST beam-columns was investigated. The effects of long-term loading effect and corrosion history on the structural behavior were discussed. Furthermore, analysis on the load transfer mechanism and interaction between inner concrete and outer steel tube was conducted to reveal the effects of long-term loading and chloride corrosion on the composite action of square CFST short beam-columns.