Finite element simulation of load bearing capacity of circular CFST long columns with localized corrosion under eccentric load

Abstract

In order to study the influence of local corrosion on the load-bearing capacity of circular concrete filled steel tube (CFST) long columns under eccentric compression, a numerical model was established by using the commercial finite element software ABAQUS. The influence of corrosion site, corrosion volume rate and corrosion area rate on the whole process of load and deformation was discussed, and the sensitivity analysis of the steel strength, concrete strength, eccentricity, steel tube wall thickness and slenderness ratio was performed. It was show that corrosion site and corrosion volume rate have greater impact on ultimate load bearing capacity of circular CFST long columns with localized corrosion, but corrosion area rate has less impact. Under the same corrosion volume rate, the load bearing capacity of CFST columns with localized corrosion at both ends is greater than that at one end which is greater than that at the middle segment. Steel strength, concrete strength, eccentricity, steel tube wall thickness and slenderness ratio can all affect the bearing capacity of the column and corrosion can further degrade it.